atcoder.jp - dns.ninja

`atcoder.jp`

DNSSEC	⚠️ Not signed
A	13.226.209.19^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
		PTR	`server-13-226-209-19.iad61.r.cloudfront.net`
A	13.226.209.24^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
A	13.226.209.57^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
A	13.226.209.113^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
NS	`ns-96.awsdns-12.com` ⭐
		A	2600:9000:5300:6000::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-96.awsdns-12.com`
		A	205.251.192.96^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-96.awsdns-12.com`
NS	`ns-1144.awsdns-15.org`
		A	2600:9000:5304:7800::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1144.awsdns-15.org`
		A	205.251.196.120^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1144.awsdns-15.org`
NS	`ns-1543.awsdns-00.co.uk`
		A	2600:9000:5306:700::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1543.awsdns-00.co.uk`
		A	205.251.198.7^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1543.awsdns-00.co.uk`
NS	`ns-890.awsdns-47.net`
		A	2600:9000:5303:7a00::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-890.awsdns-47.net`
		A	205.251.195.122^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-890.awsdns-47.net`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c1b::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`wv-in-f26.1e100.net`
		A	142.250.31.26^{🇺🇸 Google142.250.31.0/24}
			PTR	`bj-in-f26.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽²⁰⁾
		A	2800:3f0:4003:c0f::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.27^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f27.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽²⁰⁾
		A	2a00:1450:400b:c02::1b^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f27.1e100.net`
		A	172.253.116.27^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f27.1e100.net`
MX	`aspmx2.googlemail.com`⁽³⁰⁾
		A	2800:3f0:4003:c0f::1a^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.26^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f26.1e100.net`
MX	`aspmx3.googlemail.com`⁽³⁰⁾
		A	2a00:1450:400b:c02::1b^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f27.1e100.net`
		A	172.253.116.27^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f27.1e100.net`
MX	`aspmx4.googlemail.com`⁽³⁰⁾
		A	2a00:1450:4009:c0f::1b^{🇬🇧 Google2a00:1450:4009::/48}
			PTR	`yulhrs-in-f27.1e100.net`
		A	192.178.223.27^{🇺🇸 Google192.178.223.0/24}
			PTR	`yulhrs-in-f27.1e100.net`
MX	`aspmx5.googlemail.com`⁽³⁰⁾
		A	2a00:1450:400c:c23::1a^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`yubrupd-in-f26.1e100.net`
		A	172.253.157.26^{🇺🇸 Google172.253.0.0/16}
			PTR	`yubrupd-in-f26.1e100.net`
TXT	`1password-site-verification=H3CJM364F5GI5P3VXH2PYFGCKI`
TXT	`MS=ms90685883`
TXT	`cloudflare_dashboard_sso=f62aac0af9122a7fff211950f317b6df`
TXT	`google-site-verification=IIyyB5yMWakA7SnvZLuqk-eBDlEj647aY0Rq-c80uIg`
TXT	`google-site-verification=iiXXCv8YJjdE0FWPz6zq0ispBt688ytJaOQfOpwuU3A`
TXT	`pardot884953=58ccd91e72a6f94be7450fef89ee32f712f9e18afb5273954e7d09781c220ec1`
TXT	`stripe-verification=e726551d53f6bea6b1a960e876e9fd88c34f32b723a3b2ecb1a91dfc3...`
TXT	`v=spf1 a:atcoder.jp include:_spf.google.com include:aspmx.pardot.com include:...`
SOA	`ns-96.awsdns-12.com`awsdns-hostmaster@amazon.com serial=1

`jp`

	DNSSEC	🔒 Signed (DS record present)
	NS	`z.dns.jp` ⭐
	NS	`a.dns.jp`
	NS	`b.dns.jp`
	NS	`c.dns.jp`
	NS	`d.dns.jp`
	NS	`e.dns.jp`
	NS	`f.dns.jp`
	NS	`g.dns.jp`
	NS	`h.dns.jp`
	SOA	`z.dns.jp`root@dns.jp serial=1781703902

