knock.cz - robtex.com
knock.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2001:1568::14🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php7.web4u.cz | ||||||
| A | 81.91.86.14🇨🇿 WEB4U81.91.80.0/21 | ||||||
| NS | ns2.web4u.cz ⭐ | ||||||
| A | 2a02:a40:100:28ff::12🇨🇿 BlueTone-AS2a02:a40::/32 Ceske Radiokomunikace, a.s. | ||||||
| PTR | ns2.web4u.cz | ||||||
| A | 85.207.53.12🇨🇿 BlueTone-AS85.207.0.0/16 BlueTone-CRa-CZ Fourth address block | ||||||
| PTR | ns2.web4u.cz | ||||||
| NS | ns.web4u.cz | ||||||
| A | 2001:1568:fd::241🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | ns.web4u.cz | ||||||
| A | 185.14.224.241🇨🇿 WEB4U185.14.224.0/23 | ||||||
| PTR | ns.web4u.cz | ||||||
| MX | mx1.mailchannels.net ⭐ | ||||||
| A | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.us-west-2.compute.amazonaws.com | ||||||
| MX | mx2.mailchannels.net ⭐ | ||||||
| A | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.us-west-2.compute.amazonaws.com | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2026-01-26 #2 | ||||||
cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.ns.nic.cz ⭐ | ||||||
| NS | b.ns.nic.cz | ||||||
| NS | c.ns.nic.cz | ||||||
| NS | d.ns.nic.cz | ||||||
| SOA | a.ns.nic.czhostmaster@nic.cz serial=1776106033 | ||||||
Same first word
knock.co.uk |
knock.cz |
knock.chat |
knock.app |
knock.io |
knock.googlecode.com |
knock.ws |
knock.im |
knock.no |
knock.be |
knock.tel |
knock.it |
knock.agency |
knock.de |
knock.com |
knock.co |
knock.com.mx |
knock.link |
knock.biz |
knock.tw |
Similar names
knkco.com |
okcnk.com |
cnokk.com |
conkk.com |
kkcon.com |
kncok.com |
ckokn.com |
nkkco.jp |
nokck.com |
kkcon.de |
nokck.org |
kokcn.cn |
DNS History
15 records (6 active, 9 former)
○NSa.ns.gohost.cz2017-04-20 → 2017-04-20 · 4 obs
● 2017-04-20 00:01:02
○ 2026-04-08 04:20:48
○ 2026-04-13 19:15:10
○NSalfa.ns.active24.cz2015-08-08 → 2016-09-20 · 4 obs
● 2016-09-20 10:17:04
○ 2017-04-20 00:01:02
○ 2026-04-13 19:15:10
○NSb.ns.gohost.cz2017-04-20 → 2017-04-20 · 4 obs
● 2017-04-20 00:01:02
○ 2026-04-08 04:20:48
○ 2026-04-13 19:15:10
○NSbeta.ns.active24.cz2015-08-08 → 2016-09-20 · 4 obs
● 2016-09-20 10:17:04
○ 2017-04-20 00:01:02
○ 2026-04-13 19:15:10
○NSgama.ns.active24.sk2015-08-08 → 2016-09-20 · 4 obs
● 2016-09-20 10:17:04
○ 2017-04-20 00:01:02
○ 2026-04-13 19:15:10
●NSns.web4u.cz2026-04-08 → 2026-04-13 · 3 obs
● 2026-04-08 04:20:48
● 2026-04-13 19:15:10
●NSns2.web4u.cz2026-04-08 → 2026-04-13 · 3 obs
● 2026-04-08 04:20:48
● 2026-04-13 19:15:10
○MXmail.gohost.cz2017-04-20 → 2017-04-20 · 3 obs
○ 2026-04-08 04:20:48
○ 2026-04-13 19:15:10
●MXmx1.mailchannels.net2026-04-08 → 2026-04-13 · 3 obs
● 2026-04-08 04:20:48
● 2026-04-13 19:15:10
●MXmx2.mailchannels.net2026-04-08 → 2026-04-13 · 3 obs
● 2026-04-08 04:20:48
● 2026-04-13 19:15:10
●A2001:1568::142026-04-08 → 2026-04-13 · 3 obs
● 2026-04-08 04:20:48
● 2026-04-13 19:15:10
○A2001:41d0:302:2100::5ca62017-04-20 → 2017-04-20 · 4 obs
● 2017-04-20 00:01:02
○ 2026-04-08 04:20:48
○ 2026-04-13 19:15:10
○A79.137.34.1032017-04-20 → 2017-04-20 · 4 obs
● 2017-04-20 00:01:02
○ 2026-04-08 04:20:48
○ 2026-04-13 19:15:10
●A81.91.86.142026-04-08 → 2026-04-13 · 3 obs
● 2026-04-08 04:20:48
● 2026-04-13 19:15:10
○A81.95.96.292015-08-08 → 2016-09-20 · 4 obs
● 2016-09-20 10:17:04
○ 2017-04-20 00:01:02
○ 2026-04-13 19:15:10
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| knock.cz | ns.web4u.cz, ns2.web4u.cz | 4 records |
✅ Authoritative Response
Server:185.14.224.241
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 908ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.14 |
| AAAA | 1 | 2001:1568::14 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
IP Addresses
knock.cz points to two IPs: 2001:1568::14 and 81.91.86.14.
Other host names including kcatering.net, *.ddnachod.cz, mail.inpek.cz, fenestra-wieden.cz and interierzone.cz share IP numbers with knock.cz.
Name Servers
knock.cz's delegation uses two name servers, ns2.web4u.cz and ns.web4u.cz.
knock.cz shares the same name server setup as other domains, for example goandsport.cz, kasperek.cz, gw-int.com, smir.cz and zebriny.cz.
Host names with two IPs:
ns2.web4u.cz points to: 2a02:a40:100:28ff::12 and 85.207.53.12
ns.web4u.cz points to: 2001:1568:fd::241 and 185.14.224.241
Mail Servers
knock.cz is handled by two mail servers: mx1.mailchannels.net and mx2.mailchannels.net.
knock.cz shares its mail server setup with other domains, including uniquesoft.info, darcyf1.com, servitanquesdelcaribe.com, do-gooder.us and didinfo.net.
knock.cz shares some mail servers with other domains, for instance michaelchapman.org, targi.brno.pl, lidemar.com and italydecanted.com.
Host names with a single IP:
- mx1.mailchannels.net points to 54.69.1.140
- mx2.mailchannels.net points to 54.69.1.140
Host names that point to 54.69.1.140: mx1.mailchannels.net and mx2.mailchannels.net