class4.de - dns.ninja

class4.de

DNSSEC⚠️ Not signed
A81.90.33.57🇩🇪 CMO-AS81.90.32.0/20 CMO Internet Dienstleistungen GmbH via Globalways
PTRidefix6.rt.cmo.de
NSns6.cmo.de ⭐
A2001:4ce0:0:2::2f🇩🇪 CMO-AS2001:4ce0::/32 CMO IPv6 Connectivity
PTRns6.cmo.de
A81.90.33.17🇩🇪 CMO-AS81.90.32.0/20 CMO Internet Dienstleistungen GmbH via Globalways
PTRns6.cmo.de
NSns7.cmo.de
A2a07:6d40:1:2::66🇳🇱 SkyLink2a07:6d40::/29
A185.150.26.66🇳🇱 SkyLink185.150.26.0/24
MXmx0.rt.cmo.de ⭐
A2001:4ce0:0:2::34🇩🇪 CMO-AS2001:4ce0::/32 CMO IPv6 Connectivity
PTRsmtp5.rt.cmo.de
A81.90.33.50🇩🇪 CMO-AS81.90.32.0/20 CMO Internet Dienstleistungen GmbH via Globalways
PTRsmtp5.rt.cmo.de
MXmx1.rt.cmo.de ⭐
A2001:4ce0:0:2::34🇩🇪 CMO-AS2001:4ce0::/32 CMO IPv6 Connectivity
PTRsmtp5.rt.cmo.de
A81.90.33.50🇩🇪 CMO-AS81.90.32.0/20 CMO Internet Dienstleistungen GmbH via Globalways
PTRsmtp5.rt.cmo.de
TXTv=spf1 ip4:81.90.33.0/24 ip6:2001:4ce0:0:2::/64 ~all
SOAns6.cmo.desommer@cmo.de 2019-09-06 #14

de

DNSSEC🔒 Signed (DS record present)
NSf.nic.de ⭐
NSa.nic.de
NSl.de.net ⚠️ Not in parent delegation
NSn.de.net ⚠️ Not in parent delegation
NSs.de.net ⚠️ Not in parent delegation
NSz.nic.de
SOAf.nic.dedns-operations@denic.de serial=1786711296

Subdomains

smtp.class4.de
imap.class4.de

Same first word

class4.de
class4.us
class4.com

Similar names

4class.com

DNS History

8 records (5 active, 3 former)

20162017201820192020202120222023202420252026NSns6.cmo.dens7.cmo.dens4.cmo.dens5.cmo.deMXmx0.rt.cmo.demx1.rt.cmo.deA81.90.33.5781.90.33.30
○NSns4.cmo.de2015-05-13 → 2016-07-03 · 4 obs
● 2015-05-13 12:36:24
● 2016-07-03 02:50:52
○ 2026-02-15 05:27:30
○ 2026-08-14 12:52:52
○NSns5.cmo.de2015-05-13 → 2016-07-03 · 4 obs
● 2015-05-13 12:36:24
● 2016-07-03 02:50:52
○ 2026-02-15 05:27:30
○ 2026-08-14 12:52:52
●NSns6.cmo.de2026-02-15 → 2026-08-14 · 3 obs
○ 2016-07-03 02:50:52
● 2026-02-15 05:27:30
● 2026-08-14 12:52:52
●NSns7.cmo.de2026-02-15 → 2026-08-14 · 3 obs
○ 2016-07-03 02:50:52
● 2026-02-15 05:27:30
● 2026-08-14 12:52:52
●MXmx0.rt.cmo.de2015-05-13 → 2026-08-14 · 2 obs
● 2015-05-13 12:36:24
● 2026-08-14 12:52:52
●MXmx1.rt.cmo.de2015-05-13 → 2026-08-14 · 2 obs
● 2015-05-13 12:36:24
● 2026-08-14 12:52:52
○A81.90.33.302015-05-13 → 2016-07-03 · 4 obs
● 2015-05-13 12:36:24
● 2016-07-03 02:50:52
○ 2026-02-15 05:27:30
○ 2026-08-14 12:52:52
●A81.90.33.572026-02-15 → 2026-08-14 · 3 obs
○ 2016-07-03 02:50:52
● 2026-02-15 05:27:30
● 2026-08-14 12:52:52

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
dez.nic.de, a.nic.de, f.nic.de-
class4.dens6.cmo.de, ns7.cmo.de-

✅ Authoritative Response

Server:81.90.33.17

NS records: ns6.cmo.de, ns7.cmo.de

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for class4.de (unsigned zone)

⏱️ Timing

Total: 1483ms | Queries: -

📄 Records

TypeCountSample Data
A181.90.33.57
NS2ns6.cmo.de, ns7.cmo.de
MX2mx0.rt.cmo.de (pri: 10), mx1.rt.cmo.de (pri: 10)
TXT1v=spf1 ip4:81.90.33.0/24 ip6:2001:4ce0:0
SOA1ns6.cmo.de sommer.cmo.de

Analysis

Hierarchy

The parent domain of smtp.class4.de and imap.class4.de is class4.de.

IP Addresses

class4.de directs to one IP number, which is 81.90.33.57.

Among the host names that share IP numbers with class4.de are erbuhb.de, led-shop24.de, mail.stohl.de and two others.

Name Servers

class4.de is served by two delegated name servers, ns6.cmo.de and ns7.cmo.de.

class4.de has the same name server delegation as a number of other domains, such as gourmetfactory.de, topzelt.de, beocca.de and two more.

Each of the two host names carries two IP addresses: ns6.cmo.de points to 81.90.33.17 and 2001:4ce0:0:2::2f, and ns7.cmo.de points to 185.150.26.66 and 2a07:6d40:1:2::66.

Mail Servers

The MX records for class4.de point to two mail servers: mx0.rt.cmo.de and mx1.rt.cmo.de.

class4.de has the same mail server arrangement as a number of other domains, for example spqd.de, whackywit.com, udobenz.de and two more.

class4.de shares at least some of its mail servers with other domains — for example vr-bank-ermstal-alb.com, volksbank-ermstal-alb.com, vrbank-ermstal-alb.com and two more.

These mail servers frequently appear alongside the mail servers cluster8.eu.messagelabs.com and cluster8a.eu.messagelabs.com.

The host names mx0.rt.cmo.de and mx1.rt.cmo.de both direct to 81.90.33.50 and 2001:4ce0:0:2::34.

These two host names — mx0.rt.cmo.de and mx1.rt.cmo.de — each point to 2001:4ce0:0:2::34 IP addresses.

These two host names — mx0.rt.cmo.de and mx1.rt.cmo.de — each point to 81.90.33.50 IP addresses.