mail.duobitu.com - robtex.com

mail.duobitu.com

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:2bc2🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::ac43:b8aa🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.43.194Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.184.170🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.43.194, 172.67.184.170
IPv6 hints2606:4700:3033::6815:2bc2, 2606:4700:3036::ac43:b8aa
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=251, name=cloudflare-ech.com

duobitu.com

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:2bc2🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::ac43:b8aa🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.43.194Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.184.170🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSgabe.ns.cloudflare.com ⭐
NSjill.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.43.194, 172.67.184.170
IPv6 hints2606:4700:3033::6815:2bc2, 2606:4700:3036::ac43:b8aa
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=251, name=cloudflare-ech.com
SOAgabe.ns.cloudflare.comdns@cloudflare.com serial=2409532549

Previously MX for

duobitu.com

Same first word

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DNS History

5 records (4 active, 1 former)

200920112013201520172019202120232025A104.21.43.194172.67.184.1702606:4700:3033::6815:2bc22606:4700:3036::ac43:b8aa210.51.169.13
●A104.21.43.1942026-08-14 → 2026-08-14 · 3 obs
○ 2016-05-14 19:10:12
● 2026-08-14 05:23:32
● 2026-08-14 05:23:34
●A172.67.184.1702026-08-14 → 2026-08-14 · 3 obs
○ 2016-05-14 19:10:12
● 2026-08-14 05:23:32
● 2026-08-14 05:23:34
○A210.51.169.132008-03-09 → 2016-05-14 · 4 obs
● 2008-03-09 23:16:56
● 2016-05-14 19:10:12
○ 2026-08-14 05:23:32
○ 2026-08-14 05:23:34
●A2606:4700:3033::6815:2bc22026-08-14 → 2026-08-14 · 3 obs
○ 2016-05-14 19:10:12
● 2026-08-14 05:23:32
● 2026-08-14 05:23:34
●A2606:4700:3036::ac43:b8aa2026-08-14 → 2026-08-14 · 3 obs
○ 2016-05-14 19:10:12
● 2026-08-14 05:23:32
● 2026-08-14 05:23:34

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comg.gtld-servers.net, b.gtld-servers.net, h.gtld-servers.net, j.gtld-servers.net...-
duobitu.comgabe.ns.cloudflare.com, jill.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.192.122

NS records: gabe.ns.cloudflare.com, jill.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for duobitu.com (unsigned zone)

⏱️ Timing

Total: 351ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.184.170, 104.21.43.194
AAAA22606:4700:3036::ac43:b8aa, 2606:4700:3033::6815:2bc2
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

mail.duobitu.com has four IP addresses: 104.21.43.194, 172.67.184.170, 2606:4700:3033::6815:2bc2 and 2606:4700:3036::ac43:b8aa.

www.30sw.cc, linggro.com, barge2rail.com plus two other host names have IP numbers in common with mail.duobitu.com.