rank #49926 globally
rank #1029 in the tld
📈 Tranco rank: #39,956

Subdomains

info.atcoder.jp

img.atcoder.jp

past.atcoder.jp

Same first word

atcoder.co.jp

atcoder.org

atcoder.jp

atcoder.biz

atcoder.info

Similar names

teradoc.fr

artdeco.store

dotcaer.com

redcoat.ai

decoart.at

codeart.co.uk

dotcrea.net

roadtec.com.uy

artdeco.se

codetra.com

codeart.pl

rodatec.com

artedoc.nl

artdeco.hk

artcode.in

artcode.com.au

teraodc.com

artdeco.ch

daocert.com

artdeco.info

artdeco.cz

artdeco.de

artdeco.ca

artedco.com

cartedo.com

codeart.us

decoart.es

octaedr.info

docrate.com

tradeco.online

tradeco.pro

artcode.ltd

redcoat.de

decoart.fi

cadoret.com

coredat.at

cordate.tw

artcode.co.uk

artcode.by

cortade.net

codeart.co.il

caterdo.com

credota.live

redcoat.biz

tradeco.ca

coredat.net

doreact.com

cotrade.cn

artcode.co.jp

cotarde.com

redcoat.eu

artdeco.at

cardeto.it

artdeco.org.au

artcode.com

tradeco.cz

roadtec.com

doratec.ch

decoart.co.uk

roadtec.com.ua

teradoc.com

cotrade.co

redacto.org

ardotec.com

coredat.com

doctera.com

decorat.ru

codeart.vn

tedraco.com

ecotrad.org

decarto.com

deactro.nl

decorat.com

doecart.com

decoart.fr

decoart.to

tradeco.com.vn

tarcode.ru

decoart.online

decorat.com.mx

cadoret.fr

treadco.com

codeart.com.au

decotra.com

cadoret.myshopify.com

artcode.com.ua

tadecor.vn

roadtec.net

cotrade.de

cardeto.org

artdeco.nl

artecod.net

dertaco.net

artcode.eu

cotrade.it

ecotrad.it

artdeco.diamonds

cadoret.ca

decoart.ru

DNS History

69 records (15 active, 54 former)

●NSns-1144.awsdns-15.org2017-05-24 → 2026-06-17 · 3 obs

○ 2016-07-16 04:50:00
● 2017-05-24 06:16:14
● 2026-06-17 14:01:42

●NSns-1543.awsdns-00.co.uk2017-05-24 → 2026-06-17 · 3 obs

○ 2016-07-16 04:50:00
● 2017-05-24 06:16:14
● 2026-06-17 14:01:42

●NSns-890.awsdns-47.net2017-05-24 → 2026-06-17 · 3 obs

○ 2016-07-16 04:50:00
● 2017-05-24 06:16:14
● 2026-06-17 14:01:42

●NSns-96.awsdns-12.com2017-05-24 → 2026-06-17 · 3 obs

○ 2016-07-16 04:50:00
● 2017-05-24 06:16:14
● 2026-06-17 14:01:42

○NSns1.value-domain.com2015-08-13 → 2016-07-16 · 4 obs

● 2015-08-13 18:44:32
● 2016-07-16 04:50:00
○ 2017-05-24 06:16:14
○ 2026-06-17 14:01:42

○NSns2.value-domain.com2015-08-13 → 2016-07-16 · 4 obs

● 2015-08-13 18:44:32
● 2016-07-16 04:50:00
○ 2017-05-24 06:16:14
○ 2026-06-17 14:01:42

●MXalt1.aspmx.l.google.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

●MXalt2.aspmx.l.google.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

●MXaspmx.l.google.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

●MXaspmx2.googlemail.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

●MXaspmx3.googlemail.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

●MXaspmx4.googlemail.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

●MXaspmx5.googlemail.com2015-08-13 → 2026-06-17 · 2 obs

● 2015-08-13 18:44:32
● 2026-06-17 14:01:42

○A108.156.85.1092026-03-31 → 2026-06-16 · 87 obs

○ 2026-03-29 22:43:20
● 2026-03-31 10:52:36
○ 2026-04-02 06:31:10
○ 2026-04-09 07:48:54
● 2026-04-10 09:03:20
○ 2026-04-10 13:38:10
● 2026-04-10 14:45:46
○ 2026-04-10 23:38:46
○ 2026-04-12 06:38:00
● 2026-04-12 11:36:40
○ 2026-04-13 01:37:50
● 2026-04-13 07:09:50
○ 2026-04-13 08:05:26
○ 2026-04-14 07:02:46
● 2026-04-14 07:51:18
● 2026-04-15 13:20:46
○ 2026-04-15 18:24:28
● 2026-04-17 01:42:46
○ 2026-04-17 15:43:44
○ 2026-04-24 21:22:18
● 2026-04-25 01:03:40
○ 2026-04-25 02:21:32
○ 2026-04-25 08:02:42
● 2026-04-25 11:53:46
○ 2026-04-25 17:53:16
○ 2026-04-27 13:39:04
● 2026-04-27 17:44:52
○ 2026-04-27 18:40:04
○ 2026-04-29 03:58:12
● 2026-04-29 11:44:44
○ 2026-04-29 12:55:46
○ 2026-04-30 14:32:52
● 2026-04-30 15:18:08
○ 2026-04-30 17:08:32
● 2026-04-30 19:36:52
○ 2026-04-30 21:49:12
○ 2026-05-06 05:45:06
● 2026-05-06 11:00:46
● 2026-05-06 14:45:50
○ 2026-05-06 15:42:02
○ 2026-05-07 23:35:20
● 2026-05-08 02:23:56
○ 2026-05-08 04:30:06
○ 2026-05-10 00:51:34
● 2026-05-10 05:41:04
○ 2026-05-10 11:07:38
○ 2026-05-13 02:11:56
● 2026-05-13 10:04:50
○ 2026-05-13 10:42:56
● 2026-05-13 17:24:16
○ 2026-05-13 22:13:06
● 2026-05-14 15:42:52
○ 2026-05-14 23:12:54
○ 2026-05-22 01:00:00
● 2026-05-22 04:54:20
○ 2026-05-22 06:19:42
○ 2026-05-27 01:56:22
● 2026-05-27 05:33:04
○ 2026-05-27 12:47:04
● 2026-05-27 20:33:20
● 2026-05-28 01:04:32
○ 2026-05-28 03:36:34
○ 2026-05-29 07:55:18
● 2026-05-29 16:18:42
○ 2026-05-30 06:31:00
○ 2026-05-30 20:10:00
● 2026-05-31 12:46:18
● 2026-06-01 11:56:02
○ 2026-06-01 22:19:22
○ 2026-06-02 11:50:46
● 2026-06-02 15:28:14
○ 2026-06-02 19:57:30
○ 2026-06-04 03:46:54
● 2026-06-04 12:48:04
○ 2026-06-04 17:59:16
● 2026-06-04 18:33:54
○ 2026-06-05 01:13:08
○ 2026-06-07 11:28:28
● 2026-06-07 16:11:30
○ 2026-06-07 20:07:30
○ 2026-06-10 02:18:00
● 2026-06-10 03:16:54
○ 2026-06-11 08:21:52
○ 2026-06-15 23:39:48
● 2026-06-16 03:53:44
○ 2026-06-16 04:34:04
○ 2026-06-17 14:01:42

