mail.subsystem.nl - robtex.com

mail.subsystem.nl

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:4ea8🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3037::ac43:8803🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.78.168Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.136.3🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.78.168, 172.67.136.3
IPv6 hints2606:4700:3033::6815:4ea8, 2606:4700:3037::ac43:8803
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=223, name=cloudflare-ech.com

subsystem.nl

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:4ea8🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3037::ac43:8803🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.78.168Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.136.3🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSjasper.ns.cloudflare.com ⭐
NSnoor.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.78.168, 172.67.136.3
IPv6 hints2606:4700:3033::6815:4ea8, 2606:4700:3037::ac43:8803
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=223, name=cloudflare-ech.com
SOAjasper.ns.cloudflare.comdns@cloudflare.com serial=2400649126

Previously MX for

subsystem.nl

Same first word

mail.gouv.ci
mail.gi
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mail.k12.vt.us
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DNS History

6 records (4 active, 2 former)

20162017201820192020202120222023202420252026A104.21.78.168172.67.136.32606:4700:3033::6815:4ea82606:4700:3037::ac43:88032a00:f10:11a:56e::131.25.101.111
●A104.21.78.1682026-03-14 → 2026-04-11 · 3 obs
○ 2016-04-08 08:09:00
● 2026-03-14 03:06:40
● 2026-04-11 17:40:16
●A172.67.136.32026-03-14 → 2026-04-11 · 3 obs
○ 2016-04-08 08:09:00
● 2026-03-14 03:06:40
● 2026-04-11 17:40:16
●A2606:4700:3033::6815:4ea82026-03-14 → 2026-04-11 · 3 obs
○ 2016-04-08 08:09:00
● 2026-03-14 03:06:40
● 2026-04-11 17:40:16
●A2606:4700:3037::ac43:88032026-03-14 → 2026-04-11 · 3 obs
○ 2016-04-08 08:09:00
● 2026-03-14 03:06:40
● 2026-04-11 17:40:16
○A2a00:f10:11a:56e::12015-06-09 → 2016-04-08 · 4 obs
● 2015-06-09 01:02:06
● 2016-04-08 08:09:00
○ 2026-03-14 03:06:40
○ 2026-04-11 17:40:16
○A31.25.101.1112015-06-09 → 2016-04-08 · 4 obs
● 2015-06-09 01:02:06
● 2016-04-08 08:09:00
○ 2026-03-14 03:06:40
○ 2026-04-11 17:40:16

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
nlns1.dns.nl, ns3.dns.nl, ns4.dns.nl-
subsystem.nlnoor.ns.cloudflare.com, jasper.ns.cloudflare.com-

✅ Authoritative Response

Server:172.64.34.74

NS records: noor.ns.cloudflare.com, jasper.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for subsystem.nl (unsigned zone)

⏱️ Timing

Total: 242ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.78.168, 172.67.136.3
AAAA22606:4700:3033::6815:4ea8, 2606:4700:3037::ac43:8803
HTTPS1{"priority":1,"target":".","alpn":["h3",

Analysis

IP Addresses

mail.subsystem.nl points to four IP numbers: 2606:4700:3033::6815:4ea8, 2606:4700:3037::ac43:8803, 104.21.78.168 and 172.67.136.3.

For instance, other host names pk9678.com, eremit2.ro, piass.ac.rw, insiderecent.com and iflorist.co.uk share IP numbers with mail.subsystem.nl.