kupper.dev - dns.ninja

`kupper.dev`

DNSSEC	⚠️ Not signed
A	13.226.238.76^{🇺🇸 Amazon13.226.232.0/21 - Cloudfront}
		PTR	`server-13-226-238-76.iad61.r.cloudfront.net`
A	13.226.238.78^{🇺🇸 Amazon13.226.232.0/21 - Cloudfront}
A	13.226.238.83^{🇺🇸 Amazon13.226.232.0/21 - Cloudfront}
A	13.226.238.107^{🇺🇸 Amazon13.226.232.0/21 - Cloudfront}
NS	`ns-1084.awsdns-07.org` ⭐
		A	2600:9000:5304:3c00::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1084.awsdns-07.org`
		A	205.251.196.60^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1084.awsdns-07.org`
NS	`ns-1696.awsdns-20.co.uk`
		A	2600:9000:5306:a000::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1696.awsdns-20.co.uk`
		A	205.251.198.160^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1696.awsdns-20.co.uk`
NS	`ns-212.awsdns-26.com`
		A	2600:9000:5300:d400::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-212.awsdns-26.com`
		A	205.251.192.212^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-212.awsdns-26.com`
NS	`ns-955.awsdns-55.net`
		A	2600:9000:5303:bb00::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-955.awsdns-55.net`
		A	205.251.195.187^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-955.awsdns-55.net`
MX	`mail.protonmail.ch` ⭐
		A	176.119.200.128^{🇨🇭 Proton176.119.200.0/24}
			PTR	`mail.protonmail.ch`
		A	185.70.42.128^{🇨🇭 Proton185.70.42.0/24}
			PTR	`mail.protonmail.ch`
		A	185.205.70.128^{🇫🇷 Proton185.205.70.0/24}
			PTR	`mail.protonmail.ch`
MX	`mailsec.protonmail.ch`⁽²⁰⁾
		A	176.119.200.129^{🇨🇭 Proton176.119.200.0/24}
			PTR	`mailsec.protonmail.ch`
		A	185.70.42.129^{🇨🇭 Proton185.70.42.0/24}
			PTR	`mailsec.protonmail.ch`
		A	185.205.70.129^{🇫🇷 Proton185.205.70.0/24}
			PTR	`mailsec.protonmail.ch`
TXT	`protonmail-verification=d735cade84422284e0372305f99d7e084847c750`
SOA	`ns-1084.awsdns-07.org`awsdns-hostmaster@amazon.com serial=1

`dev`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns-tld1.charlestonroadregistry.com` ⭐
	NS	`ns-tld2.charlestonroadregistry.com`
	NS	`ns-tld3.charlestonroadregistry.com`
	NS	`ns-tld4.charlestonroadregistry.com`
	NS	`ns-tld5.charlestonroadregistry.com`
	SOA	`ns-tld1.charlestonroadregistry.com`cloud-dns-hostmaster@google.com serial=1

🔒 HSTS Preload (+subdomains)

Same first word

kupper.se

kupper.dev

kupper.pl

kupper.co

kupper.de

kupper.ch

kupper.net

kupper.be

kupper.com.br

kupper.eu

kupper.com

kupper.nl

kupper.gmbh

kupper.ag

Similar names

prepuk.co.uk

purepk.org

kepurp.com

prepuk.com

upkepr.com

purepk.com

euprkp.com

perkup.coffee

upperk.com

kuperp.com

perkup.com.au

prepuk.hu

kruppe.ru

DNS History

90 records (10 active, 80 former)

