`distributed-runtime-lab.courses`

DNSSEC	⚠️ Not signed
A	104.21.13.227^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.133.92^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`tim.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b91^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tim.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c191^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`tim.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2191^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`tim.ns.cloudflare.com`
		A	108.162.193.145^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tim.ns.cloudflare.com`
		A	172.64.33.145^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tim.ns.cloudflare.com`
		A	173.245.59.145^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tim.ns.cloudflare.com`
NS	`zelda.ns.cloudflare.com`
		A	2606:4700:50::adf5:3af2^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zelda.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0f2^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`zelda.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20f2^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`zelda.ns.cloudflare.com`
		A	108.162.192.242^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zelda.ns.cloudflare.com`
		A	172.64.32.242^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zelda.ns.cloudflare.com`
		A	173.245.58.242^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zelda.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.13.227, 172.67.133.92
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=104, name=cloudflare-ech.com
SOA	`tim.ns.cloudflare.com`dns@cloudflare.com serial=2410914695

`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=1786541509

⚠️ On DNS blocklist: tif
⚠️ On DNS blocklist: spam-tlds

Subdomains

www.distributed-runtime-lab.courses

Same first word

distributed-runtime-lab.courses

DNS History

4 records (4 active, 0 former)

●NStim.ns.cloudflare.com2026-05-23 → 2026-08-12 · 2 obs

● 2026-05-23 10:58:36
● 2026-08-12 13:38:00

●NSzelda.ns.cloudflare.com2026-05-23 → 2026-08-12 · 2 obs

● 2026-05-23 10:58:36
● 2026-08-12 13:38:00

●A104.21.13.2272026-05-23 → 2026-08-12 · 2 obs

● 2026-05-23 10:58:36
● 2026-08-12 13:38:00

●A172.67.133.922026-05-23 → 2026-08-12 · 2 obs

● 2026-05-23 10:58:36
● 2026-08-12 13:38:00

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
courses	a.nic.courses, b.nic.courses, c.nic.courses, x.nic.courses...	12 records
distributed-runtime-lab.courses	tim.ns.cloudflare.com, zelda.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.242

NS records: tim.ns.cloudflare.com, zelda.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for distributed-runtime-lab.courses (unsigned zone)

⏱️ Timing

Total: 310ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.133.92, 104.21.13.227`
NS	2	`tim.ns.cloudflare.com, zelda.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`tim.ns.cloudflare.com dns.cloudflare.com`

📌 Glue Records Collected

Total: 12

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

Analysis

Hierarchy

distributed-runtime-lab.courses is the parent zone for www.distributed-runtime-lab.courses.

IP Addresses

distributed-runtime-lab.courses directs to two IP numbers, 104.21.13.227 and 172.67.133.92

Two other host names, along with associationrevenuepartners.net, ssncanada.ca and polvo.cn, also share IP numbers with distributed-runtime-lab.courses.

Name Servers

The NS records for distributed-runtime-lab.courses delegate to tim.ns.cloudflare.com and zelda.ns.cloudflare.com.

distributed-runtime-lab.courses shares its NS records with other domains, for example masterdevs.com, pdfcompressor-original.pages.dev, parasinvestment.com and two others.

distributed-runtime-lab.courses partially shares its NS delegation with several other domains, including fastml.net, searchmedications.com, betbox24.net and two others.

These name servers often co-occur with the name servers adrian.ns.cloudflare.com.

DNS names with 6 IP addresses:

tim.ns.cloudflare.com maps to 108.162.193.145, 172.64.33.145, 173.245.59.145 and 3 additional IP addresses.

zelda.ns.cloudflare.com maps to 108.162.192.242, 172.64.32.242, 173.245.58.242 and 3 additional IP addresses.

distributed-runtime-lab.courses - robtex.com