DNSWHOIS.INFO - 21stsystems.com

Search for IP or hostnames:

21stsystems.com checked at 2025-10-22T21:53:50.900Z 168ms 87/87/87 100% R:16

`21stsystems.com`

MX	`mail.21stsystems.com`
NS	`ns53.worldnic.com`
		A	162.159.26.165^Cloudflare
NS	`ns54.worldnic.com`
		A	162.159.27.8^Cloudflare
MX	`21stsystems-com.mail.protection.outlook.com`
		A	2a01:111:f403:c902::1 ^{🇺🇸 Microsoft}
			PTR	`mail-sj2pr05cu00401.inbound.protection.outlook.com`
		A	2a01:111:f403:c92c::4 ^{🇺🇸 Microsoft}
			PTR	`mail-dm6pr05cu00404.inbound.protection.outlook.com`
		A	2a01:111:f403:c946::4 ^{🇺🇸 Microsoft}
			PTR	`mail-ch0pr04cu00504.inbound.protection.outlook.com`
		A	2a01:111:f403:c946::6 ^{🇺🇸 Microsoft}
			PTR	`mail-ch5pr02cu00406.inbound.protection.outlook.com`
		A	52.101.9.0^{🇺🇸 Microsoft}
			PTR	`mail-bl2pr02cu00100.inbound.protection.outlook.com`
		A	52.101.11.2^{🇺🇸 Microsoft}
			PTR	`mail-sn1pr03cu00102.inbound.protection.outlook.com`
		A	52.101.41.3^{🇺🇸 Microsoft}
			PTR	`mail-sj2pr05cu00103.inbound.protection.outlook.com`
		A	52.101.41.180^{🇺🇸 Microsoft}
			PTR	`mail-byapr04cu00204.inbound.protection.outlook.com`
A	99.43.124.129^{🇺🇸 AT&T US - 7018}
		PTR	`mail.21stsystems.com`

vpnhost.21stsystems.com

21stsystems.com

21stsystems.com

21stsystems.com is the parent of vpnhost.21stsystems.com.

21stsystems.com points to IP number 99.43.124.129.

21stsystems.com is delegated to two name servers: ns53.worldnic.com and ns54.worldnic.com.

21stsystems.com uses the same name server setup as other domains such as niemuth.org, gulfsouthcustoms.com, jldgroupinc.com, ireko.com and bustersrepo.com.

Host names with one IP number:

Two mail servers mail.21stsystems.com and 21stsystems-com.mail.protection.outlook.com handle 21stsystems.com.

Host names with eight IP numbers: 21stsystems-com.mail.protection.outlook.com points to 2a01:111:f403:c902::1, 2a01:111:f403:c92c::4, 2a01:111:f403:c946::4, 2a01:111:f403:c946::6, 52.101.9.0, 52.101.11.2, 52.101.41.3 and 52.101.41.180.

dbq