●NSns-1084.awsdns-07.org2026-02-16 → 2026-06-21 · 2 obs

● 2026-02-16 10:13:50
● 2026-06-21 20:29:12

●NSns-1696.awsdns-20.co.uk2026-02-16 → 2026-06-21 · 2 obs

● 2026-02-16 10:13:50
● 2026-06-21 20:29:12

●NSns-212.awsdns-26.com2026-02-16 → 2026-06-21 · 2 obs

● 2026-02-16 10:13:50
● 2026-06-21 20:29:12

●NSns-955.awsdns-55.net2026-02-16 → 2026-06-21 · 2 obs

● 2026-02-16 10:13:50
● 2026-06-21 20:29:12

●MXmail.protonmail.ch2026-02-16 → 2026-06-21 · 2 obs

● 2026-02-16 10:13:50
● 2026-06-21 20:29:12

●MXmailsec.protonmail.ch2026-02-16 → 2026-06-21 · 2 obs

● 2026-02-16 10:13:50
● 2026-06-21 20:29:12

○A13.224.125.1292026-06-17 → 2026-06-17 · 10 obs

○ 2026-06-15 11:44:28
● 2026-06-17 01:07:24
○ 2026-06-17 02:08:12
● 2026-06-17 02:49:28
○ 2026-06-17 05:35:20
○ 2026-06-17 06:22:30
● 2026-06-17 06:57:56
● 2026-06-17 14:25:06
○ 2026-06-17 15:06:32
○ 2026-06-21 20:29:12

○A13.224.125.212026-06-17 → 2026-06-17 · 10 obs

○A13.224.125.242026-06-17 → 2026-06-17 · 10 obs

○A13.224.125.842026-06-17 → 2026-06-17 · 10 obs

●A13.226.238.1072026-02-19 → 2026-06-21 · 22 obs

○ 2026-02-16 10:13:50
● 2026-02-19 16:15:06
○ 2026-02-19 18:32:06
○ 2026-02-20 05:10:48
● 2026-02-20 05:52:08
○ 2026-02-20 08:23:02
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● 2026-03-03 00:12:50
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● 2026-03-04 12:56:32
○ 2026-03-04 23:26:10
○ 2026-06-18 16:25:14
● 2026-06-19 08:49:44
● 2026-06-19 23:16:24
○ 2026-06-20 06:01:56
● 2026-06-21 10:29:50
○ 2026-06-21 12:25:10
● 2026-06-21 16:01:54
○ 2026-06-21 16:31:56
● 2026-06-21 20:29:10
● 2026-06-21 20:29:12

●A13.226.238.762026-02-19 → 2026-06-21 · 22 obs

●A13.226.238.782026-02-19 → 2026-06-21 · 22 obs

●A13.226.238.832026-02-19 → 2026-06-21 · 22 obs

○A13.227.231.1172026-03-22 → 2026-03-22 · 4 obs

○ 2026-03-14 17:30:10
● 2026-03-22 10:49:56
○ 2026-03-22 12:12:52
○ 2026-06-21 20:29:12

○A13.227.231.1182026-03-22 → 2026-03-22 · 4 obs

○ 2026-03-14 17:30:10
● 2026-03-22 10:49:56
○ 2026-03-22 12:12:52
○ 2026-06-21 20:29:12

○A13.227.231.712026-03-22 → 2026-03-22 · 4 obs

○ 2026-03-14 17:30:10
● 2026-03-22 10:49:56
○ 2026-03-22 12:12:52
○ 2026-06-21 20:29:12

○A13.227.231.782026-03-22 → 2026-03-22 · 4 obs

○ 2026-03-14 17:30:10
● 2026-03-22 10:49:56
○ 2026-03-22 12:12:52
○ 2026-06-21 20:29:12

○A13.249.231.1022026-05-27 → 2026-05-30 · 10 obs

○ 2026-05-27 09:43:44
● 2026-05-27 10:39:44
○ 2026-05-27 22:11:02
○ 2026-05-28 20:42:00
● 2026-05-28 23:36:08
○ 2026-05-29 01:49:22
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● 2026-05-30 04:53:08
○ 2026-05-30 05:48:42
○ 2026-06-21 20:29:12

