`challengeclass.kr`

DNSSEC	⚠️ Not signed
A	183.111.139.231^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
A	183.111.139.235^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
A	203.245.12.109^{🇰🇷 KT-NET203.245.0.0/18 contact chejumen@hitel.net if necessary contact country1@hitel.net if necessary contact express@hitel.net if necessary contact ezmate@hitel.net if necessary contact han322@hitel.net if necessary}
A	210.114.23.166^{🇰🇷 KT-NET210.114.0.0/18 contact chejumen@hitel.net if necessary contact country1@hitel.net if necessary contact express@hitel.net if necessary contact ezmate@hitel.net if necessary contact han322@hitel.net if necessary}
NS	`challengeclass.kr` ⭐
		A	183.111.139.231^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
		A	183.111.139.235^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
		A	203.245.12.109^{🇰🇷 KT-NET203.245.0.0/18 contact chejumen@hitel.net if necessary contact country1@hitel.net if necessary contact express@hitel.net if necessary contact ezmate@hitel.net if necessary contact han322@hitel.net if necessary}
		A	210.114.23.166^{🇰🇷 KT-NET210.114.0.0/18 contact chejumen@hitel.net if necessary contact country1@hitel.net if necessary contact express@hitel.net if necessary contact ezmate@hitel.net if necessary contact han322@hitel.net if necessary}
NS	`ns-1106.cafe24.com`
		A	1.234.0.20^{🇰🇷 SKB-NET1.232.0.0/13 auto-generated route object for 1.232.0.0/13}
NS	`ns-1214.cafe24.com`
		A	175.125.93.184^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
NS	`ns-2122.cafe24.com`
		A	112.175.11.55^{🇰🇷 KT-NET112.168.0.0/13}
NS	`ns-2230.cafe24.com`
		A	1.234.0.68^{🇰🇷 SKB-NET1.232.0.0/13 auto-generated route object for 1.232.0.0/13}
MX	`smtp.google.com` ⭐
		A	2607:f8b0:4004:c17::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bl-in-f26.1e100.net`
		A	2607:f8b0:4004:c17::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bl-in-f27.1e100.net`
		A	2607:f8b0:4004:c19::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bk-in-f26.1e100.net`
		A	2607:f8b0:4004:c23::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`yuiadrs-in-f26.1e100.net`
		A	142.251.16.26^{🇺🇸 Google142.251.16.0/24}
			PTR	`bl-in-f26.1e100.net`
		A	142.251.16.27^{🇺🇸 Google142.251.16.0/24}
			PTR	`bl-in-f27.1e100.net`
		A	142.251.111.27^{🇺🇸 Google142.251.111.0/24}
			PTR	`bk-in-f27.1e100.net`
		A	192.178.155.26^{🇺🇸 Google192.178.155.0/24}
			PTR	`yuiadrs-in-f26.1e100.net`
		A	192.178.155.27^{🇺🇸 Google192.178.155.0/24}
			PTR	`yuiadrs-in-f27.1e100.net`
TXT	`google-site-verification=FhXn7QTi3ahpINTAuM98vBosZ3DdI8BF-mK25K-5UiI`
TXT	`google-site-verification=weBhtFNw7L2XxfZhiWEzRkQVf8T05nPtEIUDt3jLtYY`
SOA	`challengeclass.kr`postmaster@challengeclass.kr serial=20251126

`kr`

	DNSSEC	⚠️ Not signed
	NS	`g.dns.kr` ⭐
	NS	`b.dns.kr`
	NS	`c.dns.kr`
	NS	`d.dns.kr`
	NS	`e.dns.kr`
	NS	`f.dns.kr`
	SOA	`g.dns.kr`domain-manager@nic.or.kr serial=2607150770

📈 Tranco rank: #764,081

NS for

challengeclass.kr

Same first word

challengeclass.kr

DNS History

10 records (10 active, 0 former)

●NSchallengeclass.kr2026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●NSns-1106.cafe24.com2026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●NSns-1214.cafe24.com2026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●NSns-2122.cafe24.com2026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●NSns-2230.cafe24.com2026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●MXsmtp.google.com2026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●A183.111.139.2312026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●A183.111.139.2352026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●A203.245.12.1092026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

●A210.114.23.1662026-06-13 → 2026-07-15 · 2 obs

● 2026-06-13 08:46:04
● 2026-07-15 07:36:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
kr	d.dns.kr, e.dns.kr, f.dns.kr, g.dns.kr...	-
challengeclass.kr	ns-1214.cafe24.com, ns-2122.cafe24.com, ns-2230.cafe24.com, ns-1106.cafe24.com	-

✅ Authoritative Response

Server:175.125.93.184

NS records: ns-1214.cafe24.com, ns-2122.cafe24.com, ns-2230.cafe24.com, ns-1106.cafe24.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for challengeclass.kr (unsigned zone)

⏱️ Timing

Total: 2263ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`203.245.12.109, 183.111.139.235...`
NS	4	`ns-1106.cafe24.com, ns-1214.cafe24.com...`
MX	1	`SMTP.GOOGLE.COM (pri: 1)`
TXT	2	`google-site-verification=weBhtFNw7L2XxfZ, google-site-verification=FhXn7QTi3ahpINT`
SOA	1	`challengeclass.kr postmaster.challengecl`

Analysis

Name Server Role

challengeclass.kr has challengeclass.kr as one of its name servers, making it self-hosted for DNS delegation.

Together with challengeclass.kr, the hosts ns-1106.cafe24.com, ns-1214.cafe24.com and ns-2122.cafe24.com are frequently configured as name servers.

IP Addresses

challengeclass.kr directs to four IP numbers, which are 183.111.139.231, 183.111.139.235, 203.245.12.109 and 210.114.23.166.

Among the host names that share IP numbers with challengeclass.kr are 55studio.co.kr, dias.co.kr, luvid.co.kr and two others.

Name Servers

DNS for challengeclass.kr is delegated to five name servers: challengeclass.kr, ns-1106.cafe24.com, ns-1214.cafe24.com and two others.

There is at least partial name server overlap between challengeclass.kr and other domains — afrernic.com, gnfit.kr, smallbig.kr and two more among them.

These name servers regularly appear alongside ns-2230.cafe24.com, ns2.cafe24.com, ns1.cafe24.com and 7 other name servers in NS record sets.

Hosts pointing to four IP addresses:

challengeclass.kr resolves to four IP addresses — 183.111.139.231, 183.111.139.235, 203.245.12.109 and 210.114.23.166.

Hosts that resolve to one IP address:

ns-1106.cafe24.com points to 1.234.0.20.

ns-1214.cafe24.com points to 175.125.93.184.

ns-2122.cafe24.com points to 112.175.11.55.

ns-2230.cafe24.com points to 1.234.0.68.

Mail Servers

challengeclass.kr routes its mail through a single mail server, smtp.google.com.

challengeclass.kr has the same mail server arrangement as a number of other domains, for example erpool.com, goreg.co.uk, alt1.aspmx.l.google.com.kirov.it and two more.

challengeclass.kr shares at least some of its mail servers with other domains — for example difose.com.tr, avid.live, egroup.id and two more.

smtp.google.com directs to 9 IP numbers, including 142.251.16.26, 142.251.16.27 and 142.251.111.27, along with 6 other.

challengeclass.kr - robtex.com