certnet.work - dns.ninja

`certnet.work`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::ac43:93ac^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::6815:21b1^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.33.177^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.147.172^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`nucum.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:2691^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nucum.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c291^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`nucum.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2291^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`nucum.ns.cloudflare.com`
		A	108.162.194.145^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nucum.ns.cloudflare.com`
		A	162.159.38.145^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nucum.ns.cloudflare.com`
		A	172.64.34.145^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nucum.ns.cloudflare.com`
NS	`rustam.ns.cloudflare.com`
		A	2606:4700:58::a29f:2c94^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rustam.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c394^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`rustam.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2394^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`rustam.ns.cloudflare.com`
		A	108.162.195.148^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rustam.ns.cloudflare.com`
		A	162.159.44.148^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rustam.ns.cloudflare.com`
		A	172.64.35.148^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rustam.ns.cloudflare.com`
MX	`imail.certnet.work` ⭐
		A	185.75.21.21^{🇬🇧 UKSERVERS-AS185.75.20.0/23}
			PTR	`imail.certnet.work`
TXT	`v=spf1 +mx +a +ip4:185.75.21.21 +ip4:94.136.168.94 ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.33.177, 172.67.147.172
		IPv6 hints	2606:4700:3031::ac43:93ac, 2606:4700:3035::6815:21b1
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=171, name=cloudflare-ech.com
SOA	`nucum.ns.cloudflare.com`dns@cloudflare.com serial=2410777644

`work`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.nic.work` ⭐
	NS	`b.nic.work`
	NS	`c.nic.work`
	NS	`x.nic.work`
	NS	`y.nic.work`
	NS	`z.nic.work`
	SOA	`a.nic.work`admin@tldns.godaddy serial=1786764881

⚠️ On DNS blocklist: spam-tlds

Subdomains

imail.certnet.work

ns1.certnet.work

Same first word

certnet.work

certnet.ru

certnet.nl

certnet.ch

certnet.com.br

certnet.com

certnet.de

certnet.net

certnet.eu

Similar names

netcert.org

centter.com

tcentre.net

cnetter.net

certent.com

netcert.com

trecnet.com

certent.org

cternet.net

tcenter.com

tectren.com

tcenter.se

tencert.com

tcenter.co

tcentre.info

renttec.net

trentec.fi

recentt.com

trentec.de

tecrent.com

tecrent.de

cnetter.com

centret.se

tcenter.com.br

trecnet.it

renttec.de

tcenter.nl

centter.com.br

rentetc.com

centret.net

trecent.com

tnctree.net

tcenter.ru

trentec.net

centret.com

certent.net

renttec.com.br

tnctree.com

tnctree.co

netcert.net

trecnet.org

tcentre.ru

tcenter.it

tcenter.co.il

tcenter.at

trentec.com

tcentre.com

tcenter.de

DNS History

11 records (7 active, 4 former)

●NSnucum.ns.cloudflare.com2026-02-17 → 2026-08-15 · 2 obs

● 2026-02-17 22:15:56
● 2026-08-15 03:42:30

●NSrustam.ns.cloudflare.com2026-02-17 → 2026-08-15 · 2 obs

● 2026-02-17 22:15:56
● 2026-08-15 03:42:30

●MXimail.certnet.work2026-02-17 → 2026-08-15 · 2 obs

● 2026-02-17 22:15:56
● 2026-08-15 03:42:30

●A104.21.33.1772026-02-17 → 2026-08-15 · 5 obs

● 2026-02-17 22:15:56
● 2026-03-13 04:00:44
○ 2026-03-18 15:20:42
● 2026-03-18 16:41:20
● 2026-08-15 03:42:30

○A172.64.80.12026-03-18 → 2026-03-18 · 4 obs

○ 2026-03-13 04:00:44
● 2026-03-18 15:20:42
○ 2026-03-18 16:41:20
○ 2026-08-15 03:42:30

●A172.67.147.1722026-02-17 → 2026-08-15 · 5 obs

● 2026-02-17 22:15:56
● 2026-03-13 04:00:44
○ 2026-03-18 15:20:42
● 2026-03-18 16:41:20
● 2026-08-15 03:42:30

