mail.libcourse.com - dns.ninja

mail.libcourse.com

DNSSEC⚠️ Not signed
A2606:4700:3033::ac43:bf50🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::6815:b3b🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.11.59Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.191.80🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.11.59, 172.67.191.80
IPv6 hints2606:4700:3033::ac43:bf50, 2606:4700:3036::6815:b3b
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=85, name=cloudflare-ech.com

libcourse.com

DNSSEC⚠️ Not signed
A2606:4700:3033::ac43:bf50🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::6815:b3b🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.11.59Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.191.80🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSali.ns.cloudflare.com ⭐
NSdamiete.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.11.59, 172.67.191.80
IPv6 hints2606:4700:3033::ac43:bf50, 2606:4700:3036::6815:b3b
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=85, name=cloudflare-ech.com
SOAali.ns.cloudflare.comdns@cloudflare.com serial=2409419066
⚠️ On DNS blocklist: tif

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DNS History

8 records (4 active, 4 former)

A104.21.11.59172.67.191.802606:4700:3033::ac43:bf502606:4700:3036::6815:b3b188.114.96.4188.114.97.42a06:98c1:3120::42a06:98c1:3121::4
●A104.21.11.592026-07-31 → 2026-07-31 · 2 obs
○ 2026-07-27 11:13:30
● 2026-07-31 15:25:58
●A172.67.191.802026-07-31 → 2026-07-31 · 2 obs
○ 2026-07-27 11:13:30
● 2026-07-31 15:25:58
○A188.114.96.42026-07-27 → 2026-07-27 · 2 obs
● 2026-07-27 11:13:30
○ 2026-07-31 15:25:58
○A188.114.97.42026-07-27 → 2026-07-27 · 2 obs
● 2026-07-27 11:13:30
○ 2026-07-31 15:25:58
●A2606:4700:3033::ac43:bf502026-07-31 → 2026-07-31 · 2 obs
○ 2026-07-27 11:13:30
● 2026-07-31 15:25:58
●A2606:4700:3036::6815:b3b2026-07-31 → 2026-07-31 · 2 obs
○ 2026-07-27 11:13:30
● 2026-07-31 15:25:58
○A2a06:98c1:3120::42026-07-27 → 2026-07-27 · 2 obs
● 2026-07-27 11:13:30
○ 2026-07-31 15:25:58
○A2a06:98c1:3121::42026-07-27 → 2026-07-27 · 2 obs
● 2026-07-27 11:13:30
○ 2026-07-31 15:25:58

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
come.gtld-servers.net, b.gtld-servers.net, l.gtld-servers.net, j.gtld-servers.net...-
libcourse.comali.ns.cloudflare.com, damiete.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.192.59

NS records: ali.ns.cloudflare.com, damiete.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for libcourse.com (unsigned zone)

⏱️ Timing

Total: 134ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.191.80, 104.21.11.59
AAAA22606:4700:3033::ac43:bf50, 2606:4700:3036::6815:b3b
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (ali.ns.cloudflare.com, ali.ns.cloudflare.com, ali.ns.cloudflare.com...)

Analysis

IP Addresses

mail.libcourse.com directs to four IP numbers, which are 104.21.11.59, 172.67.191.80, 2606:4700:3033::ac43:bf50 and 2606:4700:3036::6815:b3b.

mypetworldstore.com, www.cavetools.com, bellalivenet.com and two other host names share IP numbers with mail.libcourse.com.