classes.io - robtex.com

classes.io

DNSSEC⚠️ Not signed
A2606:4700:3031::6815:41dd🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3031::ac43:c182🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.65.221Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.193.130🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NShank.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3b74🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRhank.ns.cloudflare.com
A2803:f800:50::6ca2:c174🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRhank.ns.cloudflare.com
A2a06:98c1:50::ac40:2174🇺🇸 Cloudflare2a06:98c1:50::/45
PTRhank.ns.cloudflare.com
A108.162.193.116🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRhank.ns.cloudflare.com
A172.64.33.116🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRhank.ns.cloudflare.com
A173.245.59.116🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRhank.ns.cloudflare.com
NSrita.ns.cloudflare.com
A2606:4700:50::adf5:3a8c🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrita.ns.cloudflare.com
A2803:f800:50::6ca2:c08c🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRrita.ns.cloudflare.com
A2a06:98c1:50::ac40:208c🇺🇸 Cloudflare2a06:98c1:50::/45
PTRrita.ns.cloudflare.com
A108.162.192.140🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrita.ns.cloudflare.com
A172.64.32.140🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrita.ns.cloudflare.com
A173.245.58.140🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrita.ns.cloudflare.com
MXaspmx.l.google.com ⭐
A2607:f8b0:4023:c06::1a🇺🇸 Google2607:f8b0::/32
PTRdz-in-f26.1e100.net
A142.250.101.27🇺🇸 Google142.250.101.0/24
PTRdz-in-f27.1e100.net
MXalt1.aspmx.l.google.com(5)
A2800:3f0:4003:c0f::1b🇨🇱 Google2800:3f0:4003::/48
A108.177.123.27🇺🇸 Google108.177.123.0/24
PTRlcscld-in-f27.1e100.net
MXalt2.aspmx.l.google.com(5)
A2607:f8b0:4023:3003::1a🇺🇸 Google2607:f8b0::/32
PTRyulnkjt-in-f26.1e100.net
A172.253.145.26🇺🇸 Google172.253.145.0/24
PTRyulnkjt-in-f26.1e100.net
MXaspmx2.googlemail.com(10)
A2800:3f0:4003:c0f::1b🇨🇱 Google2800:3f0:4003::/48
A108.177.123.27🇺🇸 Google108.177.123.0/24
PTRlcscld-in-f27.1e100.net
MXaspmx3.googlemail.com(10)
A2607:f8b0:4023:3003::1a🇺🇸 Google2607:f8b0::/32
PTRyulnkjt-in-f26.1e100.net
A172.253.145.27🇺🇸 Google172.253.145.0/24
PTRyulnkjt-in-f27.1e100.net
TXTgoogle-site-verification=bs6Lfl9-243OmryM8bkq8Sw_p1l1lTuS_ebuIsc0w68
TXTv=spf1 a mx ip4:67.208.38.23 ?all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.65.221, 172.67.193.130
IPv6 hints2606:4700:3031::6815:41dd, 2606:4700:3031::ac43:c182
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=44, name=cloudflare-ech.com
SOAhank.ns.cloudflare.comdns@cloudflare.com serial=2402257387

io

DNSSEC🔒 Signed (DS record present)
NSa0.nic.io ⭐
NSa2.nic.io
NSb0.nic.io
NSc0.nic.io
SOAa0.nic.iohostmaster@donuts.email serial=1778446563

Same first word

classes.com.au
classes.com
classes.ng
classes.life
classes.com.br
classes.ws
classes.org
classes.se
classes.dance
classes.us
classes.ch
classes.miami
classes.ru
classes.at
classes.io
classes.com.hk
classes.guru
classes.ie
classes.ca
classes.me
classes.eu
classes.co.il
classes.university
classes.training
classes.de

Similar names

esclass.cn
cassels.ca
cassels.us
cassels.nz
cassels.me
cassels.se
scaless.com
cassels.net
cassels.co.nz
esclass.com
salescs.com
esclass.net
casessl.com
cassels.com
seclass.com
cssales.com
cssales.co.uk
lessacs.fr
sealssc.com
cassels.org
cesslas.com
cassels.tv
lessacs.com

DNS History

11 records (11 active, 0 former)

201820192020202120222023202420252026NShank.ns.cloudflare.comrita.ns.cloudflare.comMXalt1.aspmx.l.google.comalt2.aspmx.l.google.comaspmx.l.google.comaspmx2.googlemail.comaspmx3.googlemail.comA104.21.65.221172.67.193.1302606:4700:3031::6815:41dd2606:4700:3031::ac43:c182
●NShank.ns.cloudflare.com2017-03-16 → 2026-05-10 · 2 obs
● 2017-03-16 18:05:16
● 2026-05-10 21:10:20
●NSrita.ns.cloudflare.com2017-03-16 → 2026-05-10 · 2 obs
● 2017-03-16 18:05:16
● 2026-05-10 21:10:20
●MXalt1.aspmx.l.google.com2026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●MXalt2.aspmx.l.google.com2026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●MXaspmx.l.google.com2026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●MXaspmx2.googlemail.com2026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●MXaspmx3.googlemail.com2026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●A104.21.65.2212026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●A172.67.193.1302026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●A2606:4700:3031::6815:41dd2026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20
●A2606:4700:3031::ac43:c1822026-05-03 → 2026-05-10 · 2 obs
● 2026-05-03 05:32:24
● 2026-05-10 21:10:20

