smtp.courses.com - robtex.com

smtp.courses.com

DNSSEC⚠️ Not signed
A209.59.184.11🇺🇸 LiquidWeb209.59.128.0/18 Liquid Web Inc 4210 S. Creyts Rd Lansing, MI 48917
PTRcloudvpsserver.hinesh.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=222, name=cloudflare-ech.com
SOAclarissa.ns.cloudflare.comdns@cloudflare.com serial=2400112479

MX for

courses.com

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DNS History

1 record (1 active, 0 former)

A209.59.184.11
●A209.59.184.112026-02-14 → 2026-05-11 · 2 obs
● 2026-02-14 16:50:58
● 2026-05-11 14:25:50

🔍 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:108.162.194.123

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: 509ms | Queries: -

📄 Records

TypeCountSample Data
A1209.59.184.11

📌 Glue Records Collected

Total: 12

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

Analysis

Mail Server Role

smtp.courses.com is the mail server for courses.com.

IP Addresses

smtp.courses.com points to a single IP number: 209.59.184.11.