`theopencollege.com`

DNSSEC	⚠️ Not signed
A	104.21.8.36^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.130.93^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`jeff.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b7c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c17c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`jeff.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:217c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`jeff.ns.cloudflare.com`
		A	108.162.193.124^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
		A	172.64.33.124^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
		A	173.245.59.124^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
NS	`kate.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a7c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kate.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c07c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`kate.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:207c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`kate.ns.cloudflare.com`
		A	108.162.192.124^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kate.ns.cloudflare.com`
		A	172.64.32.124^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kate.ns.cloudflare.com`
		A	173.245.58.124^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kate.ns.cloudflare.com`
MX	`theopencollege-com.mail.protection.outlook.com` ⭐
		A	2a01:111:f403:ca04::1^{🇮🇪 Microsoft2a01:111:f000::/36}
			PTR	`mail-db7pr03cu00401.inbound.protection.outlook.com`
		A	2a01:111:f403:ca04::5^{🇮🇪 Microsoft2a01:111:f000::/36}
			PTR	`mail-db3pr0202cu00205.inbound.protection.outlook.com`
		A	2a01:111:f403:ca04::10^{🇮🇪 Microsoft2a01:111:f000::/36}
			PTR	`mail-dbapr03cu00100.inbound.protection.outlook.com`
		A	2a01:111:f403:ca09::7^{🇳🇱 Microsoft2a01:111:f000::/36}
			PTR	`mail-am9pr04cu00107.inbound.protection.outlook.com`
		A	52.101.68.3^{🇮🇪 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-db7pr03cu00403.inbound.protection.outlook.com`
		A	52.101.68.21^{🇮🇪 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-db4pr02cu00205.inbound.protection.outlook.com`
		A	52.101.73.28^{🇳🇱 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-am7pr05cu00204.inbound.protection.outlook.com`
		A	52.101.73.30^{🇳🇱 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-am7pr05cu00306.inbound.protection.outlook.com`
TXT	`MS=ms16557497`
TXT	`brevo-code:49bf28bf5298be97c5b9199bb9d7a546`
TXT	`facebook-domain-verification=wuoxs0nv898ing79n42ba6bpesjm6u`
TXT	`google-site-verification=QOVYqcnbivG5Pc4CkUpuVnZbkTWp8AAXa_XpDOn14JI`
TXT	`google-site-verification=jhSfRsoN67tx6IdTjZbaxSunesDXgVnVKhXI74dvYwI`
TXT	`v=spf1 include:spf.protection.outlook.com ip4:81.17.249.8 ip4:81.17.249.7 ip4...`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.8.36, 172.67.130.93
SOA	`jeff.ns.cloudflare.com`dns@cloudflare.com serial=2399847437

`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=1774613327

📈 Tranco rank: #833,629

Subdomains

www.theopencollege.com

DNS History

13 records (5 active, 8 former)

○NSauth01.weblink.ie2007-08-15 → 2007-08-15 · 3 obs

● 2007-08-15 23:30:48
○ 2015-06-16 14:21:36
○ 2026-03-27 12:25:06

○NSauth02.weblink.ie2007-08-15 → 2007-08-15 · 3 obs

● 2007-08-15 23:30:48
○ 2015-06-16 14:21:36
○ 2026-03-27 12:25:06

●NSjeff.ns.cloudflare.com2026-03-27 → 2026-03-27 · 2 obs

○ 2017-01-16 06:01:38
● 2026-03-27 12:25:06

●NSkate.ns.cloudflare.com2026-03-27 → 2026-03-27 · 2 obs

○ 2017-01-16 06:01:38
● 2026-03-27 12:25:06

○NSns1.blacknight.com2015-06-16 → 2017-01-16 · 4 obs

○ 2007-08-15 23:30:48
● 2015-06-16 14:21:36
● 2017-01-16 06:01:38
○ 2026-03-27 12:25:06

○NSns2.blacknight.com2015-06-16 → 2017-01-16 · 4 obs

○ 2007-08-15 23:30:48
● 2015-06-16 14:21:36
● 2017-01-16 06:01:38
○ 2026-03-27 12:25:06

