IPLIST.NET - 21stsystems.com

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21stsystems.com checked at 2025-11-01T11:40:06.006Z 422ms 87/87/87 100% R:13

`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:c931:: ^{🇺🇸 Microsoft}
			PTR	`mail-sn1pr02cu00100.inbound.protection.outlook.com`
		A	2a01:111:f403:c931::1 ^{🇺🇸 Microsoft}
			PTR	`mail-sa9pr03cu00201.inbound.protection.outlook.com`
		A	2a01:111:f403:f909:: ^{🇺🇸 Microsoft}
			PTR	`mail-bn6pr04cu00200.inbound.protection.outlook.com`
		A	2a01:111:f403:f90c:: ^{🇺🇸 Microsoft}
			PTR	`mail-sn1pr03cu00100.inbound.protection.outlook.com`
		A	52.101.8.44^{🇺🇸 Microsoft}
			PTR	`mail-dm5pr04cu00104.inbound.protection.outlook.com`
		A	52.101.9.24^{🇺🇸 Microsoft}
			PTR	`mail-bl2pr02cu00400.inbound.protection.outlook.com`
		A	52.101.10.10^{🇺🇸 Microsoft}
			PTR	`mail-bn8pr05cu00102.inbound.protection.outlook.com`
		A	52.101.11.15^{🇺🇸 Microsoft}
			PTR	`mail-sa9pr02cu00207.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:c931::, 2a01:111:f403:c931::1, 2a01:111:f403:f909::, 2a01:111:f403:f90c::, 52.101.8.44, 52.101.9.24, 52.101.10.10 and 52.101.11.15.

dbq