`21stcenturymath.com`

DNSSEC	⚠️ Not signed
NS	`ns-cloud-a1.googledomains.com` ⭐
		A	2001:4860:4802:32::6a^{🇺🇸 Google2001:4860::/32}
			PTR	`ns-cloud-a1.googledomains.com`
		A	216.239.32.106^{🇺🇸 Google216.239.32.0/24}
			PTR	`ns-cloud-a1.googledomains.com`
NS	`ns-cloud-a2.googledomains.com`
		A	2001:4860:4802:34::6a^{🇺🇸 Google2001:4860::/32}
			PTR	`ns-cloud-a2.googledomains.com`
		A	216.239.34.106^{🇺🇸 Google216.239.34.0/24}
			PTR	`ns-cloud-a2.googledomains.com`
NS	`ns-cloud-a3.googledomains.com`
		A	2001:4860:4802:36::6a^{🇺🇸 Google2001:4860::/32}
			PTR	`ns-cloud-a3.googledomains.com`
		A	216.239.36.106^{🇺🇸 Google216.239.36.0/24}
			PTR	`ns-cloud-a3.googledomains.com`
NS	`ns-cloud-a4.googledomains.com`
		A	2001:4860:4802:38::6a^{🇺🇸 Google2001:4860::/32}
			PTR	`ns-cloud-a4.googledomains.com`
		A	216.239.38.106^{🇺🇸 Google216.239.38.0/24}
			PTR	`ns-cloud-a4.googledomains.com`
SOA	`ns-cloud-a1.googledomains.com`cloud-dns-hostmaster@google.com serial=33

`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=1778380701

Same first word

21stcenturymath.com

DNS History

18 records (4 active, 14 former)

●NSns-cloud-a1.googledomains.com2026-05-10 → 2026-05-10 · 2 obs

○ 2017-03-26 11:56:18
● 2026-05-10 02:49:36

●NSns-cloud-a2.googledomains.com2026-05-10 → 2026-05-10 · 2 obs

○ 2017-03-26 11:56:18
● 2026-05-10 02:49:36

●NSns-cloud-a3.googledomains.com2026-05-10 → 2026-05-10 · 2 obs

○ 2017-03-26 11:56:18
● 2026-05-10 02:49:36

●NSns-cloud-a4.googledomains.com2026-05-10 → 2026-05-10 · 2 obs

○ 2017-03-26 11:56:18
● 2026-05-10 02:49:36

○NSns-us.1and1-dns.com2015-08-15 → 2017-03-26 · 3 obs

● 2015-08-15 06:32:14
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○NSns-us.1and1-dns.de2015-08-15 → 2017-03-26 · 3 obs

● 2015-08-15 06:32:14
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○NSns-us.1and1-dns.org2015-08-15 → 2017-03-26 · 3 obs

● 2015-08-15 06:32:14
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○NSns-us.1and1-dns.us2015-08-15 → 2017-03-26 · 3 obs

● 2015-08-15 06:32:14
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○MXmx00.1and1.com2015-08-15 → 2017-03-26 · 3 obs

● 2015-08-15 06:32:14
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○MXmx01.1and1.com2015-08-15 → 2017-03-26 · 3 obs

● 2015-08-15 06:32:14
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○A104.254.245.1482015-12-08 → 2015-12-08 · 4 obs

○ 2015-08-15 06:32:14
● 2015-12-08 21:55:48
○ 2016-03-11 23:46:54
○ 2026-05-10 02:49:36

○A13.88.8.2522016-07-05 → 2016-07-05 · 4 obs

○ 2016-03-11 23:46:54
● 2016-07-05 00:43:38
○ 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○A2607:f1c0:1000:8047:7edb:87b5:787b:c01e2016-03-11 → 2016-03-11 · 4 obs

○ 2015-12-08 21:55:48
● 2016-03-11 23:46:54
○ 2016-07-05 00:43:38
○ 2026-05-10 02:49:36

○A2607:f1c0:1000:8047:994f:e0a9:c2ce:88022015-12-08 → 2015-12-08 · 4 obs

○ 2015-08-15 06:32:14
● 2015-12-08 21:55:48
○ 2016-03-11 23:46:54
○ 2026-05-10 02:49:36

○A2607:f1c0:1000:c0b6:1660:6ab8:6127:b0022015-08-15 → 2015-08-15 · 3 obs

● 2015-08-15 06:32:14
○ 2015-12-08 21:55:48
○ 2026-05-10 02:49:36

○A40.112.214.1452017-03-26 → 2017-03-26 · 3 obs

○ 2016-07-05 00:43:38
● 2017-03-26 11:56:18
○ 2026-05-10 02:49:36

○A74.208.122.2342016-03-11 → 2016-03-11 · 4 obs

○ 2015-12-08 21:55:48
● 2016-03-11 23:46:54
○ 2016-07-05 00:43:38
○ 2026-05-10 02:49:36

○A74.208.136.2302015-08-15 → 2015-08-15 · 3 obs

● 2015-08-15 06:32:14
○ 2015-12-08 21:55:48
○ 2026-05-10 02:49:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, d.gtld-servers.net, m.gtld-servers.net, a.gtld-servers.net...	-
21stcenturymath.com	ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.com	8 records

✅ Authoritative Response

Server:216.239.32.106

NS records: ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com, ns-cloud-a4.googledomains.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21stcenturymath.com (unsigned zone)

⏱️ Timing

Total: 446ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	4	`ns-cloud-a1.googledomains.com, ns-cloud-a3.googledomains.com...`
SOA	1	`ns-cloud-a1.googledomains.com cloud-dns-`

📌 Glue Records Collected

Total: 8

Out-of-bailiwick: 8 (ns-cloud-a1.googledomains.com, ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com...)

Analysis

Name Servers

21stcenturymath.com is delegated to four name servers: ns-cloud-a1.googledomains.com, ns-cloud-a2.googledomains.com, ns-cloud-a3.googledomains.com and ns-cloud-a4.googledomains.com.

21stcenturymath.com shares some name servers with other domains, for example lincolncofair.com, haldergroup.com, kritha.com, samaddington.com and solveforwhy.io.

Host names with two IP numbers

Two IPs per host:

ns-cloud-a1.googledomains.com points to 2001:4860:4802:32::6a and 216.239.32.106

ns-cloud-a2.googledomains.com points to 2001:4860:4802:34::6a and 216.239.34.106

ns-cloud-a3.googledomains.com points to 2001:4860:4802:36::6a and 216.239.36.106

ns-cloud-a4.googledomains.com points to 2001:4860:4802:38::6a and 216.239.38.106

21stcenturymath.com - robtex.com