century21.us - robtex.com

century21.us

DNSSEC⚠️ Not signed
A3.21.30.236🇺🇸 Amazon3.20.0.0/14 EC2 CMH prefix
PTRec2-3-21-30-236.us-east-2.compute.amazonaws.com
A3.138.52.249🇺🇸 Amazon3.136.0.0/13 EC2 CMH prefix
NSns-231.awsdns-28.com ⭐
A2600:9000:5300:e700::1🇺🇸 Amazon2600:9000:5300::/48 - CloudFront
PTRns-231.awsdns-28.com
A205.251.192.231🇺🇸 Amazon205.251.192.0/24 prefix
PTRns-231.awsdns-28.com
NSns-1532.awsdns-63.org
A2600:9000:5305:fc00::1🇺🇸 Amazon2600:9000:5305::/48 - CloudFront
PTRns-1532.awsdns-63.org
A205.251.197.252🇺🇸 Amazon205.251.197.0/24 prefix
PTRns-1532.awsdns-63.org
NSns-1710.awsdns-21.co.uk
A2600:9000:5306:ae00::1🇺🇸 Amazon2600:9000:5306::/48 - CloudFront
PTRns-1710.awsdns-21.co.uk
A205.251.198.174🇺🇸 Amazon205.251.198.0/24 prefix
PTRns-1710.awsdns-21.co.uk
NSns-534.awsdns-02.net
A2600:9000:5302:1600::1🇺🇸 Amazon2600:9000:5302::/48 - CloudFront
PTRns-534.awsdns-02.net
A205.251.194.22🇺🇸 Amazon205.251.194.0/24 prefix
PTRns-534.awsdns-02.net
SOAns-231.awsdns-28.comawsdns-hostmaster@amazon.com serial=1

us

DNSSEC🔒 Signed (DS record present)
NSa.cctld.us ⭐
NSb.cctld.us
NSf.cctld.us
NSk.cctld.us
NSm.cctld.us
NSn.cctld.us
NSw.cctld.us
NSx.cctld.us
NSy.cctld.us
SOAa.cctld.usadmin@tldns.godaddy serial=1778285144

Same first word

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century21.de
century21.com.ar
century21.estate
century21.com.gr
century21.mobi
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century21.xyz

Similar names

21century.com
21century.ru
21century.tv
21century.co.in
21century.education
21century.edu.az
21century.co.th
centruy21.com
21century.de
21century.net.au
21century.com.tw
21century.co.at

DNS History

11 records (6 active, 5 former)

20162017201820192020202120222023202420252026NSns-1532.awsdns-63.orgns-1710.awsdns-21.co.ukns-231.awsdns-28.comns-534.awsdns-02.netns1.savvis.netns2.savvis.netns3.savvis.netA3.138.52.2493.21.30.2363.23.162.8464.37.197.59
●NSns-1532.awsdns-63.org2026-05-05 → 2026-05-09 · 3 obs
○ 2016-08-27 02:46:54
● 2026-05-05 12:20:56
● 2026-05-09 00:35:50
●NSns-1710.awsdns-21.co.uk2026-05-05 → 2026-05-09 · 3 obs
○ 2016-08-27 02:46:54
● 2026-05-05 12:20:56
● 2026-05-09 00:35:50
●NSns-231.awsdns-28.com2026-05-05 → 2026-05-09 · 3 obs
○ 2016-08-27 02:46:54
● 2026-05-05 12:20:56
● 2026-05-09 00:35:50
●NSns-534.awsdns-02.net2026-05-05 → 2026-05-09 · 3 obs
○ 2016-08-27 02:46:54
● 2026-05-05 12:20:56
● 2026-05-09 00:35:50
○NSns1.savvis.net2015-08-08 → 2016-08-27 · 4 obs
● 2015-08-08 14:50:56
● 2016-08-27 02:46:54
○ 2026-05-05 12:20:56
○ 2026-05-09 00:35:50
○NSns2.savvis.net2015-08-08 → 2016-08-27 · 4 obs
● 2015-08-08 14:50:56
● 2016-08-27 02:46:54
○ 2026-05-05 12:20:56
○ 2026-05-09 00:35:50
○NSns3.savvis.net2015-08-08 → 2016-08-27 · 4 obs
● 2015-08-08 14:50:56
● 2016-08-27 02:46:54
○ 2026-05-05 12:20:56
○ 2026-05-09 00:35:50
●A3.138.52.2492026-05-05 → 2026-05-09 · 3 obs
○ 2016-08-27 02:46:54
● 2026-05-05 12:20:56
● 2026-05-09 00:35:50
●A3.21.30.2362026-05-08 → 2026-05-09 · 3 obs
○ 2026-05-05 12:20:56
● 2026-05-08 06:47:54
● 2026-05-09 00:35:50
○A3.23.162.842026-05-05 → 2026-05-05 · 4 obs
○ 2016-08-27 02:46:54
● 2026-05-05 12:20:56
○ 2026-05-08 06:47:54
○ 2026-05-09 00:35:50
○A64.37.197.592015-08-08 → 2016-08-27 · 4 obs
● 2015-08-08 14:50:56
● 2016-08-27 02:46:54
○ 2026-05-05 12:20:56
○ 2026-05-09 00:35:50

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
usn.cctld.us, w.cctld.us, x.cctld.us, k.cctld.us...-
century21.usns-1710.awsdns-21.co.uk, ns-1532.awsdns-63.org, ns-231.awsdns-28.com, ns-534.awsdns-02.net-

✅ Authoritative Response

Server:205.251.194.22

NS records: ns-1710.awsdns-21.co.uk, ns-1532.awsdns-63.org, ns-231.awsdns-28.com, ns-534.awsdns-02.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for century21.us (unsigned zone)

⏱️ Timing

Total: 1182ms | Queries: -

📄 Records

TypeCountSample Data
A23.138.52.249, 3.21.30.236
NS4ns-1532.awsdns-63.org, ns-1710.awsdns-21.co.uk...
SOA1ns-231.awsdns-28.com awsdns-hostmaster.a

Analysis

IP Addresses

century21.us resolves to two IP numbers: 3.21.30.236 and 3.138.52.249.

Other host names, for instance 21scentury.com, century21id.com, century21doral.com, century21smortgages.com and c21online.com share IP numbers with century21.us.

Name Servers

century21.us's delegation is handled by four name servers: ns-231.awsdns-28.com, ns-534.awsdns-02.net, ns-1532.awsdns-63.org and ns-1710.awsdns-21.co.uk.

century21.us partially shares name servers with other domains; examples include test.digitaledge.cigna.com, keio-observation-study.com, chapang.com, connectvolleyball.com and mutinyhq.com.

Host names with two IPs:

ns-231.awsdns-28.com points to 2600:9000:5300:e700::1 and 205.251.192.231

ns-534.awsdns-02.net points to 2600:9000:5302:1600::1 and 205.251.194.22

ns-1532.awsdns-63.org points to 2600:9000:5305:fc00::1 and 205.251.197.252

ns-1710.awsdns-21.co.uk points to 2600:9000:5306:ae00::1 and 205.251.198.174