www.course55.com - robtex.com

www.course55.com

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:5125🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3032::ac43:bc28🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.81.37Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.188.40🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.81.37, 172.67.188.40
IPv6 hints2606:4700:3030::6815:5125, 2606:4700:3032::ac43:bc28
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=17, name=cloudflare-ech.com

course55.com

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:5125🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3032::ac43:bc28🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.81.37Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.188.40🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdamon.ns.cloudflare.com ⭐
NSsasha.ns.cloudflare.com
MXaspmx.l.google.com ⭐
MXeforward1.registrar-servers.com(10)
MXeforward2.registrar-servers.com(10)
MXeforward3.registrar-servers.com(10)
MXeforward4.registrar-servers.com(15)
MXeforward5.registrar-servers.com(20)
TXTgoogle-site-verification=fPnRZrf3Fhpp9HwE14cXW3-ZY-ptZYX3SztQsH135f0
TXTgoogle._domainkey.course55.com
TXTv=spf1 include:_spf.google.com ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.81.37, 172.67.188.40
IPv6 hints2606:4700:3030::6815:5125, 2606:4700:3032::ac43:bc28
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=17, name=cloudflare-ech.com
SOAdamon.ns.cloudflare.comdns@cloudflare.com serial=2400449378

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DNS History

4 records (4 active, 0 former)

A104.21.81.37172.67.188.402606:4700:3030::6815:51252606:4700:3032::ac43:bc28
●A104.21.81.372026-03-27 → 2026-04-26 · 2 obs
● 2026-03-27 09:30:38
● 2026-04-26 22:32:56
●A172.67.188.402026-03-27 → 2026-04-26 · 2 obs
● 2026-03-27 09:30:38
● 2026-04-26 22:32:56
●A2606:4700:3030::6815:51252026-03-27 → 2026-04-26 · 2 obs
● 2026-03-27 09:30:38
● 2026-04-26 22:32:56
●A2606:4700:3032::ac43:bc282026-03-27 → 2026-04-26 · 2 obs
● 2026-03-27 09:30:38
● 2026-04-26 22:32:56

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
course55.comdamon.ns.cloudflare.com, sasha.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.194.69

NS records: damon.ns.cloudflare.com, sasha.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course55.com (unsigned zone)

⏱️ Timing

Total: 116ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.81.37, 172.67.188.40
AAAA22606:4700:3032::ac43:bc28, 2606:4700:3030::6815:5125
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

Four IP numbers are pointed to by www.course55.com: 2606:4700:3030::6815:5125, 2606:4700:3032::ac43:bc28, 104.21.81.37 and 172.67.188.40.

other host names including realestateagenthampstead39495.blogsidea.com, www.stmcathedral.com, karimjcdw527140.blogsidea.com, mesothelioma-va-disabilit47350.blogsidea.com and lagoinha.sp.gov.br share IP numbers with www.course55.com.