○A13.249.231.512026-05-27 → 2026-05-30 · 10 obs

○A13.249.231.612026-05-27 → 2026-05-30 · 10 obs

○A13.249.231.852026-05-27 → 2026-05-30 · 10 obs

○A13.33.82.262026-04-24 → 2026-05-10 · 20 obs

○ 2026-04-21 15:21:28
● 2026-04-24 03:49:00
○ 2026-04-24 05:00:20
○ 2026-04-25 12:13:00
● 2026-04-25 14:16:54
● 2026-04-25 20:15:46
○ 2026-04-26 02:13:18
○ 2026-04-28 16:12:36
● 2026-04-28 19:48:32
○ 2026-04-29 03:34:08
○ 2026-05-05 00:24:46
● 2026-05-05 08:00:18
○ 2026-05-05 12:15:42
○ 2026-05-08 20:34:46
● 2026-05-09 00:42:08
○ 2026-05-09 05:41:52
○ 2026-05-10 00:11:44
● 2026-05-10 02:12:10
○ 2026-05-10 04:38:14
○ 2026-06-21 20:29:12

○A13.33.82.472026-04-24 → 2026-05-10 · 20 obs

○A13.33.82.572026-04-24 → 2026-05-10 · 20 obs

○A13.33.82.982026-04-24 → 2026-05-10 · 20 obs

○A18.239.168.1272026-03-09 → 2026-05-20 · 19 obs

○ 2026-03-08 06:29:52
● 2026-03-09 00:36:26
○ 2026-03-09 02:59:28
○ 2026-04-20 17:15:26
● 2026-04-20 18:26:04
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● 2026-05-10 17:22:18
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○ 2026-05-14 22:56:54
● 2026-05-15 02:25:28
○ 2026-05-15 06:25:48
○ 2026-05-19 20:26:44
● 2026-05-20 02:38:54
● 2026-05-20 08:44:02
○ 2026-05-20 11:10:48
○ 2026-06-21 20:29:12

○A18.239.168.382026-03-09 → 2026-05-20 · 19 obs

○A18.239.168.452026-03-09 → 2026-05-20 · 19 obs

○A18.239.168.572026-03-09 → 2026-05-20 · 19 obs

○A18.67.162.202026-06-10 → 2026-06-15 · 19 obs

○ 2026-06-10 13:20:30
● 2026-06-10 19:55:52
○ 2026-06-10 21:11:32
● 2026-06-10 22:07:24
● 2026-06-11 03:18:02
○ 2026-06-11 10:14:10
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● 2026-06-12 07:08:04
○ 2026-06-12 15:10:28
○ 2026-06-13 13:39:22
● 2026-06-13 16:15:18
○ 2026-06-13 21:28:26
○ 2026-06-14 06:38:08
● 2026-06-14 09:20:20
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● 2026-06-14 20:00:42
● 2026-06-15 10:34:04
○ 2026-06-15 11:44:28
○ 2026-06-21 20:29:12

○A18.67.162.482026-06-10 → 2026-06-15 · 19 obs

○A18.67.162.512026-06-10 → 2026-06-15 · 19 obs

○A18.67.162.932026-06-10 → 2026-06-15 · 19 obs

○A18.67.233.1082026-05-28 → 2026-06-02 · 20 obs

○ 2026-05-27 22:11:02
● 2026-05-28 16:27:08
● 2026-05-28 18:36:12
○ 2026-05-28 20:42:00
○ 2026-05-29 17:43:04
● 2026-05-29 19:50:00
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○ 2026-05-30 11:17:30
● 2026-05-30 12:16:48
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● 2026-05-31 17:36:18
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○ 2026-06-01 21:27:42
● 2026-06-02 05:08:32
● 2026-06-02 10:12:52
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● 2026-06-02 13:19:06
○ 2026-06-02 14:28:44
○ 2026-06-21 20:29:12

○A18.67.233.142026-05-28 → 2026-06-02 · 20 obs

○A18.67.233.712026-05-28 → 2026-06-02 · 20 obs

○A18.67.233.752026-05-28 → 2026-06-02 · 20 obs

○A3.161.193.42026-03-31 → 2026-06-20 · 19 obs

○ 2026-03-30 02:14:18
● 2026-03-31 22:28:12
○ 2026-04-01 00:12:56
○ 2026-04-01 04:01:30
● 2026-04-01 14:32:16
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● 2026-04-02 11:03:18
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● 2026-04-03 14:20:58
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○ 2026-06-18 01:51:58
● 2026-06-19 20:37:12
● 2026-06-20 07:24:34
○ 2026-06-20 08:16:26
● 2026-06-20 22:32:52
○ 2026-06-21 00:34:42
○ 2026-06-21 20:29:12

