21.co - robtex.com

21.co

DNSSEC⚠️ Not signed
NSns1.dreamhost.com ⭐
A162.159.26.14Cloudflare162.159.26.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRns1.dreamhost.com
NSns2.dreamhost.com
A162.159.26.81Cloudflare162.159.26.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRns2.dreamhost.com
NSns3.dreamhost.com
A162.159.27.84Cloudflare162.159.27.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRns3.dreamhost.com
MXsmtp.google.com ⭐
A2607:f8b0:4023:1004::1a🇺🇸 Google2607:f8b0::/32
PTRrq-in-f26.1e100.net
A2607:f8b0:4023:1004::1b🇺🇸 Google2607:f8b0::/32
PTRrq-in-f27.1e100.net
A2607:f8b0:4023:1011::1a🇺🇸 Google2607:f8b0::/32
PTRncdfwo-in-f26.1e100.net
A2607:f8b0:4023:1011::1b🇺🇸 Google2607:f8b0::/32
PTRncdfwo-in-f27.1e100.net
A142.250.26.26🇺🇸 Google142.250.26.0/24
PTRncdfwo-in-f26.1e100.net
A142.250.26.27🇺🇸 Google142.250.26.0/24
PTRncdfwo-in-f27.1e100.net
A142.250.114.27🇺🇸 Google142.250.114.0/24
PTRrr-in-f27.1e100.net
A142.250.115.26🇺🇸 Google142.250.115.0/24
PTRrq-in-f26.1e100.net
A142.250.115.27🇺🇸 Google142.250.115.0/24
PTRrq-in-f27.1e100.net
SOAns1.dreamhost.comhostmaster@dreamhost.com 2025-12-15 #0

co

DNSSEC🔒 Signed (DS record present)
NSns0.centralnic.net ⭐
NSa.registrydns.co 🔒
NSb.registrydns.co 🔒
NSc.registrydns.co 🔒
NSd.registrydns.co 🔒
SOAns0.centralnic.nethostmaster@centralnic.net serial=1759588016
rank #176552 globally
rank #756 in the tld
WOT: UNKNOWN (93/100)
📈 Tranco rank: #250,976

Subdomains

www.21.co

Same first word

21.ax
21.gold
21.nu
21.business
21.casino
21.red
21.pl
21.ee
21.com.vn
21.partners
21.to
21.ie
21.photos
21.sb
21.cc
21.city
21.gs
21.fr
21.live
21.by
21.com.es
21.eu
21.run
21.pw
21.se
21.org.cn
21.chat
21.net
21.game
21.la
21.ag
21.diamonds
21.cn
21.de
21.training
21.ca
21.org
21.com.tw
21.co.uk
21.vc
21.am
21.im
21.rs
21.amsterdam
21.com
21.bet
21.center
21.kz
21.fyi
21.cm
21.web.app
21.network
21.si
21.ph
21.is
21.be
21.com.ua
21.pe
21.edu.ar
21.gg
21.technology
21.capital
21.dk
21.email
21.ai
21.wf
21.sk
21.zone
21.immo
21.hk
21.cz
21.style
21.school
21.ink
21.show
21.nl
21.agency
21.co
21.biz
21.lv
21.uk
21.ru
21.co.za
21.finance

Similar names

12.de
12.in-addr.arpa
12.ag
12.kz
12.ie
12.plus
12.com.ua
12.cz
12.eu
12.uk
12.life
12.network
12.dk
12.com.cn
12.org.ru
12.cx
12.org
12.nu
12.gl
12.vip
12.fyi
12.ai
12.tt
12.hk
12.gs
12.amsterdam
12.fr
12.vc
12.am
12.agency
12.digital
12.ac.cn
12.lt
12.si
12.tf
12.pw
12.be
12.fi
12.cc
12.is
12.chat
12.netlify.app
12.solutions
12.dyndns.tv
12.cm
12.pl
12.world
12.by

DNS History

25 records (4 active, 21 former)

