centtury21.com - robtex.com
centtury21.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-1843.awsdns-38.co.uk ⭐ | ||||||
| A | 2600:9000:5307:3300::1🇺🇸 Amazon2600:9000:5307::/48 - CloudFront | ||||||
| PTR | ns-1843.awsdns-38.co.uk | ||||||
| A | 205.251.199.51🇺🇸 Amazon205.251.199.0/24 prefix | ||||||
| PTR | ns-1843.awsdns-38.co.uk | ||||||
| NS | ns-1208.awsdns-23.org | ||||||
| A | 2600:9000:5304:b800::1🇺🇸 Amazon2600:9000:5304::/48 - CloudFront | ||||||
| PTR | ns-1208.awsdns-23.org | ||||||
| A | 205.251.196.184🇺🇸 Amazon205.251.196.0/24 prefix | ||||||
| PTR | ns-1208.awsdns-23.org | ||||||
| NS | ns-358.awsdns-44.com | ||||||
| A | 2600:9000:5301:6600::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront | ||||||
| PTR | ns-358.awsdns-44.com | ||||||
| A | 205.251.193.102🇺🇸 Amazon205.251.193.0/24 prefix | ||||||
| PTR | ns-358.awsdns-44.com | ||||||
| NS | ns-862.awsdns-43.net | ||||||
| A | 2600:9000:5303:5e00::1🇺🇸 Amazon2600:9000:5303::/48 - CloudFront | ||||||
| PTR | ns-862.awsdns-43.net | ||||||
| A | 205.251.195.94🇺🇸 Amazon205.251.195.0/24 prefix | ||||||
| PTR | ns-862.awsdns-43.net | ||||||
| SOA | ns-1843.awsdns-38.co.ukawsdns-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.netnstld@verisign-grs.com serial=1778286837 | ||||||
Same first word
centtury21.com |
DNS History
14 records (6 active, 8 former)
●NSns-1208.awsdns-23.org2020-01-19 → 2026-05-09 · 3 obs
● 2020-01-19 21:32:00
● 2026-05-09 00:55:26
●NSns-1843.awsdns-38.co.uk2020-01-19 → 2026-05-09 · 3 obs
● 2020-01-19 21:32:00
● 2026-05-09 00:55:26
●NSns-358.awsdns-44.com2020-01-19 → 2026-05-09 · 3 obs
● 2020-01-19 21:32:00
● 2026-05-09 00:55:26
●NSns-862.awsdns-43.net2020-01-19 → 2026-05-09 · 3 obs
● 2020-01-19 21:32:00
● 2026-05-09 00:55:26
○NSns1.savvis.net2015-08-05 → 2017-03-14 · 5 obs
● 2015-08-05 09:12:16
● 2017-03-14 07:19:00
○ 2020-01-19 21:32:00
○ 2026-05-09 00:55:26
○NSns2.savvis.net2015-08-05 → 2017-03-14 · 5 obs
● 2015-08-05 09:12:16
● 2017-03-14 07:19:00
○ 2020-01-19 21:32:00
○ 2026-05-09 00:55:26
○NSns3.savvis.net2015-08-05 → 2017-03-14 · 5 obs
● 2015-08-05 09:12:16
● 2017-03-14 07:19:00
○ 2020-01-19 21:32:00
○ 2026-05-09 00:55:26
○NSns4.savvis.net2015-08-05 → 2017-03-14 · 5 obs
● 2015-08-05 09:12:16
● 2017-03-14 07:19:00
○ 2020-01-19 21:32:00
○ 2026-05-09 00:55:26
○NSns5.savvis.net2015-08-05 → 2017-03-14 · 5 obs
● 2015-08-05 09:12:16
● 2017-03-14 07:19:00
○ 2020-01-19 21:32:00
○ 2026-05-09 00:55:26
○A3.13.43.1382020-01-19 → 2020-01-19 · 3 obs
○ 2026-05-05 12:25:54
○ 2026-05-09 00:55:26
●A3.138.52.2492026-05-05 → 2026-05-09 · 3 obs
● 2026-05-05 12:25:54
● 2026-05-09 00:55:26
○A3.14.0.622020-01-19 → 2020-01-19 · 3 obs
○ 2026-05-05 12:25:54
○ 2026-05-09 00:55:26
●A3.21.30.2362026-05-08 → 2026-05-09 · 3 obs
● 2026-05-08 06:47:54
● 2026-05-09 00:55:26
○A3.23.162.842026-05-05 → 2026-05-05 · 4 obs
● 2026-05-05 12:25:54
○ 2026-05-08 06:47:54
○ 2026-05-09 00:55:26
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | f.gtld-servers.net, g.gtld-servers.net, h.gtld-servers.net, i.gtld-servers.net... | - |
| centtury21.com | ns-358.awsdns-44.com, ns-862.awsdns-43.net, ns-1208.awsdns-23.org, ns-1843.awsdns-38.co.uk | 2 records |
✅ Authoritative Response
Server:205.251.196.184
NS records: ns-358.awsdns-44.com, ns-862.awsdns-43.net, ns-1208.awsdns-23.org, ns-1843.awsdns-38.co.uk
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for centtury21.com (unsigned zone)
⏱️ Timing
Total: 366ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 3.138.52.249, 3.21.30.236 |
| NS | 4 | ns-1208.awsdns-23.org, ns-1843.awsdns-38.co.uk... |
| SOA | 1 | ns-1843.awsdns-38.co.uk awsdns-hostmaste |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns-358.awsdns-44.com, ns-358.awsdns-44.com)
Analysis
IP Addresses
centtury21.com points to two IPs: 3.21.30.236 and 3.138.52.249.
Other host names, for instance century24.com, c21connections.com, 21stcentuary.com, century21hi.com and century21michigan.com share IP numbers with centtury21.com.
Name Servers
centtury21.com is delegated to four name servers: ns-358.awsdns-44.com, ns-862.awsdns-43.net, ns-1208.awsdns-23.org and ns-1843.awsdns-38.co.uk.
centtury21.com at least partially shares name servers with other domains such as the-times.biz, simpleshow-academy.de, getmeconnected.net, 1eurail.com and wevit.se.
Host names with two IP numbers:
ns-358.awsdns-44.com points to 2600:9000:5301:6600::1 and 205.251.193.102
ns-862.awsdns-43.net points to 2600:9000:5303:5e00::1 and 205.251.195.94
ns-1208.awsdns-23.org points to 2600:9000:5304:b800::1 and 205.251.196.184
ns-1843.awsdns-38.co.uk points to 2600:9000:5307:3300::1 and 205.251.199.51