classduo.com - dns.ninja

`classduo.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:58c1^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::ac43:ba8c^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.88.193^{Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.186.140^{🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`liz.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3abd^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`liz.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0bd^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`liz.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20bd^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`liz.ns.cloudflare.com`
		A	108.162.192.189^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`liz.ns.cloudflare.com`
		A	172.64.32.189^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`liz.ns.cloudflare.com`
		A	173.245.58.189^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`liz.ns.cloudflare.com`
NS	`pablo.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bdc^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`pablo.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1dc^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`pablo.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21dc^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`pablo.ns.cloudflare.com`
		A	108.162.193.220^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`pablo.ns.cloudflare.com`
		A	172.64.33.220^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`pablo.ns.cloudflare.com`
		A	173.245.59.220^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`pablo.ns.cloudflare.com`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c1f::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`pd-in-f27.1e100.net`
		A	173.194.45.26^{🇺🇸 Google173.194.0.0/16}
			PTR	`yuiadum-in-f26.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c0f::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.26^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f26.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2a00:1450:400b:c02::1b^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f27.1e100.net`
		A	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
MX	`alt3.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:4009:c0f::1a^{🇬🇧 Google2a00:1450:4009::/48}
			PTR	`yulhrs-in-f26.1e100.net`
		A	192.178.223.27^{🇺🇸 Google192.178.223.0/24}
			PTR	`yulhrs-in-f27.1e100.net`
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:400c:c23::1b^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`yubrupd-in-f27.1e100.net`
		A	172.253.157.27^{🇺🇸 Google172.253.0.0/16}
			PTR	`yubrupd-in-f27.1e100.net`
TXT	`google-site-verification=e5ZzJzLoH7bC1O7kpmf4yVNX8pmGczjs5q53lttV77s`
TXT	`google-site-verification=yzfp_UEokpDkfeMWUDDZpffjsGKdhrI5PCFBLNKzTuU`
TXT	`v=spf1 include:_spf.google.com ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.88.193, 172.67.186.140
		IPv6 hints	2606:4700:3030::6815:58c1, 2606:4700:3034::ac43:ba8c
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=139, name=cloudflare-ech.com
SOA	`liz.ns.cloudflare.com`dns@cloudflare.com serial=2407058558

`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=1785202042

Same first word

classduo.com

Similar names

classudo.com

usdscalo.cc

sascloud.com.au

douclass.com

sascloud.com

DNS History

20 records (11 active, 9 former)

●NSliz.ns.cloudflare.com2026-02-19 → 2026-07-28 · 3 obs

○ 2018-12-28 15:37:26
● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

○NSns57.domaincontrol.com2018-12-28 → 2018-12-28 · 3 obs

● 2018-12-28 15:37:26
○ 2026-02-19 08:44:40
○ 2026-07-28 01:43:54

○NSns58.domaincontrol.com2018-12-28 → 2018-12-28 · 3 obs

● 2018-12-28 15:37:26
○ 2026-02-19 08:44:40
○ 2026-07-28 01:43:54

●NSpablo.ns.cloudflare.com2026-02-19 → 2026-07-28 · 3 obs

○ 2018-12-28 15:37:26
● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

●MXalt1.aspmx.l.google.com2026-02-19 → 2026-07-28 · 2 obs

● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

●MXalt2.aspmx.l.google.com2026-02-19 → 2026-07-28 · 2 obs

● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

●MXalt3.aspmx.l.google.com2026-02-19 → 2026-07-28 · 2 obs

● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

●MXalt4.aspmx.l.google.com2026-02-19 → 2026-07-28 · 2 obs

● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

●MXaspmx.l.google.com2026-02-19 → 2026-07-28 · 2 obs

● 2026-02-19 08:44:40
● 2026-07-28 01:43:54

●A104.21.88.1932026-02-19 → 2026-07-28 · 8 obs

○ 2018-12-28 15:37:26
● 2026-02-19 08:44:40
● 2026-04-13 09:54:54
○ 2026-05-14 13:12:50
● 2026-06-14 17:47:58
○ 2026-06-14 22:53:50
● 2026-07-28 01:43:52
● 2026-07-28 01:43:54

●A172.67.186.1402026-02-19 → 2026-07-28 · 8 obs

○ 2018-12-28 15:37:26
● 2026-02-19 08:44:40
● 2026-04-13 09:54:54
○ 2026-05-14 13:12:50
● 2026-06-14 17:47:58
○ 2026-06-14 22:53:50
● 2026-07-28 01:43:52
● 2026-07-28 01:43:54

○A188.114.96.02026-05-14 → 2026-06-14 · 6 obs

○ 2026-04-13 09:54:54
● 2026-05-14 13:12:50
○ 2026-06-14 17:47:58
● 2026-06-14 22:53:50
○ 2026-07-28 01:43:52
○ 2026-07-28 01:43:54

○A188.114.97.02026-05-14 → 2026-06-14 · 6 obs

○ 2026-04-13 09:54:54
● 2026-05-14 13:12:50
○ 2026-06-14 17:47:58
● 2026-06-14 22:53:50
○ 2026-07-28 01:43:52
○ 2026-07-28 01:43:54

