WWW.RTSAK.COM - 21stsystems.com

Search for IP or hostnames:

21stsystems.com checked at 2025-10-17T02:14:40.256Z 172ms 87/87/87 100% R:22

`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::6 ^{🇺🇸 Microsoft}
			PTR	`mail-sj0pr21cu00106.inbound.protection.outlook.com`
		A	2a01:111:f403:c927:: ^{🇺🇸 Microsoft}
			PTR	`mail-bn6pr21cu00500.inbound.protection.outlook.com`
		A	2a01:111:f403:c927::1 ^{🇺🇸 Microsoft}
			PTR	`mail-bn8pr05cu00301.inbound.protection.outlook.com`
		A	2a01:111:f403:c92c::1 ^{🇺🇸 Microsoft}
			PTR	`mail-dm6pr03cu00401.inbound.protection.outlook.com`
		A	52.101.8.34^{🇺🇸 Microsoft}
			PTR	`mail-dm2pr04cu00102.inbound.protection.outlook.com`
		A	52.101.10.14^{🇺🇸 Microsoft}
			PTR	`mail-bn6pr04cu00206.inbound.protection.outlook.com`
		A	52.101.40.2^{🇺🇸 Microsoft}
			PTR	`mail-cy1pr05cu00402.inbound.protection.outlook.com`
		A	52.101.40.24^{🇺🇸 Microsoft}
			PTR	`mail-cy5pr05cu00100.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 resolves to a single IP address: 99.43.124.129.

21stsystems.com's delegation uses two name servers, ns53.worldnic.com and ns54.worldnic.com.

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

Host names with a single IP:

21stsystems.com is handled by two mail servers: mail.21stsystems.com and 21stsystems-com.mail.protection.outlook.com.

Host name with eight IP numbers:

The host name 21stsystems-com.mail.protection.outlook.com points to 2a01:111:f403:c902::6, 2a01:111:f403:c927::, 2a01:111:f403:c927::1, 2a01:111:f403:c92c::1, 52.101.8.34, 52.101.10.14, 52.101.40.2 and 52.101.40.24.

dbq