○A108.156.85.1112026-03-31 → 2026-06-16 · 87 obs

○A108.156.85.462026-03-31 → 2026-06-16 · 87 obs

○A108.156.85.892026-03-31 → 2026-06-16 · 87 obs

○A13.113.48.1902018-06-16 → 2018-09-08 · 5 obs

○ 2017-05-24 06:16:14
● 2018-06-16 00:59:16
● 2018-09-08 01:26:56
○ 2026-02-14 20:08:58
○ 2026-06-17 14:01:42

●A13.226.209.1132026-02-14 → 2026-06-17 · 57 obs

○ 2018-09-08 01:26:56
● 2026-02-14 20:08:58
● 2026-02-19 04:49:56
○ 2026-02-19 07:44:18
○ 2026-02-19 12:36:58
● 2026-02-19 13:08:28
● 2026-02-24 02:07:36
○ 2026-02-24 08:58:44
● 2026-02-25 04:31:32
● 2026-03-01 05:17:48
○ 2026-03-01 07:17:12
○ 2026-03-01 14:41:46
● 2026-03-03 00:36:20
● 2026-03-04 01:19:50
○ 2026-03-04 04:08:04
○ 2026-03-12 05:55:12
● 2026-03-12 06:42:52
○ 2026-03-12 10:09:52
○ 2026-03-18 05:21:00
● 2026-03-18 11:17:50
○ 2026-03-18 13:29:54
○ 2026-03-20 08:14:06
● 2026-03-20 10:44:06
○ 2026-03-20 11:16:46
● 2026-03-21 15:01:56
○ 2026-03-21 21:29:32
○ 2026-04-13 07:09:50
● 2026-04-13 08:05:26
○ 2026-04-14 07:02:46
○ 2026-05-24 20:24:08
● 2026-05-25 02:49:38
○ 2026-05-25 06:14:44
○ 2026-05-26 06:23:08
● 2026-05-26 08:12:54
○ 2026-05-26 09:55:06
○ 2026-06-10 03:16:54
● 2026-06-11 08:21:52
● 2026-06-11 09:59:32
○ 2026-06-12 06:09:48
○ 2026-06-12 15:59:16
● 2026-06-12 17:16:58
○ 2026-06-13 00:29:48
○ 2026-06-13 11:08:06
● 2026-06-14 15:00:02
● 2026-06-14 18:38:16
○ 2026-06-14 20:44:50
● 2026-06-15 06:39:22
○ 2026-06-15 09:30:58
● 2026-06-15 10:33:22
● 2026-06-15 13:36:48
○ 2026-06-15 17:02:18
○ 2026-06-15 17:43:46
● 2026-06-15 21:25:34
○ 2026-06-15 23:39:48
○ 2026-06-17 07:48:54
● 2026-06-17 14:01:38
● 2026-06-17 14:01:42

●A13.226.209.192026-02-14 → 2026-06-17 · 57 obs

●A13.226.209.242026-02-14 → 2026-06-17 · 57 obs

●A13.226.209.572026-02-14 → 2026-06-17 · 57 obs

○A13.33.235.1142026-03-25 → 2026-03-25 · 4 obs

○ 2026-03-24 13:03:54
● 2026-03-25 11:25:00
○ 2026-03-25 13:48:44
○ 2026-06-17 14:01:42

