www.courses.com - robtex.com

www.courses.com

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:50fa🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3033::ac43:8856🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.80.250Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.136.86🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
TXTv=spf1 -all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.80.250, 172.67.136.86
IPv6 hints2606:4700:3030::6815:50fa, 2606:4700:3033::ac43:8856
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=83, name=cloudflare-ech.com

courses.com

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:50fa🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3033::ac43:8856🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.80.250Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.136.86🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSclarissa.ns.cloudflare.com ⭐
NScolin.ns.cloudflare.com
MXsmtp.courses.com ⭐
TXTv=spf1 ip4:67.227.250.190 include:spf.ahasend.com -all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.80.250, 172.67.136.86
IPv6 hints2606:4700:3030::6815:50fa, 2606:4700:3033::ac43:8856
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=83, name=cloudflare-ech.com
SOAclarissa.ns.cloudflare.comdns@cloudflare.com serial=2400112479

Same first word

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DNS History

11 records (4 active, 7 former)

20162017201820192020202120222023202420252026NSns51.domaincontrol.comns52.domaincontrol.comMXmailstore1.europe.secureserver.netsmtp.europe.secureserver.netA104.21.80.250172.67.136.862606:4700:3030::6815:50fa2606:4700:3033::ac43:8856209.59.184.1164.131.82.150CNAMEcourses.com
○NSns51.domaincontrol.com2017-02-09 → 2017-02-09 · 3 obs
● 2017-02-09 03:21:56
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18
○NSns52.domaincontrol.com2017-02-09 → 2017-02-09 · 3 obs
● 2017-02-09 03:21:56
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18
○MXmailstore1.europe.secureserver.net2017-02-09 → 2017-02-09 · 3 obs
● 2017-02-09 03:21:56
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18
○MXsmtp.europe.secureserver.net2017-02-09 → 2017-02-09 · 3 obs
● 2017-02-09 03:21:56
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18
●A104.21.80.2502026-04-30 → 2026-05-14 · 3 obs
○ 2017-02-09 03:21:56
● 2026-04-30 11:05:16
● 2026-05-14 04:27:18
●A172.67.136.862026-04-30 → 2026-05-14 · 3 obs
○ 2017-02-09 03:21:56
● 2026-04-30 11:05:16
● 2026-05-14 04:27:18
○A209.59.184.112026-04-30 → 2026-05-14 · 2 obs
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18
●A2606:4700:3030::6815:50fa2026-04-30 → 2026-05-14 · 3 obs
○ 2017-02-09 03:21:56
● 2026-04-30 11:05:16
● 2026-05-14 04:27:18
●A2606:4700:3033::ac43:88562026-04-30 → 2026-05-14 · 3 obs
○ 2017-02-09 03:21:56
● 2026-04-30 11:05:16
● 2026-05-14 04:27:18
○A64.131.82.1502015-06-11 → 2017-02-09 · 4 obs
● 2015-06-11 15:36:32
● 2017-02-09 03:21:56
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18
○CNAMEcourses.com2017-02-09 → 2017-02-09 · 3 obs
● 2017-02-09 03:21:56
○ 2026-04-30 11:05:16
○ 2026-05-14 04:27:18

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
courses.comclarissa.ns.cloudflare.com, colin.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.195.75

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: 199ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.136.86, 104.21.80.250
AAAA22606:4700:3033::ac43:8856, 2606:4700:3030::6815:50fa
TXT1v=spf1 -all
HTTPS1{"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

IP Addresses

Four IP numbers are pointed to by www.courses.com: 2606:4700:3030::6815:50fa, 2606:4700:3033::ac43:8856, 104.21.80.250 and 172.67.136.86.

other host names including vireloxentha.sbs, hailoosport.com, zamadrop.icu, 3t2fvgy4.465834.xyz and ksw-protect.pro share IP numbers with www.courses.com.