challengelearning.org - dns.ninja

`challengelearning.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:53cd^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3033::ac43:b54c^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.83.205^{Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.181.76^{🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`donna.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a97^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donna.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c097^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`donna.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2097^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`donna.ns.cloudflare.com`
		A	108.162.192.151^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donna.ns.cloudflare.com`
		A	172.64.32.151^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donna.ns.cloudflare.com`
		A	173.245.58.151^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donna.ns.cloudflare.com`
NS	`nash.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bd1^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nash.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1d1^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`nash.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21d1^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`nash.ns.cloudflare.com`
		A	108.162.193.209^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nash.ns.cloudflare.com`
		A	172.64.33.209^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nash.ns.cloudflare.com`
		A	173.245.59.209^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nash.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.83.205, 172.67.181.76
		IPv6 hints	2606:4700:3033::6815:53cd, 2606:4700:3033::ac43:b54c
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=163, name=cloudflare-ech.com
SOA	`donna.ns.cloudflare.com`dns@cloudflare.com serial=2410151230

`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=1786242569

WOT: SAFE (68/100)

Previously MX for

challengelearning.org

Same first word

challengelearning.nl

challengelearning.com

challengelearning.org

DNS History

26 records (6 active, 20 former)

○NSa.share-dns.com2026-03-22 → 2026-03-25 · 5 obs

○ 2019-04-12 22:21:24
● 2026-03-22 00:29:38
● 2026-03-25 07:25:44
○ 2026-04-09 09:52:18
○ 2026-08-09 03:02:34

○NSb.share-dns.net2026-03-22 → 2026-03-25 · 5 obs

○ 2019-04-12 22:21:24
● 2026-03-22 00:29:38
● 2026-03-25 07:25:44
○ 2026-04-09 09:52:18
○ 2026-08-09 03:02:34

○NSdns1.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

○NSdns2.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

●NSdonna.ns.cloudflare.com2026-04-09 → 2026-08-09 · 3 obs

○ 2026-03-25 07:25:44
● 2026-04-09 09:52:18
● 2026-08-09 03:02:34

●NSnash.ns.cloudflare.com2026-04-09 → 2026-08-09 · 3 obs

○ 2026-03-25 07:25:44
● 2026-04-09 09:52:18
● 2026-08-09 03:02:34

○NSns1.7cloudcomputing.com2015-11-15 → 2017-02-13 · 5 obs

○ 2015-06-30 08:09:42
● 2015-11-15 10:42:08
● 2017-02-13 16:22:48
○ 2019-04-12 22:21:24
○ 2026-08-09 03:02:34

○NSns1.challengelearning.org2015-06-30 → 2015-06-30 · 3 obs

● 2015-06-30 08:09:42
○ 2015-11-15 10:42:08
○ 2026-08-09 03:02:34

○NSns2.7cloudcomputing.com2015-11-15 → 2017-02-13 · 5 obs

○ 2015-06-30 08:09:42
● 2015-11-15 10:42:08
● 2017-02-13 16:22:48
○ 2019-04-12 22:21:24
○ 2026-08-09 03:02:34

○NSns2.challengelearning.org2015-06-30 → 2015-06-30 · 3 obs

● 2015-06-30 08:09:42
○ 2015-11-15 10:42:08
○ 2026-08-09 03:02:34

○MXchallengelearning.org2015-06-30 → 2017-02-13 · 4 obs

● 2015-06-30 08:09:42
● 2017-02-13 16:22:48
○ 2019-04-12 22:21:24
○ 2026-08-09 03:02:34

○MXeforward1.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

○MXeforward2.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

○MXeforward3.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

○MXeforward4.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

○MXeforward5.registrar-servers.com2019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