○A13.33.235.1272026-03-25 → 2026-03-25 · 4 obs

○ 2026-03-24 13:03:54
● 2026-03-25 11:25:00
○ 2026-03-25 13:48:44
○ 2026-06-17 14:01:42

○A13.33.235.352026-03-25 → 2026-03-25 · 4 obs

○ 2026-03-24 13:03:54
● 2026-03-25 11:25:00
○ 2026-03-25 13:48:44
○ 2026-06-17 14:01:42

○A13.33.235.682026-03-25 → 2026-03-25 · 4 obs

○ 2026-03-24 13:03:54
● 2026-03-25 11:25:00
○ 2026-03-25 13:48:44
○ 2026-06-17 14:01:42

○A18.161.21.1162026-04-24 → 2026-05-26 · 36 obs

○ 2026-04-23 17:23:40
● 2026-04-24 12:34:40
○ 2026-04-24 17:23:42
○ 2026-04-26 11:53:48
● 2026-04-26 15:25:46
○ 2026-04-26 16:55:58
● 2026-04-26 18:02:06
○ 2026-04-26 22:49:40
○ 2026-04-27 03:57:48
● 2026-04-27 08:58:26
● 2026-04-27 13:39:04
○ 2026-04-27 17:44:52
○ 2026-04-30 22:57:22
● 2026-04-30 23:35:48
○ 2026-05-01 00:12:00
○ 2026-05-03 06:06:30
● 2026-05-03 09:12:14
○ 2026-05-03 11:11:10
○ 2026-05-09 06:18:44
● 2026-05-09 19:27:42
● 2026-05-09 22:20:50
○ 2026-05-10 00:51:34
○ 2026-05-10 05:41:04
● 2026-05-10 11:07:38
○ 2026-05-10 14:39:54
○ 2026-05-10 20:28:16
● 2026-05-11 07:05:26
○ 2026-05-11 07:36:32
○ 2026-05-19 12:38:08
● 2026-05-19 16:22:16
● 2026-05-19 18:04:40
○ 2026-05-19 19:43:34
○ 2026-05-26 08:12:54
● 2026-05-26 09:55:06
○ 2026-05-26 13:32:06
○ 2026-06-17 14:01:42

○A18.161.21.432026-04-24 → 2026-05-26 · 36 obs

○A18.161.21.712026-04-24 → 2026-05-26 · 36 obs

○A18.161.21.772026-04-24 → 2026-05-26 · 36 obs

○A18.165.9.1172026-04-06 → 2026-04-06 · 4 obs

○ 2026-04-05 20:25:44
● 2026-04-06 08:50:04
○ 2026-04-06 10:45:08
○ 2026-06-17 14:01:42

○A18.165.9.352026-04-06 → 2026-04-06 · 4 obs

○ 2026-04-05 20:25:44
● 2026-04-06 08:50:04
○ 2026-04-06 10:45:08
○ 2026-06-17 14:01:42

○A18.165.9.82026-04-06 → 2026-04-06 · 4 obs

○ 2026-04-05 20:25:44
● 2026-04-06 08:50:04
○ 2026-04-06 10:45:08
○ 2026-06-17 14:01:42

○A18.165.9.872026-04-06 → 2026-04-06 · 4 obs

○ 2026-04-05 20:25:44
● 2026-04-06 08:50:04
○ 2026-04-06 10:45:08
○ 2026-06-17 14:01:42

○A18.244.202.402026-04-03 → 2026-05-25 · 32 obs

○ 2026-04-02 06:31:10
● 2026-04-03 04:54:28
○ 2026-04-03 17:40:14
○ 2026-04-03 18:30:02
● 2026-04-04 02:17:08
○ 2026-04-04 06:29:14
○ 2026-04-04 07:03:24
● 2026-04-05 00:55:36
○ 2026-04-05 07:17:12
○ 2026-04-07 02:21:42
● 2026-04-08 03:24:30
○ 2026-04-08 15:43:32
● 2026-04-09 04:20:28
○ 2026-04-09 07:48:54
○ 2026-04-11 03:56:16
● 2026-04-11 11:19:48
○ 2026-04-12 06:38:00
○ 2026-04-18 11:51:02
● 2026-04-18 22:59:02
○ 2026-04-19 19:41:18
○ 2026-05-03 14:26:28
● 2026-05-03 15:49:34
○ 2026-05-04 01:24:46
○ 2026-05-06 14:45:50
● 2026-05-06 15:42:02
○ 2026-05-06 16:21:14
○ 2026-05-25 02:49:38
● 2026-05-25 06:14:44
○ 2026-05-25 06:58:10
● 2026-05-25 08:42:56
○ 2026-05-25 12:05:16
○ 2026-06-17 14:01:42

