mail.dubs.nu - robtex.com

mail.dubs.nu

DNSSEC⚠️ Not signed
A2606:4700:3032::ac43:d15b🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::6815:4593🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.69.147Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.209.91🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.69.147, 172.67.209.91
IPv6 hints2606:4700:3032::ac43:d15b, 2606:4700:3036::6815:4593
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=24, name=cloudflare-ech.com

dubs.nu

DNSSEC⚠️ Not signed
A2606:4700:3032::ac43:d15b🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::6815:4593🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.69.147Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.209.91🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSchristian.ns.cloudflare.com ⭐
NSdell.ns.cloudflare.com
MXmail.dubs.nu ⭐
TXTv=spf1 a mx include:spf.inleed.se ip4:185.189.49.214 ip6:2a0b:dc80:cafe:101::...
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.69.147, 172.67.209.91
IPv6 hints2606:4700:3032::ac43:d15b, 2606:4700:3036::6815:4593
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=23, name=cloudflare-ech.com
SOAchristian.ns.cloudflare.comdns@cloudflare.com serial=2407193152

MX for

dubs.nu

Same first word

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DNS History

5 records (4 active, 1 former)

A104.21.69.147172.67.209.912606:4700:3032::ac43:d15b2606:4700:3036::6815:459346.59.102.198
●A104.21.69.1472026-07-16 → 2026-07-21 · 3 obs
○ 2026-04-19 08:25:44
● 2026-07-16 01:34:42
● 2026-07-21 08:11:12
●A172.67.209.912026-07-16 → 2026-07-21 · 3 obs
○ 2026-04-19 08:25:44
● 2026-07-16 01:34:42
● 2026-07-21 08:11:12
●A2606:4700:3032::ac43:d15b2026-07-16 → 2026-07-21 · 3 obs
○ 2026-04-19 08:25:44
● 2026-07-16 01:34:42
● 2026-07-21 08:11:12
●A2606:4700:3036::6815:45932026-07-16 → 2026-07-21 · 3 obs
○ 2026-04-19 08:25:44
● 2026-07-16 01:34:42
● 2026-07-21 08:11:12
○A46.59.102.1982026-03-14 → 2026-04-19 · 4 obs
● 2026-03-14 11:33:10
● 2026-04-19 08:25:44
○ 2026-07-16 01:34:42
○ 2026-07-21 08:11:12

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
nua.ns.nu, z.ns.nu, d.ns.nu, m.ns.nu...12 records
dubs.nudell.ns.cloudflare.com, christian.ns.cloudflare.com-

✅ Authoritative Response

Server:172.64.32.94

NS records: dell.ns.cloudflare.com, christian.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for dubs.nu (unsigned zone)

⏱️ Timing

Total: 2391ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.69.147, 172.67.209.91
AAAA22606:4700:3032::ac43:d15b, 2606:4700:3036::6815:4593
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (z.ns.nu, y.ns.nu, m.ns.nu...)

Analysis

Mail Server Role

mail.dubs.nu is a mail server for dubs.nu.

IP Addresses

mail.dubs.nu has four IP addresses: 104.21.69.147, 172.67.209.91, 2606:4700:3032::ac43:d15b and 2606:4700:3036::6815:4593.

Among the host names that share IP numbers with mail.dubs.nu are calixpressinc.com, mx7.action37.com, agga.cc and two others.