`centurytwentyone.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-1549.awsdns-01.co.uk` ⭐
		A	2600:9000:5306:d00::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1549.awsdns-01.co.uk`
		A	205.251.198.13^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1549.awsdns-01.co.uk`
NS	`ns-1343.awsdns-39.org`
		A	2600:9000:5305:3f00::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1343.awsdns-39.org`
		A	205.251.197.63^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1343.awsdns-39.org`
NS	`ns-337.awsdns-42.com`
		A	2600:9000:5301:5100::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-337.awsdns-42.com`
		A	205.251.193.81^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-337.awsdns-42.com`
NS	`ns-964.awsdns-56.net`
		A	2600:9000:5303:c400::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-964.awsdns-56.net`
		A	205.251.195.196^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-964.awsdns-56.net`
SOA	`ns-1549.awsdns-01.co.uk`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=1778351221

Same first word

centurytwentyone.com

DNS History

12 records (6 active, 6 former)

●NSns-1343.awsdns-39.org2018-01-16 → 2026-05-09 · 3 obs

○ 2016-09-09 15:28:52
● 2018-01-16 03:27:42
● 2026-05-09 18:35:06

●NSns-1549.awsdns-01.co.uk2018-01-16 → 2026-05-09 · 3 obs

○ 2016-09-09 15:28:52
● 2018-01-16 03:27:42
● 2026-05-09 18:35:06

●NSns-337.awsdns-42.com2018-01-16 → 2026-05-09 · 3 obs

○ 2016-09-09 15:28:52
● 2018-01-16 03:27:42
● 2026-05-09 18:35:06

●NSns-964.awsdns-56.net2018-01-16 → 2026-05-09 · 3 obs

○ 2016-09-09 15:28:52
● 2018-01-16 03:27:42
● 2026-05-09 18:35:06

○NSns1.savvis.net2015-05-16 → 2016-09-09 · 4 obs

● 2015-05-16 00:29:34
● 2016-09-09 15:28:52
○ 2018-01-16 03:27:42
○ 2026-05-09 18:35:06

○NSns2.savvis.net2015-05-16 → 2016-09-09 · 4 obs

● 2015-05-16 00:29:34
● 2016-09-09 15:28:52
○ 2018-01-16 03:27:42
○ 2026-05-09 18:35:06

○NSns3.savvis.net2015-05-16 → 2016-09-09 · 4 obs

● 2015-05-16 00:29:34
● 2016-09-09 15:28:52
○ 2018-01-16 03:27:42
○ 2026-05-09 18:35:06

○A216.91.43.682015-05-16 → 2018-01-16 · 4 obs

● 2015-05-16 00:29:34
● 2018-01-16 03:27:42
○ 2026-04-04 17:39:58
○ 2026-05-09 18:35:06

○A3.137.7.1562026-04-04 → 2026-04-04 · 4 obs

○ 2018-01-16 03:27:42
● 2026-04-04 17:39:58
○ 2026-05-07 23:28:36
○ 2026-05-09 18:35:06

●A3.138.52.2492026-05-07 → 2026-05-09 · 3 obs

○ 2026-04-04 17:39:58
● 2026-05-07 23:28:36
● 2026-05-09 18:35:06

○A3.18.210.2052026-04-04 → 2026-04-04 · 4 obs

○ 2018-01-16 03:27:42
● 2026-04-04 17:39:58
○ 2026-05-07 23:28:36
○ 2026-05-09 18:35:06

●A3.21.30.2362026-05-07 → 2026-05-09 · 3 obs

○ 2026-04-04 17:39:58
● 2026-05-07 23:28:36
● 2026-05-09 18:35:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	i.gtld-servers.net, e.gtld-servers.net, m.gtld-servers.net, g.gtld-servers.net...	-
centurytwentyone.com	ns-337.awsdns-42.com, ns-964.awsdns-56.net, ns-1549.awsdns-01.co.uk, ns-1343.awsdns-39.org	2 records

✅ Authoritative Response

Server:205.251.198.13

NS records: ns-337.awsdns-42.com, ns-964.awsdns-56.net, ns-1549.awsdns-01.co.uk, ns-1343.awsdns-39.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for centurytwentyone.com (unsigned zone)

⏱️ Timing

Total: 274ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`3.138.52.249, 3.21.30.236`
NS	4	`ns-1343.awsdns-39.org, ns-1549.awsdns-01.co.uk...`
SOA	1	`ns-1549.awsdns-01.co.uk awsdns-hostmaste`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-337.awsdns-42.com, ns-337.awsdns-42.com)

Analysis

IP Addresses

centurytwentyone.com points to two IPs: 3.21.30.236 and 3.138.52.249.

Other host names including century21.net, century21realestate.info, c21vpl.com, century21losangeles.net and www.c21online.com share IP numbers with centurytwentyone.com.

Name Servers

centurytwentyone.com is delegated to four name servers: ns-337.awsdns-42.com, ns-964.awsdns-56.net, ns-1343.awsdns-39.org and ns-1549.awsdns-01.co.uk.

centurytwentyone.com at least partially shares name servers with other domains, including 234.35.3.in-addr.arpa, izzyboythunder.com, d3obig75ne090e.cloudfront.net, focusfloral.com and drltpebt7gg3j.cloudfront.net.

these name servers are commonly used with ns1-24-ap-northeast-2.ec2-rdns.amazonaws.com, ns2-24-ap-northeast-2.ec2-rdns.amazonaws.com, ns3-24-ap-northeast-2.ec2-rdns.amazonaws.com and ns4-24-ap-northeast-2.ec2-rdns.amazonaws.com.

Hosts with two IP numbers:

Host ns-337.awsdns-42.com points to 2600:9000:5301:5100::1 and 205.251.193.81

Host ns-964.awsdns-56.net points to 2600:9000:5303:c400::1 and 205.251.195.196

Host ns-1343.awsdns-39.org points to 2600:9000:5305:3f00::1 and 205.251.197.63

Host ns-1549.awsdns-01.co.uk points to 2600:9000:5306:d00::1 and 205.251.198.13

centurytwentyone.com - robtex.com