○A2606:4700:130:436c:6f75:6466:6c61:72652026-03-18 → 2026-03-18 · 4 obs

○ 2026-03-13 04:00:44
● 2026-03-18 15:20:42
○ 2026-03-18 16:41:20
○ 2026-08-15 03:42:30

●A2606:4700:3031::ac43:93ac2026-07-02 → 2026-08-15 · 3 obs

○ 2026-03-18 16:41:20
● 2026-07-02 18:50:04
● 2026-08-15 03:42:30

●A2606:4700:3035::6815:21b12026-07-02 → 2026-08-15 · 3 obs

○ 2026-03-18 16:41:20
● 2026-07-02 18:50:04
● 2026-08-15 03:42:30

○A2606:4700:3035::ac43:93ac2026-02-17 → 2026-03-18 · 6 obs

● 2026-02-17 22:15:56
● 2026-03-13 04:00:44
○ 2026-03-18 15:20:42
● 2026-03-18 16:41:20
○ 2026-07-02 18:50:04
○ 2026-08-15 03:42:30

○A2606:4700:3037::6815:21b12026-02-17 → 2026-03-18 · 6 obs

● 2026-02-17 22:15:56
● 2026-03-13 04:00:44
○ 2026-03-18 15:20:42
● 2026-03-18 16:41:20
○ 2026-07-02 18:50:04
○ 2026-08-15 03:42:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
work	a.nic.work, b.nic.work, c.nic.work, x.nic.work...	12 records
certnet.work	rustam.ns.cloudflare.com, nucum.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.195.148

NS records: rustam.ns.cloudflare.com, nucum.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for certnet.work (unsigned zone)

⏱️ Timing

Total: 627ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.147.172, 104.21.33.177`
AAAA	2	`2606:4700:3035::6815:21b1, 2606:4700:3031::ac43:93ac`
NS	2	`nucum.ns.cloudflare.com, rustam.ns.cloudflare.com`
MX	1	`imail.certnet.work (pri: 0)`
TXT	1	`v=spf1 +mx +a +ip4:185.75.21.21 +ip4:94.`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`nucum.ns.cloudflare.com dns.cloudflare.c`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (a.nic.work, a.nic.work, b.nic.work...)

Analysis

Hierarchy

imail.certnet.work and ns1.certnet.work each fall under certnet.work as their parent domain.

IP Addresses

certnet.work points to the four IP addresses 104.21.33.177, 172.67.147.172, 2606:4700:3031::ac43:93ac and 2606:4700:3035::6815:21b1.

Two other host names, along with syncvrmedical.de, 5-83-152-64.rltx.net and utahdnug.org, also share IP numbers with certnet.work.

Name Servers

certnet.work is served by two delegated name servers, nucum.ns.cloudflare.com and rustam.ns.cloudflare.com.

certnet.work shares its NS records with other domains, for example thewebcreative.com, ruiprime.cn, cultlight.com.br and two others.

At least some of certnet.work's name servers are shared with other domains, for example findmyukcasino.com, idea-lab.it, keyerealestate.com and two more.

It is common for these name servers to be used in conjunction with the name servers nelci.ns.cloudflare.com, cortney.ns.cloudflare.com and lloyd.ns.cloudflare.com.

DNS names with 6 IP addresses:

nucum.ns.cloudflare.com carries IP addresses 108.162.194.145, 162.159.38.145 and 172.64.34.145, with 3 other addresses beyond those.

rustam.ns.cloudflare.com carries IP addresses 108.162.195.148, 162.159.44.148 and 172.64.35.148, with 3 other addresses beyond those.

Mail Servers

The sole mail server for certnet.work is imail.certnet.work.

Mail server setup for certnet.work matches that of other domains, among them certnetworks.com.

certnet.work overlaps on mail servers with certain other domains, smartchaincoinmarket.com among them.

These mail servers often co-occur with the mail servers _dc-mx.372cc8ab9379.smartchaincoinmarket.com.

There is one IP number for imail.certnet.work: 185.75.21.21.