○A18.244.202.512026-04-03 → 2026-05-25 · 32 obs

○A18.244.202.752026-04-03 → 2026-05-25 · 32 obs

○A18.244.202.792026-04-03 → 2026-05-25 · 32 obs

○A18.67.233.1012026-06-03 → 2026-06-03 · 7 obs

○ 2026-06-02 19:57:30
● 2026-06-03 04:31:02
○ 2026-06-03 06:03:22
○ 2026-06-03 20:13:38
● 2026-06-03 22:43:52
○ 2026-06-04 00:09:20
○ 2026-06-17 14:01:42

○A18.67.233.1092026-06-03 → 2026-06-03 · 7 obs

○ 2026-06-02 19:57:30
● 2026-06-03 04:31:02
○ 2026-06-03 06:03:22
○ 2026-06-03 20:13:38
● 2026-06-03 22:43:52
○ 2026-06-04 00:09:20
○ 2026-06-17 14:01:42

○A18.67.233.272026-06-03 → 2026-06-03 · 7 obs

○ 2026-06-02 19:57:30
● 2026-06-03 04:31:02
○ 2026-06-03 06:03:22
○ 2026-06-03 20:13:38
● 2026-06-03 22:43:52
○ 2026-06-04 00:09:20
○ 2026-06-17 14:01:42

○A18.67.233.862026-06-03 → 2026-06-03 · 7 obs

○ 2026-06-02 19:57:30
● 2026-06-03 04:31:02
○ 2026-06-03 06:03:22
○ 2026-06-03 20:13:38
● 2026-06-03 22:43:52
○ 2026-06-04 00:09:20
○ 2026-06-17 14:01:42

○A3.162.112.162026-04-19 → 2026-04-19 · 4 obs

○ 2026-04-18 22:59:02
● 2026-04-19 19:41:18
○ 2026-04-22 00:48:16
○ 2026-06-17 14:01:42

○A3.162.112.262026-04-19 → 2026-04-19 · 4 obs

○ 2026-04-18 22:59:02
● 2026-04-19 19:41:18
○ 2026-04-22 00:48:16
○ 2026-06-17 14:01:42

○A3.162.112.682026-04-19 → 2026-04-19 · 4 obs

○ 2026-04-18 22:59:02
● 2026-04-19 19:41:18
○ 2026-04-22 00:48:16
○ 2026-06-17 14:01:42

○A3.162.112.742026-04-19 → 2026-04-19 · 4 obs

○ 2026-04-18 22:59:02
● 2026-04-19 19:41:18
○ 2026-04-22 00:48:16
○ 2026-06-17 14:01:42

○A3.169.231.1122026-02-24 → 2026-03-28 · 40 obs

○ 2026-02-24 02:07:36
● 2026-02-24 08:58:44
○ 2026-02-25 04:31:32
○ 2026-03-01 05:17:48
● 2026-03-01 07:17:12
● 2026-03-01 14:41:46
○ 2026-03-03 00:36:20
○ 2026-03-04 01:19:50
● 2026-03-04 04:08:04
○ 2026-03-04 07:49:36
● 2026-03-06 18:07:04
○ 2026-03-08 00:13:48
○ 2026-03-08 10:16:58
● 2026-03-08 14:15:14
○ 2026-03-08 15:54:16
○ 2026-03-08 17:23:56
● 2026-03-08 18:22:38
○ 2026-03-08 22:14:50
● 2026-03-09 06:48:08
○ 2026-03-12 05:55:12
○ 2026-03-13 07:09:24
● 2026-03-14 00:31:36
● 2026-03-14 02:48:22
○ 2026-03-14 10:28:20
● 2026-03-14 11:40:54
○ 2026-03-15 17:41:22
○ 2026-03-15 18:48:58
● 2026-03-16 03:11:34
○ 2026-03-17 12:33:22
● 2026-03-18 05:21:00
○ 2026-03-18 11:17:50
○ 2026-03-18 13:29:54
● 2026-03-20 08:14:06
○ 2026-03-20 10:44:06
● 2026-03-20 11:16:46
○ 2026-03-21 15:01:56
○ 2026-03-25 13:48:44
● 2026-03-28 09:37:26
○ 2026-03-28 14:14:42
○ 2026-06-17 14:01:42

