c21.nl - robtex.com

c21.nl

DNSSEC🔒 Signed (DS record present)
A2a01:238:20a:202:1092::🇩🇪 STRATO2a01:238:20a::/48 Strato AG
PTRw8c.rzone.de
A81.169.145.92🇩🇪 STRATO81.169.144.0/22 AG
NSdocks14.rzone.de ⭐
A2001:8d8:fe:53:5747:2a74:d:14🇩🇪 IONOS-AS2001:8d8:fe::/47 IONOS AS8560 anycast more specific
PTRdocks14.rzone.de
A217.160.80.141🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific
PTRdocks14.rzone.de
NSshades03.rzone.de
A2607:f1c0:fe:53:185:132:34:130🇺🇸 IONOS-ANYCAST2607:f1c0:fe::/47 AS8560 global anycast services (more specific) 1&1 IONOS Inc. 701 Lee Rd, Suite 300 Chesterbrook, PA 19087 US
PTRshades03.rzone.de
A185.132.34.130🇩🇪 IONOS-ANYCAST185.132.32.0/22 IONOS DNSAS (eBGP DNS)
PTRshades03.rzone.de
MXsmtp.rzone.de ⭐
A2a01:238:20a:202:50f0::2097🇩🇪 STRATO2a01:238:20a::/48 Strato AG
PTRsmtp.rzone.de
A81.169.145.98🇩🇪 STRATO81.169.144.0/22 AG
PTRsmtp.rzone.de
SOAdocks14.rzone.dehostmaster@strato-rz.de 2020-07-01 #27

nl

DNSSEC🔒 Signed (DS record present)
NSns1.dns.nl ⭐
NSns3.dns.nl
NSns4.dns.nl
TXTnl zone update: 2026-04-13 14:00:01 +0000 (EPOCH 1776088801)
SOAns1.dns.nldns@sidn.nl 2026-04-13 #27

Subdomains

mx20.c21.nl

Same first word

c21.it
c21.com.hk
c21.si
c21.at
c21.ir
c21.online
c21.mx
c21.cn
c21.name
c21.ca
c21.gr
c21.sk
c21.eu
c21.hk
c21.fr
c21.us
c21.dk
c21.nl
c21.xyz
c21.net.cn
c21.com.tr
c21.ro
c21.ae
c21.tech
c21.homes
c21.al
c21.co
c21.hr
c21.com.br
c21.pe
c21.com.vn
c21.com.cn
c21.to
c21.site
c21.gy
c21.pl
c21.be
c21.properties
c21.azureedge.net
c21.com
c21.cz
c21.bz
c21.net
c21.nyc
c21.vn
c21.com.bo
c21.info
c21.tv
c21.ru
c21.biz

Similar names

21c.xin
c12.fr
c12.dk
2c1.fr
21c.cn
21c.me
21c.ru
1c2.me
21c.co.jp
1c2.com.cn
c12.com
c12.kr
c12.nl
21c.it
1c2.net
12c.in
12c.nl
12c.co.uk
12c.eu
c12.com.br
2c1.com
c12.tv
2c1.net
c12.ca
21c.com
1c2.fr
12c.org
21c.org
12c.cn
12c.io
21c.jp
12c.com.cn
c12.ru
21c.community
21c.biz
21c.or.jp
1c2.com
2c1.cz
12c.de
c12.de
12c.us
c12.us
21c.tc
c12.org
c12.pw
12c.cz
c12.cz
21c.ca
21c.online
21c.pl
1c2.eu
c12.pl
21c.de
c12.cn
12c.no
21c.email
21c.co.uk
1c2.mobi
1c2.de
2c1.de
c12.com.au
c12.me
21c.co.in
12c.com
12c.me
c12.it
21c.or.kr
21c.nl
21c.us
c12.in

DNS History

13 records (5 active, 8 former)

