info.atcoder.jp - dns.ninja

`info.atcoder.jp`

CNAME	`hatenablog.com`
DNSSEC	⚠️ Not signed
A	3.166.181.36^{🇺🇸 Amazon3.166.176.0/21}
		PTR	`server-3-166-181-36.mia50.r.cloudfront.net`
A	3.166.181.74^{🇺🇸 Amazon3.166.176.0/21}
A	3.166.181.75^{🇺🇸 Amazon3.166.176.0/21}
A	3.166.181.100^{🇺🇸 Amazon3.166.176.0/21}
NS	`ns-1997.awsdns-57.co.uk` ⭐
		A	2600:9000:5307:cd00::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-1997.awsdns-57.co.uk`
		A	205.251.199.205^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-1997.awsdns-57.co.uk`
NS	`ns-1380.awsdns-44.org`
		A	2600:9000:5305:6400::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1380.awsdns-44.org`
		A	205.251.197.100^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1380.awsdns-44.org`
NS	`ns-206.awsdns-25.com`
		A	2600:9000:5300:ce00::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-206.awsdns-25.com`
		A	205.251.192.206^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-206.awsdns-25.com`
NS	`ns-562.awsdns-06.net`
		A	2600:9000:5302:3200::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-562.awsdns-06.net`
		A	205.251.194.50^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-562.awsdns-06.net`
MX	`mailinbound.hatena.ne.jp` ⭐
		A	18.181.72.178^{🇯🇵 Amazon18.180.0.0/15 EC2 NRT prefix}
			PTR	`ec2-18-181-72-178.ap-northeast-1.compute.amazonaws.com`
		A	54.248.132.246^{🇯🇵 Amazon54.248.128.0/17 EC2 NRT prefix}
			PTR	`ec2-54-248-132-246.ap-northeast-1.compute.amazonaws.com`
TXT	`google-site-verification=3o5PJrq5BegVw-9FP9CqwT9HQB4YpYf-yh0sVhJO3rg`
TXT	`google-site-verification=oIk95RRyl0cakm9QhNx5p7a4oU_Zay1tGKiLfEfngvc`
SOA	`ns-1997.awsdns-57.co.uk`awsdns-hostmaster@amazon.com serial=1

`atcoder.jp`

	DNSSEC	⚠️ Not signed
	A	13.226.209.19^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
	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` ⭐
	NS	`ns-1144.awsdns-15.org`
	NS	`ns-1543.awsdns-00.co.uk`
	NS	`ns-890.awsdns-47.net`
	MX	`aspmx.l.google.com` ⭐
	MX	`alt1.aspmx.l.google.com`⁽²⁰⁾
	MX	`alt2.aspmx.l.google.com`⁽²⁰⁾
	MX	`aspmx2.googlemail.com`⁽³⁰⁾
	MX	`aspmx3.googlemail.com`⁽³⁰⁾
	MX	`aspmx4.googlemail.com`⁽³⁰⁾
	MX	`aspmx5.googlemail.com`⁽³⁰⁾
	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

rank #49478 globally
rank #1017 in the tld
📈 Tranco rank: #40,252

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info.lviv.ua

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info.s3-website.ap-southeast-2.amazonaws.com

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DNS History

1 record (1 active, 0 former)

●CNAMEhatenablog.com2026-05-15 → 2026-06-17 · 2 obs

● 2026-05-15 02:50:18
● 2026-06-17 22:09:22

🔍 DNS Trace

📋 Delegation Chain

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

✅ Authoritative Response

Server:205.251.192.96

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for atcoder.jp (unsigned zone)

⏱️ Timing

Total: 2190ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`hatenablog.com`

Analysis

IP Addresses

info.atcoder.jp points to the four IP addresses 3.166.181.36, 3.166.181.74, 3.166.181.75 and 3.166.181.100.

Additional host names — public.carsprogram.org, chiral.hatenablog.com, synboo.hatenablog.com and two others — share IP numbers with info.atcoder.jp.

Name Servers

info.atcoder.jp has four authoritative name servers: ns-206.awsdns-25.com, ns-562.awsdns-06.net, ns-1380.awsdns-44.org and ns-1997.awsdns-57.co.uk.

There is at least partial name server overlap between info.atcoder.jp and other domains — dev.static.sr.cap.bluehost.com, speedblitzblues.com.au, flightright.pl and two more among them.

The name servers ns-433.awsdns-54.com, ns-1418.awsdns-49.org and ns-1828.awsdns-36.co.uk are often found in combination with these name servers.

All four hostnames — ns-206.awsdns-25.com, ns-562.awsdns-06.net, ns-1380.awsdns-44.org and ns-1997.awsdns-57.co.uk — resolve to two IP numbers apiece: ns-206.awsdns-25.com to 205.251.192.206 and 2600:9000:5300:ce00::1; ns-562.awsdns-06.net to 205.251.194.50 and 2600:9000:5302:3200::1; ns-1380.awsdns-44.org to 205.251.197.100 and 2600:9000:5305:6400::1; ns-1997.awsdns-57.co.uk to 205.251.199.205 and 2600:9000:5307:cd00::1.

Mail Servers

info.atcoder.jp has one mail server: mailinbound.hatena.ne.jp.

info.atcoder.jp shares the same mail server setup as other domains, including ad-hatena.com, nobodyordinary.g.hatena.ne.jp, monsterhunter.g.hatena.ne.jp and two others.

mailinbound.hatena.ne.jp carries two IP numbers: 18.181.72.178 and 54.248.132.246.