○A3.169.231.452026-02-24 → 2026-03-28 · 40 obs

○A3.169.231.482026-02-24 → 2026-03-28 · 40 obs

○A3.169.231.552026-02-24 → 2026-03-28 · 40 obs

○A3.170.185.102026-05-19 → 2026-06-08 · 54 obs

○ 2026-05-18 22:26:06
● 2026-05-19 09:14:32
● 2026-05-19 12:38:08
○ 2026-05-19 16:22:16
○ 2026-05-19 18:04:40
● 2026-05-19 19:43:34
● 2026-05-20 13:23:58
○ 2026-05-20 18:10:04
● 2026-05-20 23:21:52
● 2026-05-22 01:00:00
○ 2026-05-22 04:54:20
● 2026-05-22 06:19:42
● 2026-05-24 20:24:08
○ 2026-05-25 02:49:38
○ 2026-05-25 06:14:44
● 2026-05-25 06:58:10
○ 2026-05-25 08:42:56
● 2026-05-25 12:05:16
● 2026-05-26 06:23:08
○ 2026-05-26 08:12:54
○ 2026-05-26 09:55:06
● 2026-05-26 13:32:06
● 2026-05-27 01:56:22
○ 2026-05-27 05:33:04
● 2026-05-27 12:47:04
○ 2026-05-27 20:33:20
○ 2026-05-28 01:04:32
● 2026-05-28 03:36:34
● 2026-05-29 07:55:18
○ 2026-05-29 16:18:42
● 2026-05-30 06:31:00
● 2026-05-30 20:10:00
○ 2026-05-31 12:46:18
○ 2026-06-01 11:56:02
● 2026-06-01 22:19:22
● 2026-06-02 11:50:46
○ 2026-06-02 15:28:14
● 2026-06-02 19:57:30
○ 2026-06-03 04:31:02
● 2026-06-03 06:03:22
● 2026-06-03 20:13:38
○ 2026-06-03 22:43:52
● 2026-06-04 00:09:20
● 2026-06-04 03:46:54
○ 2026-06-04 12:48:04
● 2026-06-04 17:59:16
○ 2026-06-04 18:33:54
● 2026-06-05 01:13:08
● 2026-06-07 11:28:28
○ 2026-06-07 16:11:30
● 2026-06-07 20:07:30
● 2026-06-08 07:39:54
○ 2026-06-08 15:33:04
○ 2026-06-17 14:01:42

○A3.170.185.872026-05-19 → 2026-06-08 · 54 obs

○A3.170.185.882026-05-19 → 2026-06-08 · 54 obs

○A3.170.185.972026-05-19 → 2026-06-08 · 54 obs

○A52.69.167.992017-05-24 → 2017-05-24 · 4 obs

○ 2016-07-16 04:50:00
● 2017-05-24 06:16:14
○ 2018-06-16 00:59:16
○ 2026-06-17 14:01:42

○A52.85.31.282026-03-08 → 2026-05-20 · 19 obs

○ 2026-03-06 18:07:04
● 2026-03-08 00:13:48
○ 2026-03-08 10:16:58
○ 2026-03-08 15:54:16
● 2026-03-08 17:23:56
○ 2026-03-08 18:22:38
○ 2026-03-29 08:40:30
● 2026-03-29 22:43:20
○ 2026-03-31 10:52:36
● 2026-04-02 06:31:10
○ 2026-04-03 04:54:28
○ 2026-04-05 00:55:36
● 2026-04-05 07:17:12
● 2026-04-05 20:25:44
○ 2026-04-06 08:50:04
○ 2026-05-20 13:23:58
● 2026-05-20 18:10:04
○ 2026-05-20 23:21:52
○ 2026-06-17 14:01:42