○A3.161.193.612026-03-31 → 2026-06-20 · 19 obs

○A3.161.193.762026-03-31 → 2026-06-20 · 19 obs

○A3.161.193.962026-03-31 → 2026-06-20 · 19 obs

○A3.162.20.232026-02-23 → 2026-05-29 · 10 obs

○ 2026-02-21 05:48:24
● 2026-02-23 09:40:10
○ 2026-02-23 10:34:32
○ 2026-04-04 04:22:06
● 2026-04-04 11:01:14
○ 2026-04-04 19:19:38
○ 2026-05-29 01:49:22
● 2026-05-29 02:43:22
○ 2026-05-29 03:36:40
○ 2026-06-21 20:29:12

○A3.162.20.252026-02-23 → 2026-05-29 · 10 obs

○A3.162.20.472026-02-23 → 2026-05-29 · 10 obs

○A3.162.20.512026-02-23 → 2026-05-29 · 10 obs

○A3.162.247.112026-03-29 → 2026-06-10 · 20 obs

○ 2026-03-27 21:24:12
● 2026-03-29 04:59:26
○ 2026-03-29 14:00:38
○ 2026-03-29 22:40:38
● 2026-03-30 00:13:50
○ 2026-03-30 02:14:18
○ 2026-04-09 19:28:40
● 2026-04-10 00:14:04
○ 2026-04-10 19:25:24
○ 2026-04-14 21:02:44
● 2026-04-15 00:15:34
○ 2026-04-15 20:11:10
○ 2026-04-29 00:27:26
● 2026-04-29 03:34:08
● 2026-04-29 14:29:00
○ 2026-04-29 15:46:00
○ 2026-06-10 05:05:12
● 2026-06-10 13:20:30
○ 2026-06-10 19:55:52
○ 2026-06-21 20:29:12

○A3.162.247.1102026-03-29 → 2026-06-10 · 20 obs

○A3.162.247.62026-03-29 → 2026-06-10 · 20 obs

○A3.162.247.962026-03-29 → 2026-06-10 · 20 obs

○A3.163.139.382026-04-04 → 2026-04-04 · 4 obs

○ 2026-04-03 14:20:58
● 2026-04-04 00:13:58
○ 2026-04-04 01:15:30
○ 2026-06-21 20:29:12

○A3.163.139.472026-04-04 → 2026-04-04 · 4 obs

○ 2026-04-03 14:20:58
● 2026-04-04 00:13:58
○ 2026-04-04 01:15:30
○ 2026-06-21 20:29:12

○A3.163.139.502026-04-04 → 2026-04-04 · 4 obs

○ 2026-04-03 14:20:58
● 2026-04-04 00:13:58
○ 2026-04-04 01:15:30
○ 2026-06-21 20:29:12

○A3.163.139.582026-04-04 → 2026-04-04 · 4 obs

○ 2026-04-03 14:20:58
● 2026-04-04 00:13:58
○ 2026-04-04 01:15:30
○ 2026-06-21 20:29:12

○A3.164.206.1172026-03-25 → 2026-03-27 · 13 obs

○ 2026-03-22 15:11:12
● 2026-03-25 02:40:50
● 2026-03-25 07:35:48
○ 2026-03-25 11:10:08
○ 2026-03-25 21:23:16
● 2026-03-25 23:11:06
○ 2026-03-26 04:28:52
● 2026-03-26 07:43:48
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○ 2026-03-27 14:04:20
● 2026-03-27 14:39:52
○ 2026-03-27 21:24:12
○ 2026-06-21 20:29:12

○A3.164.206.322026-03-25 → 2026-03-27 · 13 obs

○A3.164.206.482026-03-25 → 2026-03-27 · 13 obs

○A3.164.206.802026-03-25 → 2026-03-27 · 13 obs

○A3.168.147.1032026-02-16 → 2026-03-22 · 17 obs

● 2026-02-16 10:13:50
○ 2026-02-19 16:15:06
○ 2026-02-20 05:52:08
● 2026-02-20 08:23:02
○ 2026-02-20 09:34:54
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● 2026-02-27 03:49:52
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○ 2026-03-07 09:40:50
● 2026-03-07 14:14:42
○ 2026-03-07 21:29:48
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● 2026-03-22 12:48:46
○ 2026-03-22 15:11:12
○ 2026-06-21 20:29:12