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
iob0.nic.io, a0.nic.io, a2.nic.io, c0.nic.io-
classes.iohank.ns.cloudflare.com, rita.ns.cloudflare.com-

✅ Authoritative Response

Server:172.64.32.140

NS records: hank.ns.cloudflare.com, rita.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for classes.io (unsigned zone)

⏱️ Timing

Total: 527ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.65.221, 172.67.193.130
AAAA22606:4700:3031::6815:41dd, 2606:4700:3031::ac43:c182
NS2hank.ns.cloudflare.com, rita.ns.cloudflare.com
MX5aspmx.l.google.com (pri: 1), aspmx2.googlemail.com (pri: 10)...
TXT2google-site-verification=bs6Lfl9-243Omry, v=spf1 a mx ip4:67.208.38.23 ?all
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1hank.ns.cloudflare.com dns.cloudflare.co

Analysis

IP Addresses

classes.io maps to four IP numbers: 2606:4700:3031::6815:41dd, 2606:4700:3031::ac43:c182, 104.21.65.221 and 172.67.193.130.

Other host names, for instance sinoheavyvehicles.com, kingsedgrp.co.za, mariescort.com, www.mariescort.com and magnetsareusinc.com share IP numbers with classes.io.

Name Servers

Two name servers hank.ns.cloudflare.com and rita.ns.cloudflare.com are delegated to classes.io.

classes.io uses the same name server configuration as other domains, such as dinomartin.com, legoapi.com, tellyhd.com, nzbstack.com and apple9.org.

classes.io at least partially shares name servers with other domains such as cesal.org.tr, siribukuislamik.com, ctvlikesub.net, steinbach.us and withloop.com.

These name servers are commonly used with elly.ns.cloudflare.com, andy.ns.cloudflare.com, gina.ns.cloudflare.com and rose.ns.cloudflare.com.

Host names with six IP numbers: Host name hank.ns.cloudflare.com points to 2606:4700:58::adf5:3b74, 2803:f800:50::6ca2:c174, 2a06:98c1:50::ac40:2174, 108.162.193.116, 172.64.33.116 and 173.245.59.116; host name rita.ns.cloudflare.com points to 2606:4700:50::adf5:3a8c, 2803:f800:50::6ca2:c08c, 2a06:98c1:50::ac40:208c, 108.162.192.140, 172.64.32.140 and 173.245.58.140.

Mail Servers

classes.io is handled by five mail servers: aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx.l.google.com, alt1.aspmx.l.google.com and alt2.aspmx.l.google.com.

classes.io shares mail servers with other domains at least in part, for instance ns500794.ns500794.ns500821.ns500795.ns500821.ns500821.ns500821.ns500821.ns500795.ns500794.ns500794.ns500795.ns500790.ns500795.lustypartnersfinder.com, wivo.co.il, ns500671.ns500742.ns500754.ns500671.ns500731.ns500688.ns500671.ns500688.ns500671.ns500688.tenderladiesbz.com, ns500698.ns500758.ns500735.ns500736.ns500735.ns500736.ns500698.ns500576.ns500708.ns500698.ns500652.ns500652.ns500576.trackreceptor.com and ns500754.ns500742.ns500754.ns500742.ns500671.ns500731.ns500742.ns500688.ns500688.lustychickser.com.

These mail servers are often used together with alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, aspmx5.googlemail.com and aspmx4.googlemail.com.

Host names with two IPs:

The host names aspmx2.googlemail.com and alt1.aspmx.l.google.com point to 2800:3f0:4003:c0f::1b and 108.177.123.27.

The host name aspmx3.googlemail.com points to 2607:f8b0:4023:3003::1a and 172.253.145.27.

The host name aspmx.l.google.com points to 2607:f8b0:4023:c06::1a and 142.250.101.27.

The host name alt2.aspmx.l.google.com points to 2607:f8b0:4023:3003::1a and 172.253.145.26.

Host names that point to 2800:3f0:4003:c0f::1b: aspmx2.googlemail.com and alt1.aspmx.l.google.com.

Host names that point to 108.177.123.27: aspmx2.googlemail.com and alt1.aspmx.l.google.com.

Host names that point to 2607:f8b0:4023:3003::1a: aspmx3.googlemail.com and alt2.aspmx.l.google.com.