20162017201820192020202120222023202420252026NSdocks14.rzone.deshades03.rzone.dens1.deziweb.comns2.deziweb.comnszero1.axc.nlnszero2.axc.nlMXsmtp.rzone.defallback.axc.nlmail.c21.nlmx20.c21.nlA2a01:238:20a:202:1092::81.169.145.92185.10.50.21
●NSdocks14.rzone.de2026-03-26 → 2026-04-13 · 3 obs
○ 2016-07-10 13:16:54
● 2026-03-26 13:08:22
● 2026-04-13 14:45:12
○NSns1.deziweb.com2015-07-20 → 2015-07-20 · 3 obs
● 2015-07-20 12:30:44
○ 2015-10-24 04:34:40
○ 2026-04-13 14:45:12
○NSns2.deziweb.com2015-07-20 → 2015-07-20 · 3 obs
● 2015-07-20 12:30:44
○ 2015-10-24 04:34:40
○ 2026-04-13 14:45:12
○NSnszero1.axc.nl2015-10-24 → 2016-07-10 · 5 obs
○ 2015-07-20 12:30:44
● 2015-10-24 04:34:40
● 2016-07-10 13:16:54
○ 2026-03-26 13:08:22
○ 2026-04-13 14:45:12
○NSnszero2.axc.nl2015-10-24 → 2016-07-10 · 5 obs
○ 2015-07-20 12:30:44
● 2015-10-24 04:34:40
● 2016-07-10 13:16:54
○ 2026-03-26 13:08:22
○ 2026-04-13 14:45:12
●NSshades03.rzone.de2026-03-26 → 2026-04-13 · 3 obs
○ 2016-07-10 13:16:54
● 2026-03-26 13:08:22
● 2026-04-13 14:45:12
○MXfallback.axc.nl2015-10-24 → 2016-07-10 · 5 obs
○ 2015-07-20 12:30:44
● 2015-10-24 04:34:40
● 2016-07-10 13:16:54
○ 2026-03-26 13:08:22
○ 2026-04-13 14:45:12
○MXmail.c21.nl2015-07-20 → 2016-07-10 · 4 obs
● 2015-07-20 12:30:44
● 2016-07-10 13:16:54
○ 2026-03-26 13:08:22
○ 2026-04-13 14:45:12
○MXmx20.c21.nl2015-07-20 → 2015-07-20 · 3 obs
● 2015-07-20 12:30:44
○ 2015-10-24 04:34:40
○ 2026-04-13 14:45:12
●MXsmtp.rzone.de2026-03-26 → 2026-04-13 · 3 obs
○ 2016-07-10 13:16:54
● 2026-03-26 13:08:22
● 2026-04-13 14:45:12
○A185.10.50.212015-07-20 → 2016-07-10 · 4 obs
● 2015-07-20 12:30:44
● 2016-07-10 13:16:54
○ 2026-03-26 13:08:22
○ 2026-04-13 14:45:12
●A2a01:238:20a:202:1092::2026-03-26 → 2026-04-13 · 3 obs
○ 2016-07-10 13:16:54
● 2026-03-26 13:08:22
● 2026-04-13 14:45:12
●A81.169.145.922026-03-26 → 2026-04-13 · 3 obs
○ 2016-07-10 13:16:54
● 2026-03-26 13:08:22
● 2026-04-13 14:45:12

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
nlns1.dns.nl, ns3.dns.nl, ns4.dns.nl-
c21.nldocks14.rzone.de, shades03.rzone.de-

✅ Authoritative Response

Server:217.160.80.141

NS records: docks14.rzone.de, shades03.rzone.de

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 607ms | Queries: -

📄 Records

TypeCountSample Data
A181.169.145.92
AAAA12a01:238:20a:202:1092::
NS2shades03.rzone.de, docks14.rzone.de
MX1smtp.rzone.de (pri: 5)
SOA1docks14.rzone.de hostmaster.strato-rz.de

Analysis

Hierarchy

mx20.c21.nl is a child of c21.nl.

IP Addresses

c21.nl has two IP numbers: 2a01:238:20a:202:1092:: and 81.169.145.92.

Other host names, for instance coaljeans.nl, mcsolf.de, lawinc.eu, gutheim.de and biesy.de share IP numbers with c21.nl.

Name Servers

c21.nl's delegation uses two name servers: docks14.rzone.de and shades03.rzone.de.

c21.nl uses the same name server setup as other domains, such as novastudio.de, cjacobs.net, rosenwerk.de, customercentric.info and vistraco.de.

c21.nl at least partially shares name servers with other domains, including silke-holste.de, visiontools.rentals, zar-bar.com, legiogo.de and mercedesengineparts.com.

These name servers are commonly used with docks02.rzone.de, shades20.rzone.de, docks07.rzone.de, shades07.rzone.de, shades04.rzone.de, shades08.rzone.de, shades17.rzone.de, shades11.rzone.de, docks18.rzone.de and docks12.rzone.de.

Host names with two IPs:

docks14.rzone.de points to 2001:8d8:fe:53:5747:2a74:d:14 and 217.160.80.141

shades03.rzone.de points to 2607:f1c0:fe:53:185:132:34:130 and 185.132.34.130

Mail Servers

A single mail server handles c21.nl, smtp.rzone.de.

c21.nl shares the same mail server setup as other domains, for instance plesk01.userit.net, maildefer.tronchon.info, lichtplannen.com, 53803731.xy.strato-hosting.eu and mailspool.emef.nl.

The host name smtp.rzone.de resolves to two IP numbers: 2a01:238:20a:202:50f0::2097 and 81.169.145.98.