`classmates.co`

DNSSEC	⚠️ Not signed
NS	`pdns3.ultradns.org` ⚠️ Not in zone NS records
		A	2610:a1:1015::1^{🇺🇸 MAINT-ID-120082610:a1:1015::/48 Neustar}
			PTR	`pdns3.ultradns.org`
		A	199.7.68.1^{🇺🇸 MAINT-ID-12008199.7.68.0/24 Neustar}
			PTR	`pdns3.ultradns.org`
NS	`pdns4.ultradns.org` ⚠️ Not in zone NS records
		A	2001:502:4612::1^{🇺🇸 MAINT-ID-120082001:502:4612::/48 Neustar}
			PTR	`pdns4.ultradns.org`
		A	199.7.69.1^{🇺🇸 MAINT-ID-12008199.7.69.0/24 Neustar}
			PTR	`pdns4.ultradns.org`

`co`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns0.centralnic.net` ⭐
	NS	`a.registrydns.co`
	NS	`b.registrydns.co`
	NS	`c.registrydns.co`
	NS	`d.registrydns.co`
	SOA	`ns0.centralnic.net`hostmaster@centralnic.net serial=1759617824

Same first word

Similar names

matesclass.com

samscastle.org

classmaets.net

classamtes.net

classmtaes.com

matclasses.com

classteams.com

classamtes.org

calssmates.com

classsmate.com

classamtes.com

DNS History

2 records (2 active, 0 former)

●NSpdns3.ultradns.org2026-03-15 → 2026-03-25 · 2 obs

● 2026-03-15 06:38:18
● 2026-03-25 11:53:18

●NSpdns4.ultradns.org2026-03-15 → 2026-03-25 · 2 obs

● 2026-03-15 06:38:18
● 2026-03-25 11:53:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
co	a.registrydns.co, b.registrydns.co, c.registrydns.co, d.registrydns.co	-
classmates.co	pdns3.ultradns.org, pdns4.ultradns.org	-

✅ Authoritative Response

Server:199.7.68.1

NS records: pdns3.ultradns.org, pdns4.ultradns.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for classmates.co (unsigned zone)

⏱️ Timing

Total: 102ms | Queries: -

📄 Records

Type	Count	Sample Data

Analysis

Name Servers

classmates.co has two name servers: pdns3.ultradns.org and pdns4.ultradns.org.

classmates.co uses the same name server setup as other domains, for example xlassmate.com and hs-classmates.com.

classmates.co shares some name servers with other domains, for example gme-mims.com, logistiekzorg.nl, columbia.cz, birkhauserscience.com and onestopplus.co.uk.

these name servers are often used with pdns1.ultradns.net, pdns5.ultradns.info, pdns2.ultradns.net, pdns6.ultradns.co.uk, udns1.ultradns.net, udns2.ultradns.net, a1-76.akam.net, a28-67.akam.net, a3-66.akam.net and a4-64.akam.net.

Host names with two IP numbers:

pdns3.ultradns.org points to: 2610:a1:1015::1 and 199.7.68.1; pdns4.ultradns.org points to: 2001:502:4612::1 and 199.7.69.1.

classmates.co - robtex.com

classmates.co

co