problemset.org - dns.ninja

`problemset.org`

DNSSEC	⚠️ Not signed
A	13.226.209.20^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
		PTR	`server-13-226-209-20.iad61.r.cloudfront.net`
A	13.226.209.81^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
A	13.226.209.84^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
A	13.226.209.117^{🇺🇸 Amazon13.226.209.0/24 - Cloudfront}
NS	`ns-296.awsdns-37.com` ⭐
		A	2600:9000:5301:2800::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-296.awsdns-37.com`
		A	205.251.193.40^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-296.awsdns-37.com`
NS	`ns-1101.awsdns-09.org`
		A	2600:9000:5304:4d00::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1101.awsdns-09.org`
		A	205.251.196.77^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1101.awsdns-09.org`
NS	`ns-1841.awsdns-38.co.uk`
		A	2600:9000:5307:3100::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-1841.awsdns-38.co.uk`
		A	205.251.199.49^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-1841.awsdns-38.co.uk`
NS	`ns-997.awsdns-60.net`
		A	2600:9000:5303:e500::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-997.awsdns-60.net`
		A	205.251.195.229^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-997.awsdns-60.net`
SOA	`ns-296.awsdns-37.com`awsdns-hostmaster@amazon.com serial=1

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1783798250

Same first word

problemset.org

DNS History

76 records (8 active, 68 former)

●NSns-1101.awsdns-09.org2026-02-19 → 2026-07-11 · 2 obs

● 2026-02-19 15:17:00
● 2026-07-11 19:38:34

●NSns-1841.awsdns-38.co.uk2026-02-19 → 2026-07-11 · 2 obs

● 2026-02-19 15:17:00
● 2026-07-11 19:38:34

●NSns-296.awsdns-37.com2026-02-19 → 2026-07-11 · 2 obs

● 2026-02-19 15:17:00
● 2026-07-11 19:38:34

●NSns-997.awsdns-60.net2026-02-19 → 2026-07-11 · 2 obs

● 2026-02-19 15:17:00
● 2026-07-11 19:38:34

○A108.139.113.1112026-04-14 → 2026-06-07 · 13 obs

○ 2026-04-14 01:02:06
● 2026-04-14 13:16:34
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● 2026-04-15 10:43:40
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● 2026-04-16 14:44:26
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○ 2026-06-07 20:28:36
● 2026-06-07 22:04:08
○ 2026-06-07 22:58:06
○ 2026-07-11 19:38:34

○A108.139.113.1172026-04-14 → 2026-06-07 · 13 obs

○A108.139.113.42026-04-14 → 2026-06-07 · 13 obs

○A108.139.113.882026-04-14 → 2026-06-07 · 13 obs

○A108.157.142.362026-06-03 → 2026-06-03 · 4 obs

○ 2026-06-02 04:48:00
● 2026-06-03 03:20:28
○ 2026-06-03 04:19:54
○ 2026-07-11 19:38:34

○A108.157.142.422026-06-03 → 2026-06-03 · 4 obs

○ 2026-06-02 04:48:00
● 2026-06-03 03:20:28
○ 2026-06-03 04:19:54
○ 2026-07-11 19:38:34

○A108.157.142.612026-06-03 → 2026-06-03 · 4 obs

○ 2026-06-02 04:48:00
● 2026-06-03 03:20:28
○ 2026-06-03 04:19:54
○ 2026-07-11 19:38:34

○A108.157.142.82026-06-03 → 2026-06-03 · 4 obs

○ 2026-06-02 04:48:00
● 2026-06-03 03:20:28
○ 2026-06-03 04:19:54
○ 2026-07-11 19:38:34

○A108.158.137.1172026-04-11 → 2026-07-03 · 28 obs

○ 2026-04-05 12:23:12
● 2026-04-11 00:12:18
○ 2026-04-11 01:19:12
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● 2026-05-18 14:26:08
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● 2026-07-01 22:29:02
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○ 2026-07-11 19:38:34

○A108.158.137.392026-04-11 → 2026-07-03 · 28 obs

○A108.158.137.62026-04-11 → 2026-07-03 · 28 obs

○A108.158.137.852026-04-11 → 2026-07-03 · 28 obs

○A13.224.95.192026-02-20 → 2026-06-30 · 52 obs

○ 2026-02-19 15:17:00
● 2026-02-20 11:03:08
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● 2026-06-25 12:25:28
○ 2026-06-26 03:37:48
● 2026-06-26 05:48:20
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● 2026-06-27 11:06:04
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● 2026-06-28 01:30:36
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○ 2026-06-29 04:56:08
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● 2026-06-30 11:41:14
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● 2026-06-30 21:56:08
○ 2026-07-01 00:38:12
○ 2026-07-11 19:38:34