●A104.21.83.2052026-04-09 → 2026-08-09 · 3 obs

○ 2026-03-25 07:25:44
● 2026-04-09 09:52:18
● 2026-08-09 03:02:34

○A104.216.111.412019-04-12 → 2019-04-12 · 4 obs

○ 2017-02-13 16:22:48
● 2019-04-12 22:21:24
○ 2026-03-22 00:29:38
○ 2026-08-09 03:02:34

○A129.121.14.1032015-11-15 → 2017-02-13 · 5 obs

○ 2015-06-30 08:09:42
● 2015-11-15 10:42:08
● 2017-02-13 16:22:48
○ 2019-04-12 22:21:24
○ 2026-08-09 03:02:34

●A172.67.181.762026-04-09 → 2026-08-09 · 3 obs

○ 2026-03-25 07:25:44
● 2026-04-09 09:52:18
● 2026-08-09 03:02:34

●A2606:4700:3033::6815:53cd2026-07-04 → 2026-08-09 · 3 obs

○ 2026-06-01 21:31:18
● 2026-07-04 01:50:16
● 2026-08-09 03:02:34

●A2606:4700:3033::ac43:b54c2026-07-04 → 2026-08-09 · 3 obs

○ 2026-06-01 21:31:18
● 2026-07-04 01:50:16
● 2026-08-09 03:02:34

○A2606:4700:3036::ac43:b54c2026-04-09 → 2026-06-01 · 5 obs

○ 2026-03-25 07:25:44
● 2026-04-09 09:52:18
● 2026-06-01 21:31:18
○ 2026-07-04 01:50:16
○ 2026-08-09 03:02:34

○A2606:4700:3037::6815:53cd2026-04-09 → 2026-06-01 · 5 obs

○ 2026-03-25 07:25:44
● 2026-04-09 09:52:18
● 2026-06-01 21:31:18
○ 2026-07-04 01:50:16
○ 2026-08-09 03:02:34

○A61.14.227.1622026-03-22 → 2026-03-25 · 5 obs

○ 2019-04-12 22:21:24
● 2026-03-22 00:29:38
● 2026-03-25 07:25:44
○ 2026-04-09 09:52:18
○ 2026-08-09 03:02:34

○A69.56.215.1662015-06-30 → 2015-06-30 · 3 obs

● 2015-06-30 08:09:42
○ 2015-11-15 10:42:08
○ 2026-08-09 03:02:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org	-
challengelearning.org	donna.ns.cloudflare.com, nash.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.193.209

NS records: donna.ns.cloudflare.com, nash.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for challengelearning.org (unsigned zone)

⏱️ Timing

Total: 629ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.181.76, 104.21.83.205`
AAAA	2	`2606:4700:3033::ac43:b54c, 2606:4700:3033::6815:53cd`
NS	2	`donna.ns.cloudflare.com, nash.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`donna.ns.cloudflare.com dns.cloudflare.c`

Analysis

IP Addresses

challengelearning.org points to the four IP addresses 104.21.83.205, 172.67.181.76, 2606:4700:3033::6815:53cd and 2606:4700:3033::ac43:b54c.

Additional host names — selffixer.com, www.you-it.com, quintheravoxa.com and two others — share IP numbers with challengelearning.org.

Name Servers

DNS delegation for challengelearning.org points to two name servers: donna.ns.cloudflare.com and nash.ns.cloudflare.com.

challengelearning.org shares its name server setup with other domains, including artistape.com, 311614.com, hsjiameida.com and two others.

The name servers of challengelearning.org overlap at least partially with those of other domains — among them sultan33i.lat, torridlust.com, racinesoftinc.com and two more.

These name servers commonly appear in delegations together with meiling.ns.cloudflare.com, moura.ns.cloudflare.com, bayan.ns.cloudflare.com and 3 other.

Host names with 6 IP numbers:

donna.ns.cloudflare.com has IP addresses 108.162.192.151, 172.64.32.151 and 173.245.58.151, plus 3 other.

nash.ns.cloudflare.com has IP addresses 108.162.193.209, 172.64.33.209 and 173.245.59.209, plus 3 other.