knot-resolver.cz - robtex.com

knot-resolver.cz

DNSSEC🔒 Signed (DS record present)
A2001:1488:800:400::2:96🇨🇿 CZNIC-AS2001:1488::/32 CZ.NIC, z.s.p.o.
PTRgitlab.nic.cz
A217.31.204.96🇨🇿 CZNIC-AS217.31.192.0/20 CZNIC - NET
NSsld1.ns.nic.cz ⭐
A2001:1488:800:126::98🇨🇿 CZNIC-AS2001:1488::/32 CZ.NIC, z.s.p.o.
PTRsld1.ns.nic.cz
A217.31.207.98🇨🇿 CZNIC-AS217.31.192.0/20 CZNIC - NET
PTRsld1.ns.nic.cz
NSsld2.ns.nic.cz
A2001:1488:800:126::99🇨🇿 CZNIC-AS2001:1488::/32 CZ.NIC, z.s.p.o.
PTRsld2.ns.nic.cz
A217.31.207.99🇨🇿 CZNIC-AS217.31.192.0/20 CZNIC - NET
PTRsld2.ns.nic.cz
NSsld3.ns.nic.cz
A2001:1ab0:7e1e:d150::8:1🇨🇿 IGNUM-AS2001:1ab0::/32 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/
PTRsld3.ns.nic.cz
A217.31.57.6🇨🇿 IGNUM-AS217.31.48.0/20 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/
PTRsld3.ns.nic.cz
MXmail.nic.cz ⭐
A2001:1488:800:400::400🇨🇿 CZNIC-AS2001:1488::/32 CZ.NIC, z.s.p.o.
PTRmail.nic.cz
A217.31.204.67🇨🇿 CZNIC-AS217.31.192.0/20 CZNIC - NET
PTRmail.nic.cz
MXmx.nic.cz(15)
A2001:1ab0:7e1e:d150::8:157🇨🇿 IGNUM-AS2001:1ab0::/32 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/
PTRmx.nic.cz
A217.31.57.157🇨🇿 IGNUM-AS217.31.48.0/20 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/
PTRmx.nic.cz
SOAsld1.ns.nic.czhostmaster@nic.cz serial=1777069984

cz

DNSSEC🔒 Signed (DS record present)
NSa.ns.nic.cz ⭐
NSb.ns.nic.cz
NSc.ns.nic.cz
NSd.ns.nic.cz
SOAa.ns.nic.czhostmaster@nic.cz serial=1777137434
rank #747408 globally
rank #3402 in the tld

Same first word

knot-resolver.cz

DNS History

16 records (7 active, 9 former)