2017201820192020202120222023202420252026NSns1.dreamhost.comns2.dreamhost.comns3.dreamhost.comdina.ns.cloudflare.comkip.ns.cloudflare.comMXsmtp.google.comalt1.aspmx.l.google.comalt2.aspmx.l.google.comaspmx.l.google.comaspmx2.googlemail.comaspmx3.googlemail.comA104.20.112.31104.20.113.31104.20.82.116104.20.83.116104.22.18.190104.22.19.190172.67.40.1422400:cb00:2048:1::6814:52742400:cb00:2048:1::6814:53742400:cb00:2048:1::6814:701f2400:cb00:2048:1::6814:711f2606:4700:10::6816:12be2606:4700:10::6816:13be2606:4700:10::ac43:288e
○NSdina.ns.cloudflare.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
○NSkip.ns.cloudflare.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
●NSns1.dreamhost.com2026-02-16 → 2026-03-11 · 3 obs
○ 2021-10-15 20:31:04
● 2026-02-16 08:42:00
● 2026-03-11 06:56:20
●NSns2.dreamhost.com2026-02-16 → 2026-03-11 · 3 obs
○ 2021-10-15 20:31:04
● 2026-02-16 08:42:00
● 2026-03-11 06:56:20
●NSns3.dreamhost.com2026-02-16 → 2026-03-11 · 3 obs
○ 2021-10-15 20:31:04
● 2026-02-16 08:42:00
● 2026-03-11 06:56:20
○MXalt1.aspmx.l.google.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
○MXalt2.aspmx.l.google.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
○MXaspmx.l.google.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
○MXaspmx2.googlemail.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
○MXaspmx3.googlemail.com2016-12-05 → 2021-10-15 · 4 obs
● 2016-12-05 00:31:48
● 2021-10-15 20:31:04
○ 2026-02-16 08:42:00
○ 2026-03-11 06:56:20
●MXsmtp.google.com2026-02-16 → 2026-03-11 · 3 obs
○ 2021-10-15 20:31:04
● 2026-02-16 08:42:00
● 2026-03-11 06:56:20
○A104.20.112.312017-02-15 → 2017-03-12 · 5 obs
○ 2016-12-05 00:31:48
● 2017-02-15 13:33:28
● 2017-03-12 20:00:36
○ 2021-07-20 22:46:58
○ 2026-03-11 06:56:20
○A104.20.113.312017-02-15 → 2017-03-12 · 5 obs
○ 2016-12-05 00:31:48
● 2017-02-15 13:33:28
● 2017-03-12 20:00:36
○ 2021-07-20 22:46:58
○ 2026-03-11 06:56:20
○A104.20.82.1162016-12-05 → 2016-12-05 · 3 obs
● 2016-12-05 00:31:48
○ 2017-02-15 13:33:28
○ 2026-03-11 06:56:20
○A104.20.83.1162016-12-05 → 2016-12-05 · 3 obs
● 2016-12-05 00:31:48
○ 2017-02-15 13:33:28
○ 2026-03-11 06:56:20
○A104.22.18.1902021-07-20 → 2026-02-16 · 5 obs
○ 2017-03-12 20:00:36
● 2021-07-20 22:46:58
● 2026-02-16 08:42:00
○ 2026-02-18 08:21:14
○ 2026-03-11 06:56:20
○A104.22.19.1902021-07-20 → 2026-02-16 · 5 obs
○ 2017-03-12 20:00:36
● 2021-07-20 22:46:58
● 2026-02-16 08:42:00
○ 2026-02-18 08:21:14
○ 2026-03-11 06:56:20
○A172.67.40.1422021-07-20 → 2026-02-16 · 5 obs
○ 2017-03-12 20:00:36
● 2021-07-20 22:46:58
● 2026-02-16 08:42:00
○ 2026-02-18 08:21:14
○ 2026-03-11 06:56:20
○A2400:cb00:2048:1::6814:52742016-12-05 → 2016-12-05 · 3 obs
● 2016-12-05 00:31:48
○ 2017-02-15 13:33:28
○ 2026-03-11 06:56:20
○A2400:cb00:2048:1::6814:53742016-12-05 → 2016-12-05 · 3 obs
● 2016-12-05 00:31:48
○ 2017-02-15 13:33:28
○ 2026-03-11 06:56:20
○A2400:cb00:2048:1::6814:701f2017-02-15 → 2017-03-12 · 5 obs
○ 2016-12-05 00:31:48
● 2017-02-15 13:33:28
● 2017-03-12 20:00:36
○ 2021-07-20 22:46:58
○ 2026-03-11 06:56:20
○A2400:cb00:2048:1::6814:711f2017-02-15 → 2017-03-12 · 5 obs
○ 2016-12-05 00:31:48
● 2017-02-15 13:33:28
● 2017-03-12 20:00:36
○ 2021-07-20 22:46:58
○ 2026-03-11 06:56:20
○A2606:4700:10::6816:12be2021-07-20 → 2026-02-16 · 5 obs
○ 2017-03-12 20:00:36
● 2021-07-20 22:46:58
● 2026-02-16 08:42:00
○ 2026-02-18 08:21:14
○ 2026-03-11 06:56:20
○A2606:4700:10::6816:13be2021-07-20 → 2026-02-16 · 5 obs
○ 2017-03-12 20:00:36
● 2021-07-20 22:46:58
● 2026-02-16 08:42:00
○ 2026-02-18 08:21:14
○ 2026-03-11 06:56:20
○A2606:4700:10::ac43:288e2021-07-20 → 2026-02-16 · 5 obs
○ 2017-03-12 20:00:36
● 2021-07-20 22:46:58
● 2026-02-16 08:42:00
○ 2026-02-18 08:21:14
○ 2026-03-11 06:56:20