●A2606:4700:3030::6815:58c12026-07-28 → 2026-07-28 · 3 obs

○ 2026-06-14 22:53:50
● 2026-07-28 01:43:52
● 2026-07-28 01:43:54

○A2606:4700:3034::6815:58c12026-02-19 → 2026-06-14 · 7 obs

○ 2018-12-28 15:37:26
● 2026-02-19 08:44:40
● 2026-04-13 09:54:54
○ 2026-05-14 13:12:50
● 2026-06-14 17:47:58
○ 2026-06-14 22:53:50
○ 2026-07-28 01:43:54

●A2606:4700:3034::ac43:ba8c2026-07-28 → 2026-07-28 · 3 obs

○ 2026-06-14 22:53:50
● 2026-07-28 01:43:52
● 2026-07-28 01:43:54

○A2606:4700:3037::ac43:ba8c2026-02-19 → 2026-06-14 · 7 obs

○ 2018-12-28 15:37:26
● 2026-02-19 08:44:40
● 2026-04-13 09:54:54
○ 2026-05-14 13:12:50
● 2026-06-14 17:47:58
○ 2026-06-14 22:53:50
○ 2026-07-28 01:43:54

○A2a06:98c1:3120::2026-05-14 → 2026-06-14 · 6 obs

○ 2026-04-13 09:54:54
● 2026-05-14 13:12:50
○ 2026-06-14 17:47:58
● 2026-06-14 22:53:50
○ 2026-07-28 01:43:52
○ 2026-07-28 01:43:54

○A2a06:98c1:3121::2026-05-14 → 2026-06-14 · 6 obs

○ 2026-04-13 09:54:54
● 2026-05-14 13:12:50
○ 2026-06-14 17:47:58
● 2026-06-14 22:53:50
○ 2026-07-28 01:43:52
○ 2026-07-28 01:43:54

○A37.120.143.812018-12-28 → 2018-12-28 · 3 obs

● 2018-12-28 15:37:26
○ 2026-02-19 08:44:40
○ 2026-07-28 01:43:54

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
classduo.com	pablo.ns.cloudflare.com, liz.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.220

NS records: pablo.ns.cloudflare.com, liz.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for classduo.com (unsigned zone)

⏱️ Timing

Total: 210ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.186.140, 104.21.88.193`
AAAA	2	`2606:4700:3034::ac43:ba8c, 2606:4700:3030::6815:58c1`
NS	2	`liz.ns.cloudflare.com, pablo.ns.cloudflare.com`
MX	5	`aspmx.l.google.com (pri: 1), alt3.aspmx.l.google.com (pri: 10)...`
TXT	3	`google-site-verification=e5ZzJzLoH7bC1O7, google-site-verification=yzfp_UEokpDkfeM...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`liz.ns.cloudflare.com dns.cloudflare.com`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

classduo.com directs to four IP numbers, which are 104.21.88.193, 172.67.186.140, 2606:4700:3030::6815:58c1 and 2606:4700:3034::ac43:ba8c.

mx7.tnemes.com, solversindia.net, www.0xf.kr plus two other host names have IP numbers in common with classduo.com.

Name Servers

classduo.com has two authoritative name servers — liz.ns.cloudflare.com and pablo.ns.cloudflare.com.

The name server configuration of classduo.com is shared with other domains, for instance hsys.eu, theinfra.com, seattlesinginglady.com and two others.

The name servers of classduo.com overlap at least partially with those of other domains — among them orionmedia.com.br, 224122.com, 032oo.com and two more.

The name servers gina.ns.cloudflare.com, jason.ns.cloudflare.com and mark.ns.cloudflare.com are commonly seen alongside these name servers.

Hosts with 6 IP addresses each:

liz.ns.cloudflare.com points to 108.162.192.189, 172.64.32.189, 173.245.58.189 and 3 other IP addresses.

pablo.ns.cloudflare.com points to 108.162.193.220, 172.64.33.220, 173.245.59.220 and 3 other IP addresses.

Mail Servers

Five mail servers handle classduo.com: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and two others.

At least some of the mail servers used by classduo.com are shared with other domains: ns500724.ns500737.ns500737.ns500599.ns500599.ns500724.ns500724.ns500737.ns500737.ns500697.ns500583.ns500669.yummyflingsfinder.com, ns500671.ns500671.ns500731.ns500754.ns500704.ns500688.ns500705.ns500291.ns500671.ns500666.tenderladiesbz.com, fasttraxllc.com and two others among them.

These mail servers are often deployed together with alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, aspmx2.googlemail.com and 3 other mail servers.

Host names pointing to two IP addresses:

aspmx.l.google.com resolves to 173.194.45.26 and 2607:f8b0:4004:c1f::1b.

alt1.aspmx.l.google.com resolves to 108.177.123.26 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com resolves to 172.253.116.26 and 2a00:1450:400b:c02::1b.

alt3.aspmx.l.google.com resolves to 192.178.223.27 and 2a00:1450:4009:c0f::1a.

alt4.aspmx.l.google.com resolves to 172.253.157.27 and 2a00:1450:400c:c23::1b.