○A3.168.147.1042026-02-16 → 2026-03-22 · 17 obs

○A3.168.147.492026-02-16 → 2026-03-22 · 17 obs

○A3.168.147.662026-02-16 → 2026-03-22 · 17 obs

○A3.169.149.1182026-05-30 → 2026-05-31 · 10 obs

○ 2026-05-29 21:41:24
● 2026-05-30 01:39:30
○ 2026-05-30 03:21:10
○ 2026-05-30 05:48:42
● 2026-05-30 08:30:30
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● 2026-05-31 06:23:38
○ 2026-05-31 09:04:48
○ 2026-06-21 20:29:12

○A3.169.149.452026-05-30 → 2026-05-31 · 10 obs

○A3.169.149.582026-05-30 → 2026-05-31 · 10 obs

○A3.169.149.652026-05-30 → 2026-05-31 · 10 obs

○A3.170.185.462026-05-19 → 2026-06-08 · 19 obs

○ 2026-05-19 04:59:44
● 2026-05-19 11:06:48
○ 2026-05-19 14:25:36
● 2026-05-19 16:45:54
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● 2026-05-20 11:10:48
● 2026-05-25 09:52:24
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● 2026-05-27 22:11:02
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○ 2026-06-04 12:13:26
● 2026-06-05 00:45:34
● 2026-06-07 23:58:42
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● 2026-06-08 03:29:54
● 2026-06-08 06:51:42
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○ 2026-06-21 20:29:12

○A3.170.185.592026-05-19 → 2026-06-08 · 19 obs

○A3.170.185.762026-05-19 → 2026-06-08 · 19 obs

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

○A3.174.59.382026-04-06 → 2026-05-28 · 19 obs

○ 2026-04-04 19:19:38
● 2026-04-06 01:50:06
○ 2026-04-06 02:28:26
○ 2026-04-10 19:25:24
● 2026-04-11 00:12:50
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● 2026-05-13 18:05:56
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○ 2026-05-17 23:12:48
● 2026-05-18 08:18:38
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● 2026-05-19 04:59:44
○ 2026-05-19 11:06:48
○ 2026-05-28 18:36:12
● 2026-05-28 20:42:00
○ 2026-05-28 23:36:08
○ 2026-06-21 20:29:12

○A3.174.59.702026-04-06 → 2026-05-28 · 19 obs

○A3.174.59.782026-04-06 → 2026-05-28 · 19 obs

○A3.174.59.932026-04-06 → 2026-05-28 · 19 obs

○A3.174.83.272026-05-26 → 2026-06-08 · 19 obs

○ 2026-05-25 09:52:24
● 2026-05-26 11:18:16
○ 2026-05-26 12:15:26
○ 2026-05-26 17:37:44
● 2026-05-27 09:43:44
○ 2026-05-27 10:39:44
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● 2026-05-31 01:37:18
● 2026-06-01 14:57:28
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● 2026-06-03 15:05:42
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● 2026-06-04 12:13:26
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● 2026-06-08 02:01:02
○ 2026-06-08 03:29:54
○ 2026-06-21 20:29:12

○A3.174.83.312026-05-26 → 2026-06-08 · 19 obs

○A3.174.83.562026-05-26 → 2026-06-08 · 19 obs

○A3.174.83.592026-05-26 → 2026-06-08 · 19 obs

○A3.175.14.162026-04-09 → 2026-04-19 · 18 obs

○ 2026-04-06 02:28:26
● 2026-04-09 15:20:02
○ 2026-04-09 18:36:42
○ 2026-04-14 03:06:54
● 2026-04-14 05:55:42
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○ 2026-04-17 16:27:52
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○ 2026-04-18 21:11:28
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○ 2026-04-19 04:49:44
○ 2026-04-19 17:03:08
● 2026-04-19 19:18:34
○ 2026-04-19 20:37:12
○ 2026-06-21 20:29:12