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coa.registrydns.co, b.registrydns.co, c.registrydns.co, d.registrydns.co8 records
21.cons2.dreamhost.com, ns1.dreamhost.com, ns3.dreamhost.com-

✅ Authoritative Response

Server: 162.159.26.81

NS records: ns2.dreamhost.com, ns1.dreamhost.com, ns3.dreamhost.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21.co (unsigned zone)

⏱️ Timing

Total: 527ms | Queries: -

📄 Records

TypeCountSample Data
NS3ns3.dreamhost.com, ns2.dreamhost.com...
MX1smtp.google.com (pri: 1)
SOA1ns1.dreamhost.com hostmaster.dreamhost.c

📌 Glue Records Collected

Total: 8

In-bailiwick: 8 (a.registrydns.co, a.registrydns.co, b.registrydns.co...)

Analysis

Hierarchy

The parent of www.21.co is 21.co.

Name Servers

21.co is delegated to three name servers: ns1.dreamhost.com, ns2.dreamhost.com and ns3.dreamhost.com.

21.co at least partially shares name servers with other domains, for example romantickit.com, johnnylab.com, nonprofitlocator.org, bbchapnick.com and taiwan-adventures.com.

Host names with a single IP address:

ns1.dreamhost.com resolves to 162.159.26.14.

ns2.dreamhost.com resolves to 162.159.26.81.

ns3.dreamhost.com resolves to 162.159.27.84.

Mail Servers

The smtp.google.com mail server handles 21.co.

21.co shares the same mail server setup as other domains, including apdojo.com, moneytransfer.cz, ecnet.in, mgshowroom.com and cougar-electric.com.

21.co shares at least partially some mail servers with other domains, for instance webtotal.dk, onedaylucky.com, akakom-stephen.ac.id, datelog.org and ctibh.com.br.

these mail servers are commonly used with aspmx.l.google.com.

The host name smtp.google.com maps to nine IP numbers: 2607:f8b0:4023:1004::1a, 2607:f8b0:4023:1004::1b, 2607:f8b0:4023:1011::1a, 2607:f8b0:4023:1011::1b, 142.250.26.26, 142.250.26.27, 142.250.114.27, 142.250.115.26 and 142.250.115.27.