mail.sefru.de - robtex.com

mail.sefru.de

DNSSEC⚠️ Not signed
A2a01:4f9:3a:224c::112:112🇩🇪 Hetzner2a01:4f9::/32 HETZNER-IPv6-BLK
PTRmail.sefru.de
A135.181.180.71🇫🇮 Hetzner135.181.0.0/16 HETZNER-DC
MXmail.sefru.de ⭐
A2a01:4f9:3a:224c::112:112🇩🇪 Hetzner2a01:4f9::/32 HETZNER-IPv6-BLK
PTRmail.sefru.de
A135.181.180.71🇫🇮 Hetzner135.181.0.0/16 HETZNER-DC
TXTv=spf1 mx ip4:135.181.180.71 ip6:2a01:4f9:3a:224c::112:112 -all

sefru.de

DNSSEC⚠️ Not signed
A2a01:4f9:3a:224c::112:112🇩🇪 Hetzner2a01:4f9::/32 HETZNER-IPv6-BLK
A135.181.180.71🇫🇮 Hetzner135.181.0.0/16 HETZNER-DC
NSns1.first-ns.de ⭐
NSrobotns2.second-ns.de
NSrobotns3.second-ns.com
MXmail.sefru.de ⭐
TXTgoogle-site-verification=mt40ExC6FbKXylxryafnpoMALmXZv8jXaCn85JPzAGs
TXTv=spf1 mx ip4:135.181.180.71 ip6:2a01:4f9:3a:224c::112:112 -all
SOAns1.first-ns.dednsadmin@sefru.de 2025-12-17 #19
🔒 HSTS Preload (+subdomains)

PTR for

2.1.1.0.2.1.1.0.0.0.0.0.0.0.0.0.c.4.2.2.a.3.0.0.9.f.4.0.1.0.a.2.ip6.arpa
71.180.181.135.in-addr.arpa

MX for

bxx5.de
sefru.com
mail.sefru.de
2342.de
linschmann.com
merkens.info
sefru.de
mail.sefru.com
der-comicshop.de

Same first word

mail.ky
mail.synology-diskstation.de
mail.schoolbus.jp
mail.uz.ua
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mail.mysecuritycamera.net
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mail.no-ip.info
mail.gob.cl
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mail.gov.cl
mail.srl
mail.org.nz
mail.chicappa.jp
mail.123hjemmeside.no
mail.fantasyleague.cc
mail.ufcfan.org
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DNS History

5 records (3 active, 2 former)

20162017201820192020202120222023202420252026MXmail.sefru.demail2.sefru.deA135.181.180.712a01:4f9:3a:224c::112:112188.40.78.46
●MXmail.sefru.de2026-02-15 → 2026-07-22 · 3 obs
○ 2016-04-15 21:27:56
● 2026-02-15 16:47:04
● 2026-07-22 03:38:54
○MXmail2.sefru.de2015-06-13 → 2016-04-15 · 4 obs
● 2015-06-13 09:55:08
● 2016-04-15 21:27:56
○ 2026-02-15 16:47:04
○ 2026-07-22 03:38:54
●A135.181.180.712026-02-15 → 2026-07-22 · 3 obs
○ 2016-04-15 21:27:56
● 2026-02-15 16:47:04
● 2026-07-22 03:38:54
○A188.40.78.462015-06-13 → 2016-04-15 · 4 obs
● 2015-06-13 09:55:08
● 2016-04-15 21:27:56
○ 2026-02-15 16:47:04
○ 2026-07-22 03:38:54
●A2a01:4f9:3a:224c::112:1122026-02-15 → 2026-07-22 · 3 obs
○ 2016-04-15 21:27:56
● 2026-02-15 16:47:04
● 2026-07-22 03:38:54

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
dea.nic.de, f.nic.de, z.nic.de-
sefru.derobotns3.second-ns.com, ns1.first-ns.de, robotns2.second-ns.de-

✅ Authoritative Response

Server:213.133.100.103

NS records: robotns3.second-ns.com, ns1.first-ns.de, robotns2.second-ns.de

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for sefru.de (unsigned zone)

⏱️ Timing

Total: 1253ms | Queries: -

📄 Records

TypeCountSample Data
A1135.181.180.71
AAAA12a01:4f9:3a:224c::112:112
MX1mail.sefru.de (pri: 10)
TXT1v=spf1 mx ip4:135.181.180.71 ip6:2a01:4f

Analysis

Mail Server Role

Mail for bxx5.de, sefru.com, mail.sefru.de, 2342.de, linschmann.com and a few other domains is routed through mail.sefru.de.

IP Addresses

mail.sefru.de resolves to the IP addresses 135.181.180.71 and 2a01:4f9:3a:224c::112:112

der-comicshop.de, bxx5.de, sefru.com and two other host names share IP numbers with mail.sefru.de.

Mail Servers

Mail for mail.sefru.de is handled by one mail server — mail.sefru.de.

mail.sefru.de uses an identical mail server configuration to several other domains — among them bxx5.de, sefru.com, 2342.de and two more.

The host mail.sefru.de resolves to 135.181.180.71 and 2a01:4f9:3a:224c::112:112 — two IP addresses.