hack.courses - dns.ninja

`hack.courses`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::6815:825^{Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::ac43:9cc5^{Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.8.37^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.156.197^{Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`alexis.ns.cloudflare.com` ⭐
NS	`gene.ns.cloudflare.com`
TXT	`1\|www.hack.courses`
TXT	`v=spf1 include:mx.ovh.com ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.8.37, 172.67.156.197
		IPv6 hints	2606:4700:3031::6815:825, 2606:4700:3035::ac43:9cc5
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=14, name=cloudflare-ech.com
SOA	`alexis.ns.cloudflare.com`dns@cloudflare.com serial=2405974001

`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=1780581499

DNS History

10 records (6 active, 4 former)

●NSalexis.ns.cloudflare.com2026-02-16 → 2026-06-04 · 2 obs

● 2026-02-16 11:20:06
● 2026-06-04 15:17:30

●NSgene.ns.cloudflare.com2026-02-16 → 2026-06-04 · 2 obs

● 2026-02-16 11:20:06
● 2026-06-04 15:17:30

●A104.21.8.372026-02-16 → 2026-06-04 · 12 obs

● 2026-02-16 11:20:06
● 2026-02-25 19:05:20
○ 2026-03-11 08:11:18
● 2026-03-11 12:34:48
● 2026-03-16 01:21:04
○ 2026-03-26 06:00:38
● 2026-03-26 11:26:08
● 2026-05-08 00:55:40
○ 2026-05-12 00:35:42
○ 2026-05-27 15:25:24
● 2026-05-29 14:59:26
● 2026-06-04 15:17:30

●A172.67.156.1972026-02-16 → 2026-06-04 · 12 obs

○A188.114.96.02026-03-11 → 2026-05-27 · 11 obs

○ 2026-02-25 19:05:20
● 2026-03-11 08:11:18
○ 2026-03-11 12:34:48
○ 2026-03-16 01:21:04
● 2026-03-26 06:00:38
○ 2026-03-26 11:26:08
○ 2026-05-08 00:55:40
● 2026-05-12 00:35:42
● 2026-05-27 15:25:24
○ 2026-05-29 14:59:26
○ 2026-06-04 15:17:30

○A188.114.97.02026-03-11 → 2026-05-27 · 11 obs

●A2606:4700:3031::6815:8252026-02-16 → 2026-06-04 · 12 obs

●A2606:4700:3035::ac43:9cc52026-02-16 → 2026-06-04 · 12 obs

○A2a06:98c1:3120::2026-03-11 → 2026-05-27 · 11 obs

○A2a06:98c1:3121::2026-03-11 → 2026-05-27 · 11 obs

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
courses	a.nic.courses, b.nic.courses, c.nic.courses, x.nic.courses...	12 records
hack.courses	gene.ns.cloudflare.com, alexis.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.158

NS records: gene.ns.cloudflare.com, alexis.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for hack.courses (unsigned zone)

⏱️ Timing

Total: 4621ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.8.37, 172.67.156.197`
AAAA	2	`2606:4700:3035::ac43:9cc5, 2606:4700:3031::6815:825`
NS	2	`alexis.ns.cloudflare.com, gene.ns.cloudflare.com`
TXT	2	`1\|www.hack.courses, v=spf1 include:mx.ovh.com ~all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`alexis.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

hack.courses has 4 IP addresses: 104.21.8.37, 172.67.156.197, 2606:4700:3031::6815:825 and 2606:4700:3035::ac43:9cc5.

Name Servers

hack.courses is delegated to two name servers: alexis.ns.cloudflare.com and gene.ns.cloudflare.com.