○A3.175.14.282026-04-09 → 2026-04-19 · 18 obs

○A3.175.14.292026-04-09 → 2026-04-19 · 18 obs

○A3.175.14.642026-04-09 → 2026-04-19 · 18 obs

○A52.222.177.122026-02-19 → 2026-06-21 · 23 obs

○ 2026-02-19 16:15:06
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● 2026-02-20 05:10:48
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○ 2026-06-21 20:29:12

○A52.222.177.522026-02-19 → 2026-06-21 · 23 obs

○A52.222.177.532026-02-19 → 2026-06-21 · 23 obs

○A52.222.177.612026-02-19 → 2026-06-21 · 23 obs

○A52.85.61.612026-03-08 → 2026-03-14 · 9 obs

○ 2026-03-07 21:29:48
● 2026-03-08 00:11:22
○ 2026-03-08 06:29:52
○ 2026-03-14 07:46:14
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○ 2026-06-21 20:29:12

○A52.85.61.652026-03-08 → 2026-03-14 · 9 obs

○A52.85.61.972026-03-08 → 2026-03-14 · 9 obs

○A52.85.61.992026-03-08 → 2026-03-14 · 9 obs

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...	10 records
kupper.dev	ns-212.awsdns-26.com, ns-955.awsdns-55.net, ns-1084.awsdns-07.org, ns-1696.awsdns-20.co.uk	-

✅ Authoritative Response

Server:205.251.198.160

NS records: ns-212.awsdns-26.com, ns-955.awsdns-55.net, ns-1084.awsdns-07.org, ns-1696.awsdns-20.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for kupper.dev (unsigned zone)

⏱️ Timing

Total: 916ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`13.226.238.107, 13.226.238.83...`
NS	4	`ns-1084.awsdns-07.org, ns-1696.awsdns-20.co.uk...`
MX	2	`mail.protonmail.ch (pri: 10), mailsec.protonmail.ch (pri: 20)`
TXT	1	`protonmail-verification=d735cade84422284`
SOA	1	`ns-1084.awsdns-07.org awsdns-hostmaster.`

📌 Glue Records Collected

Total: 10

Out-of-bailiwick: 10 (ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com...)

Analysis

IP Addresses

kupper.dev points to the four IP addresses 13.226.238.76, 13.226.238.78, 13.226.238.83 and 13.226.238.107.

Additional host names — d1tyyrfe33juiw.cloudfront.net, dt29r6mgqiuua.cloudfront.net, unistyleinc.com and two others — share IP numbers with kupper.dev.

Name Servers

kupper.dev has four authoritative name servers: ns-212.awsdns-26.com, ns-955.awsdns-55.net, ns-1084.awsdns-07.org and ns-1696.awsdns-20.co.uk.

At least some of kupper.dev's name servers are shared with other domains, for example mountaintownfloralandgifts.com, phillipsonfamily.com, hanarikoumuten.com and two more.

Four hostnames, each resolving to a pair of IP addresses: ns-212.awsdns-26.com directs to 205.251.192.212 and 2600:9000:5300:d400::1; ns-955.awsdns-55.net directs to 205.251.195.187 and 2600:9000:5303:bb00::1; ns-1084.awsdns-07.org directs to 205.251.196.60 and 2600:9000:5304:3c00::1; ns-1696.awsdns-20.co.uk directs to 205.251.198.160 and 2600:9000:5306:a000::1.

Mail Servers

kupper.dev has two mail servers: mail.protonmail.ch and mailsec.protonmail.ch.

kupper.dev shares the same mail server setup as other domains, including egik.hu, secfo.org, simpletravels.com and two others.

kupper.dev shares mail servers — at least in part — with other domains, including jorgeoyola.com, ctxlaw.com, radheating.com and two others.

The hosts mail.protonmail.ch and mailsec.protonmail.ch both resolve to three IP numbers: mail.protonmail.ch to 176.119.200.128, 185.70.42.128 and 185.205.70.128, and mailsec.protonmail.ch to 176.119.200.129, 185.70.42.129 and 185.205.70.129.