○A52.85.31.412026-03-08 → 2026-05-20 · 19 obs

○A52.85.31.492026-03-08 → 2026-05-20 · 19 obs

○A52.85.31.582026-03-08 → 2026-05-20 · 19 obs

○A54.230.201.1182026-04-23 → 2026-06-17 · 89 obs

○ 2026-04-22 15:43:14
● 2026-04-23 11:39:44
● 2026-04-23 17:23:40
○ 2026-04-24 12:34:40
● 2026-04-24 17:23:42
● 2026-04-24 21:22:18
○ 2026-04-25 01:03:40
● 2026-04-25 02:21:32
● 2026-04-25 08:02:42
○ 2026-04-25 11:53:46
● 2026-04-25 17:53:16
● 2026-04-26 11:53:48
○ 2026-04-26 15:25:46
● 2026-04-26 16:55:58
○ 2026-04-26 18:02:06
● 2026-04-26 22:49:40
● 2026-04-27 03:57:48
○ 2026-04-27 08:58:26
○ 2026-04-27 17:44:52
● 2026-04-27 18:40:04
● 2026-04-29 03:58:12
○ 2026-04-29 11:44:44
● 2026-04-29 12:55:46
● 2026-04-30 14:32:52
○ 2026-04-30 15:18:08
● 2026-04-30 17:08:32
○ 2026-04-30 19:36:52
● 2026-04-30 21:49:12
● 2026-04-30 22:57:22
○ 2026-04-30 23:35:48
● 2026-05-01 00:12:00
● 2026-05-03 06:06:30
○ 2026-05-03 09:12:14
● 2026-05-03 11:11:10
● 2026-05-03 14:26:28
○ 2026-05-03 15:49:34
● 2026-05-04 01:24:46
● 2026-05-06 05:45:06
○ 2026-05-06 11:00:46
○ 2026-05-06 15:42:02
● 2026-05-06 16:21:14
● 2026-05-07 23:35:20
○ 2026-05-08 02:23:56
● 2026-05-08 04:30:06
● 2026-05-09 06:18:44
○ 2026-05-09 19:27:42
○ 2026-05-09 22:20:50
● 2026-05-10 00:51:34
○ 2026-05-10 05:41:04
○ 2026-05-10 11:07:38
● 2026-05-10 14:39:54
● 2026-05-10 20:28:16
○ 2026-05-11 07:05:26
● 2026-05-11 07:36:32
● 2026-05-13 02:11:56
○ 2026-05-13 10:04:50
● 2026-05-13 10:42:56
○ 2026-05-13 17:24:16
● 2026-05-13 22:13:06
○ 2026-05-14 15:42:52
● 2026-05-14 23:12:54
● 2026-05-18 22:26:06
○ 2026-05-19 09:14:32
○ 2026-06-08 07:39:54
● 2026-06-08 15:33:04
● 2026-06-10 02:18:00
○ 2026-06-10 03:16:54
○ 2026-06-11 09:59:32
● 2026-06-12 06:09:48
● 2026-06-12 15:59:16
○ 2026-06-12 17:16:58
● 2026-06-13 00:29:48
● 2026-06-13 11:08:06
○ 2026-06-14 15:00:02
○ 2026-06-14 18:38:16
● 2026-06-14 20:44:50
○ 2026-06-15 06:39:22
● 2026-06-15 09:30:58
○ 2026-06-15 10:33:22
○ 2026-06-15 13:36:48
● 2026-06-15 17:02:18
● 2026-06-15 17:43:46
○ 2026-06-15 21:25:34
● 2026-06-15 23:39:48
○ 2026-06-16 03:53:44
● 2026-06-16 04:34:04
● 2026-06-17 07:48:54
○ 2026-06-17 14:01:38
○ 2026-06-17 14:01:42

○A54.230.201.272026-04-23 → 2026-06-17 · 89 obs

○A54.230.201.32026-04-23 → 2026-06-17 · 89 obs

○A54.230.201.642026-04-23 → 2026-06-17 · 89 obs

○A54.64.33.2152018-06-16 → 2018-09-08 · 5 obs

○ 2017-05-24 06:16:14
● 2018-06-16 00:59:16
● 2018-09-08 01:26:56
○ 2026-02-14 20:08:58
○ 2026-06-17 14:01:42

○A54.64.36.2352015-08-13 → 2016-07-16 · 4 obs

● 2015-08-13 18:44:32
● 2016-07-16 04:50:00
○ 2017-05-24 06:16:14
○ 2026-06-17 14:01:42

○A99.86.91.302026-02-19 → 2026-04-22 · 78 obs

○ 2026-02-19 04:49:56
● 2026-02-19 07:44:18
● 2026-02-19 12:36:58
○ 2026-02-19 13:08:28
○ 2026-03-04 04:08:04
● 2026-03-04 07:49:36
○ 2026-03-06 18:07:04
○ 2026-03-08 00:13:48
● 2026-03-08 10:16:58
○ 2026-03-08 14:15:14
● 2026-03-08 15:54:16
○ 2026-03-08 17:23:56
○ 2026-03-08 18:22:38
● 2026-03-08 22:14:50
○ 2026-03-09 06:48:08
● 2026-03-12 05:55:12
○ 2026-03-12 06:42:52
● 2026-03-12 10:09:52
● 2026-03-13 07:09:24
○ 2026-03-14 00:31:36
○ 2026-03-14 02:48:22
● 2026-03-14 10:28:20
○ 2026-03-14 11:40:54
● 2026-03-15 17:41:22
● 2026-03-15 18:48:58
○ 2026-03-16 03:11:34
● 2026-03-17 12:33:22
○ 2026-03-18 05:21:00
○ 2026-03-18 11:17:50
● 2026-03-18 13:29:54
○ 2026-03-20 08:14:06
○ 2026-03-21 15:01:56
● 2026-03-21 21:29:32
● 2026-03-24 13:03:54
○ 2026-03-25 11:25:00
● 2026-03-25 13:48:44
○ 2026-03-28 09:37:26
● 2026-03-28 14:14:42
● 2026-03-29 08:40:30
○ 2026-03-29 22:43:20
○ 2026-04-03 04:54:28
● 2026-04-03 17:40:14
● 2026-04-03 18:30:02
○ 2026-04-04 02:17:08
● 2026-04-04 06:29:14
● 2026-04-04 07:03:24
○ 2026-04-05 00:55:36
○ 2026-04-06 08:50:04
● 2026-04-06 10:45:08
● 2026-04-07 02:21:42
○ 2026-04-08 03:24:30
● 2026-04-08 15:43:32
○ 2026-04-09 04:20:28
● 2026-04-09 07:48:54
○ 2026-04-10 09:03:20
● 2026-04-10 13:38:10
○ 2026-04-10 14:45:46
● 2026-04-10 23:38:46
● 2026-04-11 03:56:16
○ 2026-04-11 11:19:48
● 2026-04-12 06:38:00
○ 2026-04-12 11:36:40
● 2026-04-13 01:37:50
○ 2026-04-13 07:09:50
○ 2026-04-13 08:05:26
● 2026-04-14 07:02:46
○ 2026-04-14 07:51:18
○ 2026-04-15 13:20:46
● 2026-04-15 18:24:28
○ 2026-04-17 01:42:46
● 2026-04-17 15:43:44
● 2026-04-18 11:51:02
○ 2026-04-18 22:59:02
○ 2026-04-19 19:41:18
● 2026-04-22 00:48:16
● 2026-04-22 15:43:14
○ 2026-04-23 11:39:44
○ 2026-06-17 14:01:42

