21stsystems.com - dns.ninja

`21stsystems.com`

DNSSEC	⚠️ Not signed
A	99.43.124.129^{🇺🇸 AS701899.32.0.0/12 AT&T Enterprises, LLC}
		PTR	`mail.21stsystems.com`
NS	`ns53.worldnic.com` ⭐
		A	162.159.26.165^{Cloudflare162.159.26.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
NS	`ns54.worldnic.com`
		A	162.159.27.8^{Cloudflare162.159.27.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
MX	`21stsystems-com.mail.protection.outlook.com` ⭐
		A	2a01:111:f403:c922::^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-bl0pr03cu00200.inbound.protection.outlook.com`
		A	2a01:111:f403:c931::^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-sn1pr02cu00100.inbound.protection.outlook.com`
		A	2a01:111:f403:f901::2^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-bl2pr02cu00402.inbound.protection.outlook.com`
		A	2a01:111:f403:f913::1^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-cy5pr05cu00101.inbound.protection.outlook.com`
		A	52.101.11.7^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-sa9pr04cu00107.inbound.protection.outlook.com`
		A	52.101.41.26^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-sj0pr03cu01702.inbound.protection.outlook.com`
		A	52.101.50.7^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-co1pr21cu00207.inbound.protection.outlook.com`
		A	52.101.194.3^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-ch1pr04cu00103.inbound.protection.outlook.com`
MX	`mail.21stsystems.com`⁽³⁰⁾
TXT	`MS=B0648E4DA32DFFFDD070E17A2FF055E21FA029F8`
TXT	`q1V-oT6-lWL`
TXT	`MS=ms20280388`
TXT	`v=spf1 include:spf.protection.outlook.com -all`
SOA	`NS53.WORLDNIC.com`namehost@WORLDNIC.com serial=121112712

`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=1785976839

Subdomains

vpnhost.21stsystems.com

Same first word

21stsystems.com

DNS History

7 records (5 active, 2 former)

●NSns53.worldnic.com2015-06-21 → 2026-08-06 · 2 obs

● 2015-06-21 05:54:52
● 2026-08-06 00:47:08

●NSns54.worldnic.com2015-06-21 → 2026-08-06 · 2 obs

● 2015-06-21 05:54:52
● 2026-08-06 00:47:08

●MX21stsystems-com.mail.protection.outlook.com2026-02-19 → 2026-08-06 · 3 obs

○ 2017-05-16 15:36:26
● 2026-02-19 17:32:04
● 2026-08-06 00:47:08

○MXmail-backup.21stsystems.com2015-06-21 → 2017-05-16 · 4 obs

● 2015-06-21 05:54:52
● 2017-05-16 15:36:26
○ 2026-02-19 17:32:04
○ 2026-08-06 00:47:08

●MXmail.21stsystems.com2015-06-21 → 2026-08-06 · 2 obs

● 2015-06-21 05:54:52
● 2026-08-06 00:47:08

○MXmail3.21stsystems.com2015-06-21 → 2017-05-16 · 4 obs

● 2015-06-21 05:54:52
● 2017-05-16 15:36:26
○ 2026-02-19 17:32:04
○ 2026-08-06 00:47:08

●A99.43.124.1292015-06-21 → 2026-08-06 · 2 obs

● 2015-06-21 05:54:52
● 2026-08-06 00:47:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
21stsystems.com	ns53.worldnic.com, ns54.worldnic.com	2 records

✅ Authoritative Response

Server:162.159.27.8

NS records: ns53.worldnic.com, ns54.worldnic.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21stsystems.com (unsigned zone)

⏱️ Timing

Total: 159ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`99.43.124.129`
NS	2	`ns53.worldnic.com, ns54.worldnic.com`
MX	2	`21stsystems-com.mail.protection.outlook., mail.21stsystems.com (pri: 30)`
TXT	4	`q1V-oT6-lWL, MS=ms20280388...`
SOA	1	`NS53.WORLDNIC.com namehost.WORLDNIC.com`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns53.worldnic.com, ns54.worldnic.com)

Analysis

Hierarchy

21stsystems.com is a parent domain of vpnhost.21stsystems.com.

IP Addresses

21stsystems.com points to a single IP number: 99.43.124.129.

Name Servers

21stsystems.com is served by two delegated name servers, ns53.worldnic.com and ns54.worldnic.com.

21stsystems.com shares its name server setup with other domains, including metrolinaneurology.com, niemuth.org, brainboggles.com and two others.

The DNS delegation for 21stsystems.com at least partly coincides with that of other domains, arlington.beer being one example.

ns53.worldnic.com and ns54.worldnic.com each resolve to one IP number: ns53.worldnic.com points to 162.159.26.165 and ns54.worldnic.com points to 162.159.27.8.

Mail Servers

21stsystems.com has two mail servers: mail.21stsystems.com and 21stsystems-com.mail.protection.outlook.com.

Host names with 8 IP numbers:

21stsystems-com.mail.protection.outlook.com carries IP addresses 52.101.11.7, 52.101.41.26 and 52.101.50.7, with 5 other addresses beyond those.