coursezero.com - dns.ninja

`coursezero.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:dc3a^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::6815:4e69^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.78.105^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.220.58^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`ram.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3be1^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ram.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1e1^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`ram.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21e1^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`ram.ns.cloudflare.com`
		A	108.162.193.225^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ram.ns.cloudflare.com`
		A	172.64.33.225^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ram.ns.cloudflare.com`
		A	173.245.59.225^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ram.ns.cloudflare.com`
NS	`stella.ns.cloudflare.com`
		A	2606:4700:50::a29f:269a^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`stella.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c29a^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`stella.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:229a^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`stella.ns.cloudflare.com`
		A	108.162.194.154^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`stella.ns.cloudflare.com`
		A	162.159.38.154^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`stella.ns.cloudflare.com`
		A	172.64.34.154^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`stella.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.78.105, 172.67.220.58
		IPv6 hints	2606:4700:3030::ac43:dc3a, 2606:4700:3035::6815:4e69
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=216, name=cloudflare-ech.com
SOA	`ram.ns.cloudflare.com`dns@cloudflare.com serial=2406552483

`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=1782766686

Same first word

coursezero.com

Similar names

sourcezero.com

sourcezero.co.uk

zerosource.com

DNS History

16 records (6 active, 10 former)

○NSns57.1and1.com2015-06-28 → 2017-09-02 · 4 obs

● 2015-06-28 17:39:50
● 2017-09-02 01:37:06
○ 2026-02-16 10:57:06
○ 2026-06-29 21:16:18

○NSns58.1and1.com2015-06-28 → 2017-09-02 · 4 obs

● 2015-06-28 17:39:50
● 2017-09-02 01:37:06
○ 2026-02-16 10:57:06
○ 2026-06-29 21:16:18

●NSram.ns.cloudflare.com2026-02-16 → 2026-06-29 · 3 obs

○ 2017-09-02 01:37:06
● 2026-02-16 10:57:06
● 2026-06-29 21:16:18

●NSstella.ns.cloudflare.com2026-02-16 → 2026-06-29 · 3 obs

○ 2017-09-02 01:37:06
● 2026-02-16 10:57:06
● 2026-06-29 21:16:18

○MXmailstore1.secureserver.net2015-06-28 → 2026-02-16 · 4 obs

● 2015-06-28 17:39:50
● 2026-02-16 11:42:30
○ 2026-02-19 18:20:46
○ 2026-06-29 21:16:18

○MXsmtp.secureserver.net2015-06-28 → 2026-02-16 · 4 obs

● 2015-06-28 17:39:50
● 2026-02-16 11:42:30
○ 2026-02-19 18:20:46
○ 2026-06-29 21:16:18

●A104.21.78.1052026-02-16 → 2026-06-29 · 24 obs

○ 2017-09-02 01:37:06
● 2026-02-16 10:57:06
● 2026-03-23 12:57:30
○ 2026-03-24 04:18:02
● 2026-03-24 12:55:42
● 2026-03-26 18:09:26
○ 2026-03-28 21:54:26
● 2026-04-03 04:56:14
● 2026-04-11 22:31:50
○ 2026-04-14 00:51:22
● 2026-04-15 19:11:22
● 2026-04-28 02:10:10
○ 2026-05-14 00:39:16
○ 2026-05-20 02:35:48
● 2026-05-20 23:57:50
● 2026-05-30 00:12:48
○ 2026-05-30 20:44:50
● 2026-06-04 17:10:36
○ 2026-06-09 12:23:30
● 2026-06-12 21:00:56
● 2026-06-16 05:46:30
○ 2026-06-20 09:49:38
● 2026-06-29 12:25:24
● 2026-06-29 21:16:18

●A172.67.220.582026-02-16 → 2026-06-29 · 24 obs

○A188.114.96.02026-03-24 → 2026-06-20 · 22 obs

○ 2026-03-23 12:57:30
● 2026-03-24 04:18:02
○ 2026-03-24 12:55:42
○ 2026-03-26 18:09:26
● 2026-03-28 21:54:26
○ 2026-04-03 04:56:14
○ 2026-04-11 22:31:50
● 2026-04-14 00:51:22
○ 2026-04-15 19:11:22
○ 2026-04-28 02:10:10
● 2026-05-14 00:39:16
● 2026-05-20 02:35:48
○ 2026-05-20 23:57:50
○ 2026-05-30 00:12:48
● 2026-05-30 20:44:50
○ 2026-06-04 17:10:36
● 2026-06-09 12:23:30
○ 2026-06-12 21:00:56
○ 2026-06-16 05:46:30
● 2026-06-20 09:49:38
○ 2026-06-29 12:25:24
○ 2026-06-29 21:16:18

○A188.114.97.02026-03-24 → 2026-06-20 · 22 obs

○A216.250.120.1472016-07-03 → 2017-09-02 · 5 obs

○ 2016-03-07 00:29:42
● 2016-07-03 01:22:02
● 2017-09-02 01:37:06
○ 2026-02-16 10:57:06
○ 2026-06-29 21:16:18

●A2606:4700:3030::ac43:dc3a2026-02-16 → 2026-06-29 · 24 obs

●A2606:4700:3035::6815:4e692026-02-16 → 2026-06-29 · 24 obs

○A2a06:98c1:3120::2026-03-24 → 2026-06-20 · 22 obs

○A2a06:98c1:3121::2026-03-24 → 2026-06-20 · 22 obs

○A74.208.135.1492015-06-28 → 2016-03-07 · 4 obs

● 2015-06-28 17:39:50
● 2016-03-07 00:29:42
○ 2016-07-03 01:22:02
○ 2026-06-29 21:16:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, i.gtld-servers.net, e.gtld-servers.net, m.gtld-servers.net...	-
coursezero.com	ram.ns.cloudflare.com, stella.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.225

NS records: ram.ns.cloudflare.com, stella.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for coursezero.com (unsigned zone)

⏱️ Timing

Total: 256ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.78.105, 172.67.220.58`
AAAA	2	`2606:4700:3035::6815:4e69, 2606:4700:3030::ac43:dc3a`
NS	2	`ram.ns.cloudflare.com, stella.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`ram.ns.cloudflare.com dns.cloudflare.com`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

coursezero.com points to the four IP addresses 104.21.78.105, 172.67.220.58, 2606:4700:3030::ac43:dc3a and 2606:4700:3035::6815:4e69.

taylorvowell.com, n188.cheap, atcc.fr plus two other host names have IP numbers in common with coursezero.com.

Name Servers

coursezero.com uses two name servers for its delegation: ram.ns.cloudflare.com and stella.ns.cloudflare.com.

The name server configuration of coursezero.com is shared with other domains, for instance holte.nu, baustoffmarktgruppe.de, pob.cl and two others.

There is at least partial name server overlap between coursezero.com and other domains — lancasterco.com, mapmyfitnessinc.com, timetoroam.com.au and two more among them.

These name servers frequently co-occur with the name servers john.ns.cloudflare.com and rene.ns.cloudflare.com.

Hosts with 6 IP addresses each:

Hostname ram.ns.cloudflare.com directs to 108.162.193.225, 172.64.33.225 and 173.245.59.225 along with 3 other IP addresses.

Hostname stella.ns.cloudflare.com directs to 108.162.194.154, 162.159.38.154 and 172.64.34.154 along with 3 other IP addresses.