courses.mastering.com - robtex.com

courses.mastering.com

DNSSEC⚠️ Not signed
A104.16.36.105Cloudflare104.16.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
A104.16.42.105Cloudflare104.16.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
A104.19.240.93Cloudflare104.19.240.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
A104.19.241.93Cloudflare104.19.240.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US

mastering.com

DNSSEC⚠️ Not signed
A2606:4700:20::681a:aef🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::681a:bef🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::ac43:4959🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.10.239Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.11.239Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.73.89🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSgina.ns.cloudflare.com ⭐
NSyichun.ns.cloudflare.com
MXaspmx.l.google.com ⭐
MXalt1.aspmx.l.google.com(5)
MXalt2.aspmx.l.google.com(5)
MXalt3.aspmx.l.google.com(10)
MXalt4.aspmx.l.google.com(10)
TXTclickfunnels-domain-verification=eWgQze
TXTfacebook-domain-verification=jhr3cdiy2hj7deeai1br4xwtsggn31
TXTgoogle-site-verification=4r4ggyLzo2fJ5DQAhUXuGjzACcMPdyweTm7fAwj01yo
TXTgoogle-site-verification=Rzgf5yCEdXEsagMHsyOG4188D7JdG16GzQ_tmbFvoyk
TXTgoogle-site-verification=iGmY3C2XwVOq1v5SVIwhCZIn_waqCOxvYfqw5eIZ5SM
TXTv=spf1 mx include:_spf.google.com ~all
HTTPSHTTP/2 ✓ hints match
IPv4 hints104.26.10.239, 104.26.11.239, 172.67.73.89
IPv6 hints2606:4700:20::681a:aef, 2606:4700:20::681a:bef, 2606:4700:20::ac43:4959
SOAgina.ns.cloudflare.comdns@cloudflare.com serial=2401628604
WOT: SAFE (65/100)
rank #337788 globally
rank #145131 in the tld
WOT: SAFE (87/100)
📈 Tranco rank: #546,722

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DNS History

4 records (4 active, 0 former)

A104.16.36.105104.16.42.105104.19.240.93104.19.241.93
●A104.16.36.1052026-04-16 → 2026-04-24 · 2 obs
● 2026-04-16 23:17:32
● 2026-04-24 02:56:14
●A104.16.42.1052026-04-16 → 2026-04-24 · 2 obs
● 2026-04-16 23:17:32
● 2026-04-24 02:56:14
●A104.19.240.932026-04-16 → 2026-04-24 · 2 obs
● 2026-04-16 23:17:32
● 2026-04-24 02:56:14
●A104.19.241.932026-04-16 → 2026-04-24 · 2 obs
● 2026-04-16 23:17:32
● 2026-04-24 02:56:14

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...-
mastering.comgina.ns.cloudflare.com, yichun.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.193.248

NS records: gina.ns.cloudflare.com, yichun.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mastering.com (unsigned zone)

⏱️ Timing

Total: 294ms | Queries: -

📄 Records

TypeCountSample Data
A4104.16.42.105, 104.19.241.93...

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

courses.mastering.com refers to four IP numbers: 104.16.36.105, 104.16.42.105, 104.19.240.93 and 104.19.241.93.

Other host names, for instance concordgov.com, tousabyte.com, sproutup.app, 0xglasses.com and affiliatecreatives.com share IP numbers with courses.mastering.com.