○MXinbound-smtp.cp.blacknight.com2015-06-16 → 2015-06-16 · 4 obs

○ 2007-08-15 23:30:48
● 2015-06-16 14:21:36
○ 2015-11-25 19:44:18
○ 2026-03-27 12:25:06

●MXtheopencollege-com.mail.protection.outlook.com2015-11-25 → 2026-03-27 · 3 obs

○ 2015-06-16 14:21:36
● 2015-11-25 19:44:18
● 2026-03-27 12:25:06

○MXtheopencollege.com2007-08-15 → 2007-08-15 · 3 obs

● 2007-08-15 23:30:48
○ 2015-06-16 14:21:36
○ 2026-03-27 12:25:06

●A104.21.8.362026-03-27 → 2026-03-27 · 2 obs

○ 2017-01-16 06:01:38
● 2026-03-27 12:25:06

●A172.67.130.932026-03-27 → 2026-03-27 · 2 obs

○ 2017-01-16 06:01:38
● 2026-03-27 12:25:06

○A194.149.76.1032007-08-15 → 2007-08-15 · 3 obs

● 2007-08-15 23:30:48
○ 2015-06-16 14:21:36
○ 2026-03-27 12:25:06

○A46.22.132.2152015-06-16 → 2017-01-16 · 4 obs

○ 2007-08-15 23:30:48
● 2015-06-16 14:21:36
● 2017-01-16 06:01:38
○ 2026-03-27 12:25:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	e.gtld-servers.net, g.gtld-servers.net, j.gtld-servers.net, a.gtld-servers.net...	-
theopencollege.com	jeff.ns.cloudflare.com, kate.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.192.124

NS records: jeff.ns.cloudflare.com, kate.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 57ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.8.36, 172.67.130.93`
NS	2	`jeff.ns.cloudflare.com, kate.ns.cloudflare.com`
MX	1	`theopencollege-com.mail.protection.outlo`
TXT	6	`MS=ms16557497, brevo-code:49bf28bf5298be97c5b9199bb9d7a...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`jeff.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (jeff.ns.cloudflare.com, jeff.ns.cloudflare.com, jeff.ns.cloudflare.com...)

Analysis

Hierarchy

theopencollege.com is the parent of www.theopencollege.com.

IP Addresses

theopencollege.com resolves to two IP numbers: 104.21.8.36 and 172.67.130.93.

other host names including textilemagic.com, img.gig(0x706f726e)o.net, www.anaska.com, frisomat.de and megastresser.com share IP numbers with theopencollege.com.

Name Servers

theopencollege.com is delegated to two name servers jeff.ns.cloudflare.com and kate.ns.cloudflare.com.

theopencollege.com shares the same name server setup as other domains, for instance machrus.com, p2.lt, pawg.(0x706f726e), itfirst.com.my and etfphd.com.

theopencollege.com at least partially shares name servers with other domains, for instance muaaka.com, apple.tf, q8.be, amarrie.com and epmfox.com.

These name servers are commonly used alongside mitchell.ns.cloudflare.com and tim.ns.cloudflare.com.

Host names with six IP numbers:

Host name jeff.ns.cloudflare.com points to: 2606:4700:58::adf5:3b7c, 2803:f800:50::6ca2:c17c, 2a06:98c1:50::ac40:217c, 108.162.193.124, 172.64.33.124 and 173.245.59.124.

Host name kate.ns.cloudflare.com points to: 2606:4700:50::adf5:3a7c, 2803:f800:50::6ca2:c07c, 2a06:98c1:50::ac40:207c, 108.162.192.124, 172.64.32.124 and 173.245.58.124.

Mail Servers

theopencollege.com is handled by a single mail server, theopencollege-com.mail.protection.outlook.com.

Host theopencollege-com.mail.protection.outlook.com points to eight IP numbers: 2a01:111:f403:ca04::1, 2a01:111:f403:ca04::5, 2a01:111:f403:ca04::10, 2a01:111:f403:ca09::7, 52.101.68.3, 52.101.68.21, 52.101.73.28 and 52.101.73.30.

theopencollege.com - robtex.com