○A13.224.95.512026-02-20 → 2026-06-30 · 52 obs

○A13.224.95.692026-02-20 → 2026-06-30 · 52 obs

○A13.224.95.852026-02-20 → 2026-06-30 · 52 obs

●A13.226.209.1172026-02-22 → 2026-07-11 · 58 obs

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

●A13.226.209.202026-02-22 → 2026-07-11 · 58 obs

●A13.226.209.812026-02-22 → 2026-07-11 · 58 obs

●A13.226.209.842026-02-22 → 2026-07-11 · 58 obs

○A13.249.126.1112026-07-04 → 2026-07-09 · 10 obs

○ 2026-07-03 13:00:38
● 2026-07-04 04:16:20
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○ 2026-07-11 19:38:34

○A13.249.126.1202026-07-04 → 2026-07-09 · 10 obs

○A13.249.126.692026-07-04 → 2026-07-09 · 10 obs

○A13.249.126.732026-07-04 → 2026-07-09 · 10 obs

○A13.33.109.1012026-04-21 → 2026-05-21 · 25 obs

○ 2026-04-21 01:49:32
● 2026-04-21 09:25:32
○ 2026-04-21 11:31:42
○ 2026-04-21 12:55:20
● 2026-04-21 14:15:40
○ 2026-04-22 18:48:22
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○ 2026-05-21 05:49:14
○ 2026-07-11 19:38:34

○A13.33.109.622026-04-21 → 2026-05-21 · 25 obs

○A13.33.109.792026-04-21 → 2026-05-21 · 25 obs

○A13.33.109.872026-04-21 → 2026-05-21 · 25 obs

○A13.33.82.132026-05-07 → 2026-05-07 · 4 obs

○ 2026-05-06 23:27:20
● 2026-05-07 11:04:40
○ 2026-05-07 19:26:30
○ 2026-07-11 19:38:34

○A13.33.82.272026-05-07 → 2026-05-07 · 4 obs

○ 2026-05-06 23:27:20
● 2026-05-07 11:04:40
○ 2026-05-07 19:26:30
○ 2026-07-11 19:38:34

○A13.33.82.632026-05-07 → 2026-05-07 · 4 obs

○ 2026-05-06 23:27:20
● 2026-05-07 11:04:40
○ 2026-05-07 19:26:30
○ 2026-07-11 19:38:34

○A13.33.82.942026-05-07 → 2026-05-07 · 4 obs

○ 2026-05-06 23:27:20
● 2026-05-07 11:04:40
○ 2026-05-07 19:26:30
○ 2026-07-11 19:38:34

○A18.155.107.282026-05-28 → 2026-06-05 · 24 obs

○ 2026-05-21 05:49:14
● 2026-05-28 13:39:42
○ 2026-05-28 14:48:50
○ 2026-05-29 08:49:20
● 2026-05-29 09:27:56
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○A18.155.107.322026-05-28 → 2026-06-05 · 24 obs

○A18.155.107.672026-05-28 → 2026-06-05 · 24 obs

○A18.155.107.702026-05-28 → 2026-06-05 · 24 obs

○A18.160.41.1292026-04-19 → 2026-04-20 · 6 obs

○ 2026-04-16 17:22:54
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● 2026-04-20 00:27:54
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○ 2026-07-11 19:38:34

○A18.160.41.42026-04-19 → 2026-04-20 · 6 obs

○ 2026-04-16 17:22:54
● 2026-04-19 06:45:44
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● 2026-04-20 00:27:54
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○ 2026-07-11 19:38:34

○A18.160.41.702026-04-19 → 2026-04-20 · 6 obs

○ 2026-04-16 17:22:54
● 2026-04-19 06:45:44
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○A18.160.41.852026-04-19 → 2026-04-20 · 6 obs

○ 2026-04-16 17:22:54
● 2026-04-19 06:45:44
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○A3.164.206.102026-07-11 → 2026-07-11 · 4 obs

○ 2026-07-11 09:44:48
● 2026-07-11 10:22:44
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○ 2026-07-11 19:38:34

○A3.164.206.732026-07-11 → 2026-07-11 · 4 obs

○ 2026-07-11 09:44:48
● 2026-07-11 10:22:44
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○A3.164.206.852026-07-11 → 2026-07-11 · 4 obs

○ 2026-07-11 09:44:48
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○A3.164.206.882026-07-11 → 2026-07-11 · 4 obs

○ 2026-07-11 09:44:48
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○A3.166.135.42026-06-17 → 2026-06-17 · 4 obs

