`21teach.com`

DNSSEC	⚠️ Not signed
A	51.12.92.210^{🇸🇪 Microsoft51.12.0.0/15}
NS	`dns1.registrar-servers.com` ⭐
		A	2610:a1:1024::200^{🇺🇸 MAINT-ID-120082610:a1:1024::/48 Neustar}
			PTR	`dns1.namecheaphosting.com`
			PTR	`dns1.registrar-servers.com`
		A	156.154.132.200^{🇺🇸 MAINT-ID-12008156.154.132.0/24 Neustar}
			PTR	`dns1.namecheaphosting.com`
			PTR	`dns1.registrar-servers.com`
NS	`dns2.registrar-servers.com`
		A	2610:a1:1025::200^{🇺🇸 MAINT-ID-120082610:a1:1025::/48 Neustar}
			PTR	`dns2.namecheaphosting.com`
			PTR	`dns2.registrar-servers.com`
		A	156.154.133.200^{🇺🇸 MAINT-ID-12008156.154.133.0/24 Neustar}
			PTR	`dns2.namecheaphosting.com`
			PTR	`dns2.registrar-servers.com`
MX	`eforward1.registrar-servers.com` ⭐
		A	162.255.118.51^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward1.registrar-servers.com`
			PTR	`eforward3.registrar-servers.com`
MX	`eforward2.registrar-servers.com` ⭐
		A	162.255.118.52^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward2.registrar-servers.com`
MX	`eforward3.registrar-servers.com` ⭐
		A	162.255.118.51^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward1.registrar-servers.com`
			PTR	`eforward3.registrar-servers.com`
MX	`eforward4.registrar-servers.com`⁽¹⁵⁾
		A	162.255.118.52^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward2.registrar-servers.com`
MX	`eforward5.registrar-servers.com`⁽²⁰⁾
		A	162.255.118.51^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward1.registrar-servers.com`
			PTR	`eforward3.registrar-servers.com`
TXT	`v=spf1 include:spf.efwd.registrar-servers.com ~all`
SOA	`dns1.registrar-servers.com`hostmaster@registrar-servers.com serial=1759425735

`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=1774876632

Same first word

21teach.com

Similar names

12cheat.de

teach12.net

teach12.biz

teach21.com

12teach.nl

12teach.com

teach12.com

DNS History

15 records (8 active, 7 former)

●NSdns1.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

●NSdns2.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

○NSf1g1ns1.dnspod.net2020-02-29 → 2020-02-29 · 4 obs

○ 2017-03-29 16:46:58
● 2020-02-29 19:55:22
○ 2026-03-25 06:31:12
○ 2026-03-30 13:23:18

○NSf1g1ns2.dnspod.net2020-02-29 → 2020-02-29 · 4 obs

○ 2017-03-29 16:46:58
● 2020-02-29 19:55:22
○ 2026-03-25 06:31:12
○ 2026-03-30 13:23:18

○NSns1.fatcow.com2015-05-29 → 2017-03-29 · 4 obs

● 2015-05-29 03:19:30
● 2017-03-29 16:46:58
○ 2020-02-29 19:55:22
○ 2026-03-30 13:23:18

○NSns2.fatcow.com2015-05-29 → 2017-03-29 · 4 obs

● 2015-05-29 03:19:30
● 2017-03-29 16:46:58
○ 2020-02-29 19:55:22
○ 2026-03-30 13:23:18

●MXeforward1.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

●MXeforward2.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

●MXeforward3.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

●MXeforward4.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

●MXeforward5.registrar-servers.com2026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

○MXmx.21teach.com2015-05-29 → 2017-03-29 · 4 obs

● 2015-05-29 03:19:30
● 2017-03-29 16:46:58
○ 2020-02-29 19:55:22
○ 2026-03-30 13:23:18

●A51.12.92.2102026-03-25 → 2026-03-30 · 3 obs

○ 2020-02-29 19:55:22
● 2026-03-25 06:31:12
● 2026-03-30 13:23:18

○A65.254.227.2242016-07-22 → 2017-03-29 · 5 obs

○ 2016-03-22 07:32:46
● 2016-07-22 16:57:32
● 2017-03-29 16:46:58
○ 2020-02-29 19:55:22
○ 2026-03-30 13:23:18

○A65.254.248.1332015-05-29 → 2016-03-22 · 4 obs

● 2015-05-29 03:19:30
● 2016-03-22 07:32:46
○ 2016-07-22 16:57:32
○ 2026-03-30 13:23:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, h.gtld-servers.net, e.gtld-servers.net, l.gtld-servers.net...	-
21teach.com	dns1.registrar-servers.com, dns2.registrar-servers.com	4 records

✅ Authoritative Response

Server:156.154.133.200

NS records: dns1.registrar-servers.com, dns2.registrar-servers.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 142ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`51.12.92.210`
NS	2	`dns1.registrar-servers.com, dns2.registrar-servers.com`
MX	5	`eforward1.registrar-servers.com (pri: 10, eforward2.registrar-servers.com (pri: 10...`
TXT	1	`v=spf1 include:spf.efwd.registrar-server`
SOA	1	`dns1.registrar-servers.com hostmaster.re`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (dns1.registrar-servers.com, dns1.registrar-servers.com, dns2.registrar-servers.com...)

Analysis

IP Addresses

21teach.com points to an IP address: 51.12.92.210.

other host names include my-ecourses.com, educator.pw, olderbutstronger.com, linhd.com and front-unschooler.greenwave-a7b7af58.swedencentral.azurecontainerapps.io; they share IP numbers with 21teach.com.

Name Servers

Two name servers dns1.registrar-servers.com and dns2.registrar-servers.com handle the delegation for 21teach.com.

21teach.com shares the same name server setup as other domains, for instance everuby.com, treecarehawaii.com, 03192004.com, edriel.com and syisrael.com.

21teach.com shares name servers with other domains at least partially, for example timeaddsup.com.

Host names with two IP numbers:

dns1.registrar-servers.com points to 2610:a1:1024::200 and 156.154.132.200.

dns2.registrar-servers.com points to 2610:a1:1025::200 and 156.154.133.200.

Mail Servers

21teach.com is served by five mail servers: eforward1.registrar-servers.com, eforward2.registrar-servers.com, eforward3.registrar-servers.com, eforward4.registrar-servers.com and eforward5.registrar-servers.com.

21teach.com shares at least partially some mail servers with other domains, for instance moxiesoftware.com, peakastra.com, h27qkp.com, letsdrake.com and nejat.nl.