`51cdu.com`

DNSSEC	⚠️ Not signed
A	118.25.105.96^{🇨🇳 TENCENT-NET-AP118.25.104.0/22}
NS	`elijah.ns.cloudflare.com` ⭐
		A	2606:4700:58::a29f:2cfd^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elijah.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c3fd^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`elijah.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:23fd^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`elijah.ns.cloudflare.com`
		A	108.162.195.253^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elijah.ns.cloudflare.com`
		A	162.159.44.253^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elijah.ns.cloudflare.com`
		A	172.64.35.253^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elijah.ns.cloudflare.com`
NS	`kehlani.ns.cloudflare.com`
		A	2606:4700:50::a29f:26df^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kehlani.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2df^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`kehlani.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22df^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`kehlani.ns.cloudflare.com`
		A	108.162.194.223^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kehlani.ns.cloudflare.com`
		A	162.159.38.223^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kehlani.ns.cloudflare.com`
		A	172.64.34.223^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kehlani.ns.cloudflare.com`
MX	`route3.mx.cloudflare.net` ⭐
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
MX	`route1.mx.cloudflare.net`⁽⁴³⁾
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
MX	`route2.mx.cloudflare.net`⁽⁶⁷⁾
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
TXT	`v=spf1 include:_spf.mx.cloudflare.net ~all`
SOA	`elijah.ns.cloudflare.com`dns@cloudflare.com serial=2401395160

`com`

	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=1778762241

Subdomains

www.51cdu.com

Same first word

51cdu.com

Similar names

cd51u.com

15duc.top

DNS History

13 records (6 active, 7 former)

●NSelijah.ns.cloudflare.com2026-02-27 → 2026-05-14 · 3 obs

○ 2016-11-27 05:13:30
● 2026-02-27 13:13:58
● 2026-05-14 12:39:40

●NSkehlani.ns.cloudflare.com2026-02-27 → 2026-05-14 · 3 obs

○ 2016-11-27 05:13:30
● 2026-02-27 13:13:58
● 2026-05-14 12:39:40

○NSns.95ns.com2015-05-23 → 2016-11-27 · 4 obs

● 2015-05-23 18:08:02
● 2016-11-27 05:13:30
○ 2026-02-27 13:13:58
○ 2026-05-14 12:39:40

○NSns.95ns.net2015-05-23 → 2016-11-27 · 4 obs

● 2015-05-23 18:08:02
● 2016-11-27 05:13:30
○ 2026-02-27 13:13:58
○ 2026-05-14 12:39:40

○MXmxbiz1.qq.com2015-05-23 → 2016-11-27 · 4 obs

● 2015-05-23 18:08:02
● 2016-11-27 05:13:30
○ 2026-02-27 13:13:58
○ 2026-05-14 12:39:40

○MXmxbiz2.qq.com2015-05-23 → 2016-11-27 · 4 obs

● 2015-05-23 18:08:02
● 2016-11-27 05:13:30
○ 2026-02-27 13:13:58
○ 2026-05-14 12:39:40

●MXroute1.mx.cloudflare.net2026-02-27 → 2026-05-14 · 3 obs

○ 2016-11-27 05:13:30
● 2026-02-27 13:13:58
● 2026-05-14 12:39:40

●MXroute2.mx.cloudflare.net2026-02-27 → 2026-05-14 · 3 obs

○ 2016-11-27 05:13:30
● 2026-02-27 13:13:58
● 2026-05-14 12:39:40

●MXroute3.mx.cloudflare.net2026-02-27 → 2026-05-14 · 3 obs

○ 2016-11-27 05:13:30
● 2026-02-27 13:13:58
● 2026-05-14 12:39:40

●A118.25.105.962026-03-14 → 2026-05-14 · 3 obs

○ 2026-02-27 13:13:58
● 2026-03-14 05:00:42
● 2026-05-14 12:39:40

○A133.130.125.2092016-11-27 → 2016-11-27 · 4 obs

○ 2016-04-15 15:03:50
● 2016-11-27 05:13:30
○ 2026-02-27 13:13:58
○ 2026-05-14 12:39:40

○A173.248.167.2322015-05-23 → 2016-04-15 · 4 obs

● 2015-05-23 18:08:02
● 2016-04-15 15:03:50
○ 2016-11-27 05:13:30
○ 2026-05-14 12:39:40

○A43.139.84.1342026-02-27 → 2026-02-27 · 4 obs

○ 2016-11-27 05:13:30
● 2026-02-27 13:13:58
○ 2026-03-14 05:00:42
○ 2026-05-14 12:39:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
51cdu.com	kehlani.ns.cloudflare.com, elijah.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.194.223

NS records: kehlani.ns.cloudflare.com, elijah.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51cdu.com (unsigned zone)

⏱️ Timing

Total: 389ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`118.25.105.96`
NS	2	`elijah.ns.cloudflare.com, kehlani.ns.cloudflare.com`
MX	3	`route3.mx.cloudflare.net (pri: 16), route1.mx.cloudflare.net (pri: 43)...`
TXT	1	`v=spf1 include:_spf.mx.cloudflare.net ~a`
SOA	1	`elijah.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (kehlani.ns.cloudflare.com, kehlani.ns.cloudflare.com, kehlani.ns.cloudflare.com...)

Analysis

Hierarchy

www.51cdu.com is a child of 51cdu.com.

IP Addresses

51cdu.com resolves to one IP number: 118.25.105.96.

Other host names, for example dns.ce.51cdu.com, share IP numbers with 51cdu.com.

Name Servers

51cdu.com's delegation uses two name servers: elijah.ns.cloudflare.com and kehlani.ns.cloudflare.com.

51cdu.com uses the same name server setup as other domains, such as dushupai.com, upace.app, dimikeys.net, justcase.gg and fankeys.net.

51cdu.com at least partially shares name servers with other domains, including krezicart.com, myapp-ip.com, thetileandstonespecialists.com, lwpdx.com and transport-demenagement-44.com.

These name servers are often used with vasilii.ns.cloudflare.com and otto.ns.cloudflare.com.

Host names with six IP numbers:

elijah.ns.cloudflare.com points to 2606:4700:58::a29f:2cfd, 2803:f800:50::6ca2:c3fd, 2a06:98c1:50::ac40:23fd, 108.162.195.253, 162.159.44.253 and 172.64.35.253.

kehlani.ns.cloudflare.com points to 2606:4700:50::a29f:26df, 2803:f800:50::6ca2:c2df, 2a06:98c1:50::ac40:22df, 108.162.194.223, 162.159.38.223 and 172.64.34.223.

Mail Servers

Three mail servers handle 51cdu.com: route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

51cdu.com shares at least some mail servers with other domains, for example gabe565.com, techtub.com, getmogul.com, ecrv.es and rookieparenting.com.

Host names with six IP numbers:

route1.mx.cloudflare.net points to: 2606:4700:f5::b, 2606:4700:f5::c, 2606:4700:f5::d, 162.159.205.11, 162.159.205.12 and 162.159.205.13

route2.mx.cloudflare.net points to: 2606:4700:f5::e, 2606:4700:f5::f, 2606:4700:f5::10, 162.159.205.17, 162.159.205.18 and 162.159.205.19

route3.mx.cloudflare.net points to: 2606:4700:f5::11, 2606:4700:f5::12, 2606:4700:f5::13, 162.159.205.23, 162.159.205.24 and 162.159.205.25

51cdu.com - robtex.com

51cdu.com

com

Subdomains

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`51cdu.com`

`com`