39428.courses.com - robtex.com
39428.courses.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:3030::6815:50fa🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3033::ac43:8856🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.80.250Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.136.86🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| TXT | v=spf1 -all | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.80.250, 172.67.136.86 | ||||||
| IPv6 hints | 2606:4700:3030::6815:50fa, 2606:4700:3033::ac43:8856 | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=109, name=cloudflare-ech.com | ||||||
courses.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:3030::6815:50fa🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3033::ac43:8856🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.80.250Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.136.86🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | clarissa.ns.cloudflare.com ⭐ | ||||||
| NS | colin.ns.cloudflare.com | ||||||
| MX | smtp.courses.com ⭐ | ||||||
| TXT | v=spf1 ip4:67.227.250.190 include:spf.ahasend.com -all | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.80.250, 172.67.136.86 | ||||||
| IPv6 hints | 2606:4700:3030::6815:50fa, 2606:4700:3033::ac43:8856 | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=109, name=cloudflare-ech.com | ||||||
| SOA | clarissa.ns.cloudflare.comdns@cloudflare.com serial=2400112479 | ||||||
Subdomains
pages.39428.courses.com |
Similar names
DNS History
4 records (4 active, 0 former)
●A104.21.80.2502026-04-26 → 2026-05-11 · 2 obs
● 2026-04-26 07:22:24
● 2026-05-11 12:18:20
● 2026-05-11 12:18:20
●A172.67.136.862026-04-26 → 2026-05-11 · 2 obs
● 2026-04-26 07:22:24
● 2026-05-11 12:18:20
● 2026-05-11 12:18:20
●A2606:4700:3030::6815:50fa2026-04-26 → 2026-05-11 · 2 obs
● 2026-04-26 07:22:24
● 2026-05-11 12:18:20
● 2026-05-11 12:18:20
●A2606:4700:3033::ac43:88562026-04-26 → 2026-05-11 · 2 obs
● 2026-04-26 07:22:24
● 2026-05-11 12:18:20
● 2026-05-11 12:18:20
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| courses.com | clarissa.ns.cloudflare.com, colin.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server:108.162.194.123
NS records: clarissa.ns.cloudflare.com, colin.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for courses.com (unsigned zone)
⏱️ Timing
Total: 138ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.21.80.250, 172.67.136.86 |
| AAAA | 2 | 2606:4700:3033::ac43:8856, 2606:4700:3030::6815:50fa |
| TXT | 1 | v=spf1 -all |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (clarissa.ns.cloudflare.com, clarissa.ns.cloudflare.com, clarissa.ns.cloudflare.com...)
Analysis
Hierarchy
39428.courses.com is a parent of pages.39428.courses.com.
IP Addresses
39428.courses.com points to four IP numbers: 2606:4700:3030::6815:50fa, 2606:4700:3033::ac43:8856, 104.21.80.250 and 172.67.136.86.
Other host names, for instance laligafutve.com, asfnlgna.icu, grupototal.com.br, www.zangereszondernaam.nl and medtrack.eu share IP numbers with 39428.courses.com.