predict.courses - dns.ninja

`predict.courses`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::6815:2d03^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::ac43:cf09^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.45.3^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.207.9^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`harlee.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:26ee^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2ee^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`harlee.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22ee^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`harlee.ns.cloudflare.com`
		A	108.162.194.238^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
		A	162.159.38.238^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
		A	172.64.34.238^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
NS	`tosana.ns.cloudflare.com`
		A	2606:4700:58::a29f:2c2b^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tosana.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c32b^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`tosana.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:232b^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`tosana.ns.cloudflare.com`
		A	108.162.195.43^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tosana.ns.cloudflare.com`
		A	162.159.44.43^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tosana.ns.cloudflare.com`
		A	172.64.35.43^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tosana.ns.cloudflare.com`
MX	`route1.mx.cloudflare.net` ⭐
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
MX	`route2.mx.cloudflare.net`⁽⁷⁵⁾
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
MX	`route3.mx.cloudflare.net`⁽⁸⁴⁾
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
TXT	`v=spf1 include:_spf.mx.cloudflare.net ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.45.3, 172.67.207.9
		IPv6 hints	2606:4700:3032::6815:2d03, 2606:4700:3034::ac43:cf09
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=120, name=cloudflare-ech.com
SOA	`harlee.ns.cloudflare.com`dns@cloudflare.com serial=2402358747

`courses`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.nic.courses` ⭐
	NS	`b.nic.courses`
	NS	`c.nic.courses`
	NS	`x.nic.courses`
	NS	`y.nic.courses`
	NS	`z.nic.courses`
	SOA	`a.nic.courses`admin@tldns.godaddy serial=1781359018

⚠️ On DNS blocklist: tif

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DNS History

9 records (9 active, 0 former)

●NSharlee.ns.cloudflare.com2026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●NStosana.ns.cloudflare.com2026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●MXroute1.mx.cloudflare.net2026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●MXroute2.mx.cloudflare.net2026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●MXroute3.mx.cloudflare.net2026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●A104.21.45.32026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●A172.67.207.92026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●A2606:4700:3032::6815:2d032026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

●A2606:4700:3034::ac43:cf092026-03-19 → 2026-06-13 · 2 obs

● 2026-03-19 05:49:10
● 2026-06-13 14:42:02

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
courses	x.nic.courses, z.nic.courses, b.nic.courses, a.nic.courses...	12 records
predict.courses	harlee.ns.cloudflare.com, tosana.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.35.43

NS records: harlee.ns.cloudflare.com, tosana.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for predict.courses (unsigned zone)

⏱️ Timing

Total: 328ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.207.9, 104.21.45.3`
AAAA	2	`2606:4700:3034::ac43:cf09, 2606:4700:3032::6815:2d03`
NS	2	`harlee.ns.cloudflare.com, tosana.ns.cloudflare.com`
MX	3	`route1.mx.cloudflare.net (pri: 10), route2.mx.cloudflare.net (pri: 75)...`
TXT	1	`v=spf1 include:_spf.mx.cloudflare.net ~a`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`harlee.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (a.nic.courses, b.nic.courses, c.nic.courses...)

Analysis

IP Addresses

predict.courses points to four IP numbers: 104.21.45.3, 172.67.207.9, 2606:4700:3032::6815:2d03 and 2606:4700:3034::ac43:cf09.

dnstree.comwww.(0x736578)zoo.phpbb.net, elparigo.com, f5m305p.com plus two other host names have IP numbers in common with predict.courses.

Name Servers

DNS delegation for predict.courses points to two name servers: harlee.ns.cloudflare.com and tosana.ns.cloudflare.com.

The name server configuration of predict.courses is shared with other domains, for instance gezdimdurdumheveslendim.org, ssokkaldinaldinfrsaatt.org, 0x46.net and two others.

predict.courses partially shares its NS delegation with several other domains, including iain-takengon.ac.id, hostaldernes.es, mailmaster.lv and two others.

These name servers regularly co-occur with the name servers amanda.ns.cloudflare.com, terin.ns.cloudflare.com and paislee.ns.cloudflare.com.

Hosts with 6 IP addresses each:

harlee.ns.cloudflare.com has IP addresses 108.162.194.238, 162.159.38.238 and 172.64.34.238, plus 3 other.

tosana.ns.cloudflare.com has IP addresses 108.162.195.43, 162.159.44.43 and 172.64.35.43, plus 3 other.

Mail Servers

predict.courses uses three mail servers — route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

At least some of the mail servers used by predict.courses are shared with other domains: puzzlepicnic.com, mjsquared.net, halfdan.no and two others among them.

Hosts with 6 IP addresses each:

route1.mx.cloudflare.net has IP addresses 162.159.205.11, 162.159.205.12 and 162.159.205.13, plus 3 other.

route2.mx.cloudflare.net has IP addresses 162.159.205.17, 162.159.205.18 and 162.159.205.19, plus 3 other.

route3.mx.cloudflare.net has IP addresses 162.159.205.23, 162.159.205.24 and 162.159.205.25, plus 3 other.