cu21.net - dns.ninja

`cu21.net`

DNSSEC	⚠️ Not signed
A	183.111.139.227^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
A	183.111.139.230^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
A	203.245.12.124^{🇰🇷 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	210.114.23.162^{🇰🇷 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	`cu21.net` ⭐
		A	183.111.139.227^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
		A	183.111.139.230^{🇰🇷 KT-NET183.104.0.0/13 KORNET KOREA TELECOM}
		A	203.245.12.124^{🇰🇷 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	210.114.23.162^{🇰🇷 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	`dns1.cafe24.co.kr`
		A	112.175.246.228^{🇰🇷 KT-NET112.168.0.0/13}
		A	112.175.246.229^{🇰🇷 KT-NET112.168.0.0/13}
		A	175.125.93.132^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
		A	175.125.93.133^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
NS	`dns1.cafe24.com`
		A	112.175.246.226^{🇰🇷 KT-NET112.168.0.0/13}
		A	112.175.246.227^{🇰🇷 KT-NET112.168.0.0/13}
		A	175.125.93.130^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
		A	175.125.93.131^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
NS	`dns2.cafe24.co.kr` ⚠️ Not in parent delegation
		A	112.175.247.228^{🇰🇷 KT-NET112.168.0.0/13}
		A	112.175.247.229^{🇰🇷 KT-NET112.168.0.0/13}
		A	175.125.93.142^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
		A	175.125.93.143^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
NS	`dns2.cafe24.com` ⚠️ Not in parent delegation
		A	112.175.247.226^{🇰🇷 KT-NET112.168.0.0/13}
		A	112.175.247.227^{🇰🇷 KT-NET112.168.0.0/13}
		A	175.125.93.140^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
		A	175.125.93.141^{🇰🇷 SKB-NET175.120.0.0/13 SKB summary}
SOA	`cu21.net`postmaster@cu21.net serial=20230708

`net`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1785710387

NS for

cu21.net

Same first word

cu21.net

Similar names

12uc.com

1c2u.com

1c2u.ru

21uc.com

cu12.ac.kr

21cu.net

12cu.com

cu12.com

uc21.com

u2c1.com

u21c.com

c21u.com

u21c.vip

21cu.com.cn

12uc.de

DNS History

15 records (9 active, 6 former)

●NScu21.net2016-03-31 → 2026-08-02 · 3 obs

○ 2015-10-19 20:21:38
● 2016-03-31 14:04:30
● 2026-08-02 22:56:36

○NSdns01.muumuu-domain.com2016-03-31 → 2017-03-27 · 5 obs

○ 2015-10-19 20:21:38
● 2016-03-31 14:04:30
● 2017-03-27 03:34:22
○ 2026-03-07 23:27:46
○ 2026-08-02 22:56:36

○NSdns02.muumuu-domain.com2016-03-31 → 2017-03-27 · 5 obs

○ 2015-10-19 20:21:38
● 2016-03-31 14:04:30
● 2017-03-27 03:34:22
○ 2026-03-07 23:27:46
○ 2026-08-02 22:56:36

●NSdns1.cafe24.co.kr2026-03-07 → 2026-08-02 · 3 obs

○ 2017-03-27 03:34:22
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

●NSdns1.cafe24.com2026-03-07 → 2026-08-02 · 3 obs

○ 2017-03-27 03:34:22
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

●NSdns2.cafe24.co.kr2026-03-07 → 2026-08-02 · 3 obs

○ 2017-03-27 03:34:22
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

●NSdns2.cafe24.com2026-03-07 → 2026-08-02 · 3 obs

○ 2017-03-27 03:34:22
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

○NSns1.dns-diy.com2007-09-21 → 2007-09-21 · 3 obs

● 2007-09-21 13:10:20
○ 2015-10-19 20:21:38
○ 2026-08-02 22:56:36

○NSns2.dns-diy.com2007-09-21 → 2007-09-21 · 3 obs

● 2007-09-21 13:10:20
○ 2015-10-19 20:21:38
○ 2026-08-02 22:56:36

●A183.111.139.2272026-03-07 → 2026-08-02 · 3 obs

○ 2015-10-19 20:21:38
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

●A183.111.139.2302026-03-07 → 2026-08-02 · 3 obs

○ 2015-10-19 20:21:38
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

●A203.245.12.1242026-03-07 → 2026-08-02 · 3 obs

○ 2015-10-19 20:21:38
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

●A210.114.23.1622026-03-07 → 2026-08-02 · 3 obs

○ 2015-10-19 20:21:38
● 2026-03-07 23:27:46
● 2026-08-02 22:56:36

○A218.85.134.1462007-09-21 → 2007-09-21 · 3 obs

● 2007-09-21 13:10:20
○ 2015-10-19 20:21:38
○ 2026-08-02 22:56:36

○A61.55.139.72007-09-21 → 2007-09-21 · 3 obs

● 2007-09-21 13:10:20
○ 2015-10-19 20:21:38
○ 2026-08-02 22:56:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
net	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
cu21.net	dns1.cafe24.com, dns1.cafe24.co.kr	-

✅ Authoritative Response

Server:112.175.246.229

NS records: dns1.cafe24.com, dns1.cafe24.co.kr

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cu21.net (unsigned zone)

⏱️ Timing

Total: 4222ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`183.111.139.227, 210.114.23.162...`
NS	4	`dns1.cafe24.co.kr, dns2.cafe24.co.kr...`
SOA	1	`cu21.net postmaster.cu21.net`

Analysis

Name Server Role

cu21.net acts as a name server for cu21.net, meaning it is self-referentially delegated.

cu21.net is commonly paired with dns1.cafe24.com, dns2.cafe24.com and dns1.cafe24.co.kr to act as name servers.

IP Addresses

cu21.net directs to four IP numbers, which are 183.111.139.227, 183.111.139.230, 203.245.12.124 and 210.114.23.162.

labelmall.kr, thegelnail.com, healinghat.com and two other host names share IP numbers with cu21.net.

Name Servers

Five name servers are authoritative for cu21.net, which are cu21.net, dns1.cafe24.com, dns2.cafe24.com and two others.

The name servers of cu21.net overlap at least partially with those of other domains — among them wtd.co.kr, cocoenu.com, bpet.co.kr and two more.

These name servers commonly appear in delegations together with dns2.cafe24.co.kr, ns2.cafe24.com, ns1.cafe24.com and 4 other.

Hosts that point to four IP numbers:

cu21.net resolves to 183.111.139.227, 183.111.139.230, 203.245.12.124 and 210.114.23.162.

dns1.cafe24.com resolves to 112.175.246.226, 112.175.246.227, 175.125.93.130 and 175.125.93.131.

dns2.cafe24.com resolves to 112.175.247.226, 112.175.247.227, 175.125.93.140 and 175.125.93.141.

dns1.cafe24.co.kr resolves to 112.175.246.228, 112.175.246.229, 175.125.93.132 and 175.125.93.133.

dns2.cafe24.co.kr resolves to 112.175.247.228, 112.175.247.229, 175.125.93.142 and 175.125.93.143.