○A99.86.91.512026-02-19 → 2026-04-22 · 78 obs

○A99.86.91.92026-02-19 → 2026-04-22 · 78 obs

○A99.86.91.982026-02-19 → 2026-04-22 · 78 obs

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
jp	a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp...	-
atcoder.jp	ns-96.awsdns-12.com, ns-890.awsdns-47.net, ns-1144.awsdns-15.org, ns-1543.awsdns-00.co.uk	-

✅ Authoritative Response

Server:205.251.196.120

NS records: ns-96.awsdns-12.com, ns-890.awsdns-47.net, ns-1144.awsdns-15.org, ns-1543.awsdns-00.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for atcoder.jp (unsigned zone)

⏱️ Timing

Total: 1366ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`13.226.209.24, 13.226.209.57...`
NS	4	`ns-1144.awsdns-15.org, ns-1543.awsdns-00.co.uk...`
MX	7	`aspmx.l.google.com (pri: 10), alt1.aspmx.l.google.com (pri: 20)...`
TXT	8	`1password-site-verification=H3CJM364F5GI, MS=ms90685883...`
SOA	1	`ns-96.awsdns-12.com awsdns-hostmaster.am`

Analysis

Hierarchy

atcoder.jp sits above info.atcoder.jp, img.atcoder.jp and past.atcoder.jp in the domain hierarchy.

IP Addresses

atcoder.jp directs to four IP numbers, which are 13.226.209.19, 13.226.209.24, 13.226.209.57 and 13.226.209.113.

Among the host names that share IP numbers with atcoder.jp are artsupermarket.co, searchdatestoday.com, fadqbook.com and two others.

Name Servers

The domain atcoder.jp is delegated to these four name servers: ns-96.awsdns-12.com, ns-890.awsdns-47.net, ns-1144.awsdns-15.org and ns-1543.awsdns-00.co.uk.

There is at least partial name server overlap between atcoder.jp and other domains — biblebee.com, equinoxfitness.com, rwapitest.com and two more among them.

All four hostnames — ns-96.awsdns-12.com, ns-890.awsdns-47.net, ns-1144.awsdns-15.org and ns-1543.awsdns-00.co.uk — resolve to two IP numbers apiece: ns-96.awsdns-12.com to 205.251.192.96 and 2600:9000:5300:6000::1; ns-890.awsdns-47.net to 205.251.195.122 and 2600:9000:5303:7a00::1; ns-1144.awsdns-15.org to 205.251.196.120 and 2600:9000:5304:7800::1; ns-1543.awsdns-00.co.uk to 205.251.198.7 and 2600:9000:5306:700::1.

Mail Servers

atcoder.jp accepts email via 7 mail servers: aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com and 4 other.

atcoder.jp shares at least some of its mail servers with other domains — for example develephant.com, beyondtheinterview.com, 1620.dk and two more.

It is common to find these mail servers paired with mail servers aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and 3 more.

Hosts with two IP numbers each:

aspmx2.googlemail.com directs traffic to 108.177.123.26 and 2800:3f0:4003:c0f::1a.

aspmx3.googlemail.com directs traffic to 172.253.116.27 and 2a00:1450:400b:c02::1b.

aspmx4.googlemail.com directs traffic to 192.178.223.27 and 2a00:1450:4009:c0f::1b.

aspmx5.googlemail.com directs traffic to 172.253.157.26 and 2a00:1450:400c:c23::1a.

aspmx.l.google.com directs traffic to 142.250.31.26 and 2607:f8b0:4004:c1b::1a.

alt1.aspmx.l.google.com directs traffic to 108.177.123.27 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com directs traffic to 172.253.116.27 and 2a00:1450:400b:c02::1b.

Both aspmx3.googlemail.com and alt2.aspmx.l.google.com resolve to 2a00:1450:400b:c02::1b IP addresses each.

Both aspmx3.googlemail.com and alt2.aspmx.l.google.com resolve to 172.253.116.27 IP addresses each.