20192020202120222023202420252026NSsld1.ns.nic.czsld2.ns.nic.czsld3.ns.nic.cza.ns.nic.czb.ns.nic.czd.ns.nic.czknot-s-01.nic.czMXmail.nic.czmx.nic.czbh.nic.czA2001:1488:800:400::2:96217.31.204.962001:1488:ac15:ff30::182001:1488:ac15:ff90::130217.31.192.130217.31.192.18
○NSa.ns.nic.cz2018-05-10 → 2020-01-08 · 4 obs
● 2018-05-10 02:57:48
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
○NSb.ns.nic.cz2018-05-10 → 2020-01-08 · 4 obs
● 2018-05-10 02:57:48
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
○NSd.ns.nic.cz2018-05-10 → 2020-01-08 · 4 obs
● 2018-05-10 02:57:48
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
○NSknot-s-01.nic.cz2018-05-10 → 2020-01-08 · 4 obs
● 2018-05-10 02:57:48
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
●NSsld1.ns.nic.cz2026-03-16 → 2026-04-25 · 3 obs
○ 2020-01-08 09:46:42
● 2026-03-16 10:47:24
● 2026-04-25 17:49:18
●NSsld2.ns.nic.cz2026-03-16 → 2026-04-25 · 3 obs
○ 2020-01-08 09:46:42
● 2026-03-16 10:47:24
● 2026-04-25 17:49:18
●NSsld3.ns.nic.cz2026-03-16 → 2026-04-25 · 3 obs
○ 2020-01-08 09:46:42
● 2026-03-16 10:47:24
● 2026-04-25 17:49:18
○MXbh.nic.cz2018-05-10 → 2020-01-08 · 4 obs
● 2018-05-10 02:57:48
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
●MXmail.nic.cz2018-05-10 → 2026-04-25 · 2 obs
● 2018-05-10 02:57:48
● 2026-04-25 17:49:18
●MXmx.nic.cz2018-05-10 → 2026-04-25 · 2 obs
● 2018-05-10 02:57:48
● 2026-04-25 17:49:18
●A2001:1488:800:400::2:962026-03-16 → 2026-04-25 · 3 obs
○ 2020-01-08 09:46:42
● 2026-03-16 10:47:24
● 2026-04-25 17:49:18
○A2001:1488:ac15:ff30::182018-05-10 → 2018-07-06 · 4 obs
● 2018-05-10 02:57:48
● 2018-07-06 06:07:12
○ 2018-09-26 20:37:08
○ 2026-04-25 17:49:18
○A2001:1488:ac15:ff90::1302018-09-26 → 2020-01-08 · 5 obs
○ 2018-07-06 06:07:12
● 2018-09-26 20:37:08
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
○A217.31.192.1302018-09-26 → 2020-01-08 · 5 obs
○ 2018-07-06 06:07:12
● 2018-09-26 20:37:08
● 2020-01-08 09:46:42
○ 2026-03-16 10:47:24
○ 2026-04-25 17:49:18
○A217.31.192.182018-05-10 → 2018-07-06 · 4 obs
● 2018-05-10 02:57:48
● 2018-07-06 06:07:12
○ 2018-09-26 20:37:08
○ 2026-04-25 17:49:18
●A217.31.204.962026-03-16 → 2026-04-25 · 3 obs
○ 2020-01-08 09:46:42
● 2026-03-16 10:47:24
● 2026-04-25 17:49:18

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz-
knot-resolver.czsld1.ns.nic.cz, sld2.ns.nic.cz, sld3.ns.nic.cz-

✅ Authoritative Response

Server:217.31.57.6

NS records: sld1.ns.nic.cz, sld2.ns.nic.cz, sld3.ns.nic.cz

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 1679ms | Queries: -

📄 Records

TypeCountSample Data
A1217.31.204.96
AAAA12001:1488:800:400::2:96
NS3sld2.ns.nic.cz, sld3.ns.nic.cz...
MX2mail.nic.cz (pri: 10), mx.nic.cz (pri: 15)
SOA1sld1.ns.nic.cz hostmaster.nic.cz

Analysis

IP Addresses

knot-resolver.cz points to two IP numbers: 2001:1488:800:400::2:96 and 217.31.204.96.

Other host names, for instance gitlab-r-01.nic.cz, dnssec-validator.cz, datovka.cz, gitlab.nic.cz and jakfungujedns.cz share IP numbers with knot-resolver.cz.

Name Servers

The delegation for knot-resolver.cz is handled by three name servers: sld1.ns.nic.cz, sld2.ns.nic.cz and sld3.ns.nic.cz.

knot-resolver.cz at least partially shares name servers with other domains, for instance romanzach.cz, podepsano.cz, jaknainternet.cz, calcifer.nic.cz and cctld-managers.org.

Two IP numbers per host:

sld1.ns.nic.cz points to 2001:1488:800:126::98 and 217.31.207.98.

sld2.ns.nic.cz points to 2001:1488:800:126::99 and 217.31.207.99.

sld3.ns.nic.cz points to 2001:1ab0:7e1e:d150::8:1 and 217.31.57.6.

Mail Servers

knot-resolver.cz is handled by two mail servers: mail.nic.cz and mx.nic.cz.

knot-resolver.cz uses the same mail server configuration as other domains, such as nebojteseinternetu.cz, knot-dns.cz, return.nic.cz, tld.cz and edushield.cz.

knot-resolver.cz shares mail servers with other domains at least in part, for instance gw.nic.cz, fred.nic.cz, test-ipv6.nic.cz, lists.nic.cz and cctld-managers.org.

Host names with two IP numbers: mail.nic.cz points to 2001:1488:800:400::400 and 217.31.204.67; mx.nic.cz points to 2001:1ab0:7e1e:d150::8:157 and 217.31.57.157.