○ 2026-06-16 16:33:00
● 2026-06-17 10:07:48
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○ 2026-07-11 19:38:34

○A3.166.135.532026-06-17 → 2026-06-17 · 4 obs

○ 2026-06-16 16:33:00
● 2026-06-17 10:07:48
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○A3.166.135.562026-06-17 → 2026-06-17 · 4 obs

○ 2026-06-16 16:33:00
● 2026-06-17 10:07:48
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○A3.166.135.912026-06-17 → 2026-06-17 · 4 obs

○ 2026-06-16 16:33:00
● 2026-06-17 10:07:48
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○A3.167.163.1072026-05-19 → 2026-07-02 · 33 obs

○ 2026-05-18 14:56:34
● 2026-05-19 12:49:06
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○ 2026-07-11 19:38:34

○A3.167.163.112026-05-19 → 2026-07-02 · 33 obs

○A3.167.163.622026-05-19 → 2026-07-02 · 33 obs

○A3.167.163.852026-05-19 → 2026-07-02 · 33 obs

○A3.168.122.1172026-03-07 → 2026-03-14 · 7 obs

○ 2026-03-07 01:01:12
● 2026-03-07 23:54:50
○ 2026-03-08 06:50:28
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● 2026-03-14 14:22:38
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○ 2026-07-11 19:38:34

○A3.168.122.222026-03-07 → 2026-03-14 · 7 obs

○ 2026-03-07 01:01:12
● 2026-03-07 23:54:50
○ 2026-03-08 06:50:28
○ 2026-03-14 12:31:58
● 2026-03-14 14:22:38
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○A3.168.122.822026-03-07 → 2026-03-14 · 7 obs

○ 2026-03-07 01:01:12
● 2026-03-07 23:54:50
○ 2026-03-08 06:50:28
○ 2026-03-14 12:31:58
● 2026-03-14 14:22:38
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○ 2026-07-11 19:38:34

○A3.168.122.932026-03-07 → 2026-03-14 · 7 obs

○ 2026-03-07 01:01:12
● 2026-03-07 23:54:50
○ 2026-03-08 06:50:28
○ 2026-03-14 12:31:58
● 2026-03-14 14:22:38
○ 2026-03-14 16:16:42
○ 2026-07-11 19:38:34

○A3.174.83.252026-03-28 → 2026-07-11 · 47 obs

○ 2026-03-19 09:11:40
● 2026-03-28 11:39:06
● 2026-03-28 15:03:00
○ 2026-03-28 21:54:06
● 2026-03-29 00:11:08
● 2026-03-30 01:19:36
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○A3.174.83.482026-03-28 → 2026-07-11 · 47 obs

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○A52.84.20.1062026-02-19 → 2026-03-19 · 23 obs

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🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org	-
problemset.org	ns-1841.awsdns-38.co.uk, ns-997.awsdns-60.net, ns-296.awsdns-37.com, ns-1101.awsdns-09.org	2 records

✅ Authoritative Response

Server:205.251.196.77

NS records: ns-1841.awsdns-38.co.uk, ns-997.awsdns-60.net, ns-296.awsdns-37.com, ns-1101.awsdns-09.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for problemset.org (unsigned zone)

⏱️ Timing

Total: 2126ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`13.226.209.84, 13.226.209.117...`
NS	4	`ns-1101.awsdns-09.org, ns-1841.awsdns-38.co.uk...`
SOA	1	`ns-296.awsdns-37.com awsdns-hostmaster.a`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-1101.awsdns-09.org, ns-1101.awsdns-09.org)

Analysis

IP Addresses

problemset.org points to the four IP addresses 13.226.209.20, 13.226.209.81, 13.226.209.84 and 13.226.209.117.

Name Servers

problemset.org has four authoritative name servers: ns-296.awsdns-37.com, ns-997.awsdns-60.net, ns-1101.awsdns-09.org and ns-1841.awsdns-38.co.uk.

At least some of problemset.org's name servers are shared with other domains, for example braw.com.au, obsekium.com.br, live-a-live.com and two more.

These name servers tend to co-occur with ns-537.awsdns-03.net, ns-1344.awsdns-40.org, ns-1622.awsdns-10.co.uk and 3 other name servers in the same DNS delegations.

Four hostnames, each resolving to a pair of IP addresses: ns-296.awsdns-37.com directs to 205.251.193.40 and 2600:9000:5301:2800::1; ns-997.awsdns-60.net directs to 205.251.195.229 and 2600:9000:5303:e500::1; ns-1101.awsdns-09.org directs to 205.251.196.77 and 2600:9000:5304:4d00::1; ns-1841.awsdns-38.co.uk directs to 205.251.199.49 and 2600:9000:5307:3100::1.