`century21co.com`

DNSSEC	⚠️ Not signed
A	3.21.30.236^{🇺🇸 Amazon3.20.0.0/14 EC2 CMH prefix}
		PTR	`ec2-3-21-30-236.us-east-2.compute.amazonaws.com`
A	3.138.52.249^{🇺🇸 Amazon3.136.0.0/13 EC2 CMH prefix}
NS	`ns-1254.awsdns-28.org` ⭐
		A	2600:9000:5304:e600::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1254.awsdns-28.org`
		A	205.251.196.230^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1254.awsdns-28.org`
NS	`ns-184.awsdns-23.com`
		A	2600:9000:5300:b800::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-184.awsdns-23.com`
		A	205.251.192.184^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-184.awsdns-23.com`
NS	`ns-2022.awsdns-60.co.uk`
		A	2600:9000:5307:e600::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-2022.awsdns-60.co.uk`
		A	205.251.199.230^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-2022.awsdns-60.co.uk`
NS	`ns-661.awsdns-18.net`
		A	2600:9000:5302:9500::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-661.awsdns-18.net`
		A	205.251.194.149^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-661.awsdns-18.net`
SOA	`ns-1254.awsdns-28.org`awsdns-hostmaster@amazon.com serial=1

`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=1778377041

Same first word

century21co.com

DNS History

13 records (6 active, 7 former)

●NSns-1254.awsdns-28.org2018-09-22 → 2026-05-10 · 3 obs

○ 2016-04-11 02:14:38
● 2018-09-22 09:54:14
● 2026-05-10 02:01:48

●NSns-184.awsdns-23.com2018-09-22 → 2026-05-10 · 3 obs

○ 2016-04-11 02:14:38
● 2018-09-22 09:54:14
● 2026-05-10 02:01:48

●NSns-2022.awsdns-60.co.uk2018-09-22 → 2026-05-10 · 3 obs

○ 2016-04-11 02:14:38
● 2018-09-22 09:54:14
● 2026-05-10 02:01:48

●NSns-661.awsdns-18.net2018-09-22 → 2026-05-10 · 3 obs

○ 2016-04-11 02:14:38
● 2018-09-22 09:54:14
● 2026-05-10 02:01:48

○NSns1.savvis.net2015-05-28 → 2016-04-11 · 4 obs

● 2015-05-28 06:22:54
● 2016-04-11 02:14:38
○ 2018-09-22 09:54:14
○ 2026-05-10 02:01:48

○NSns2.savvis.net2015-05-28 → 2016-04-11 · 4 obs

● 2015-05-28 06:22:54
● 2016-04-11 02:14:38
○ 2018-09-22 09:54:14
○ 2026-05-10 02:01:48

○NSns3.savvis.net2015-05-28 → 2016-04-11 · 4 obs

● 2015-05-28 06:22:54
● 2016-04-11 02:14:38
○ 2018-09-22 09:54:14
○ 2026-05-10 02:01:48

○A18.188.66.142018-09-22 → 2018-09-22 · 4 obs

○ 2016-04-11 02:14:38
● 2018-09-22 09:54:14
○ 2026-05-05 12:26:42
○ 2026-05-10 02:01:48

○A18.219.169.932018-09-22 → 2018-09-22 · 4 obs

○ 2016-04-11 02:14:38
● 2018-09-22 09:54:14
○ 2026-05-05 12:26:42
○ 2026-05-10 02:01:48

●A3.138.52.2492026-05-05 → 2026-05-10 · 3 obs

○ 2018-09-22 09:54:14
● 2026-05-05 12:26:42
● 2026-05-10 02:01:48

●A3.21.30.2362026-05-08 → 2026-05-10 · 3 obs

○ 2026-05-05 12:26:42
● 2026-05-08 06:47:54
● 2026-05-10 02:01:48

○A3.23.162.842026-05-05 → 2026-05-05 · 4 obs

○ 2018-09-22 09:54:14
● 2026-05-05 12:26:42
○ 2026-05-08 06:47:54
○ 2026-05-10 02:01:48

○A64.37.197.592015-05-28 → 2016-04-11 · 4 obs

● 2015-05-28 06:22:54
● 2016-04-11 02:14:38
○ 2018-09-22 09:54:14
○ 2026-05-10 02:01:48

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
century21co.com	ns-184.awsdns-23.com, ns-661.awsdns-18.net, ns-1254.awsdns-28.org, ns-2022.awsdns-60.co.uk	2 records

✅ Authoritative Response

Server:205.251.196.230

NS records: ns-184.awsdns-23.com, ns-661.awsdns-18.net, ns-1254.awsdns-28.org, ns-2022.awsdns-60.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for century21co.com (unsigned zone)

⏱️ Timing

Total: 425ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`3.21.30.236, 3.138.52.249`
NS	4	`ns-1254.awsdns-28.org, ns-184.awsdns-23.com...`
SOA	1	`ns-1254.awsdns-28.org awsdns-hostmaster.`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-184.awsdns-23.com, ns-184.awsdns-23.com)

Analysis

IP Addresses

century21co.com points to two IP numbers: 3.21.30.236 and 3.138.52.249.

Other host names such as 21realestate.com, century22.info, century21northdakota.com, c21.biz and centurey21.com share IPs with century21co.com.

Name Servers

century21co.com is delegated to four name servers: ns-184.awsdns-23.com, ns-661.awsdns-18.net, ns-1254.awsdns-28.org and ns-2022.awsdns-60.co.uk.

century21co.com at least partially shares name servers with other domains, for example koanticportal.com, liange0223.com, koboaun01.net, betterbelliot.com and biotcloud.io.

These name servers are commonly used with ns-884.awsdns-46.net and ns-347.awsdns-43.com and ns-1932.awsdns-49.co.uk.

Host names with two IP numbers:

ns-184.awsdns-23.com points to: 2600:9000:5300:b800::1 and 205.251.192.184

ns-661.awsdns-18.net points to: 2600:9000:5302:9500::1 and 205.251.194.149

ns-1254.awsdns-28.org points to: 2600:9000:5304:e600::1 and 205.251.196.230

ns-2022.awsdns-60.co.uk points to: 2600:9000:5307:e600::1 and 205.251.199.230

century21co.com - robtex.com

century21co.com

com

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

`century21co.com`

`com`