`github.cz`

DNSSEC	🔒 Signed (DS record present)
NS	`ns.kraxnet.cz` ⭐
		A	2001:67c:48::53^{🇨🇿 KRAXNET-AS2001:67c:48::/48 XNET}
		A	178.217.247.2^{🇨🇿 KRAXNET-AS178.217.240.0/21 KRAXNET s.r.o.}
			PTR	`ns.kraxnet.cz`
NS	`ns.kraxnet.com`
		A	212.24.155.205^{🇨🇿 QUANTCOM-AS212.24.128.0/19 Dial Telecom, a.s.}
SOA	`ns.kraxnet.cz`admin@kraxnet.cz 2026-07-12 #1

`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.cz`hostmaster@nic.cz serial=1784729842

Same first word

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github.nl

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DNS History

2 records (2 active, 0 former)

●NSns.kraxnet.com2015-08-20 → 2026-07-22 · 2 obs

● 2015-08-20 10:25:46
● 2026-07-22 14:49:24

●NSns.kraxnet.cz2015-08-20 → 2026-07-22 · 2 obs

● 2015-08-20 10:25:46
● 2026-07-22 14:49:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
github.cz	ns.kraxnet.cz, ns.kraxnet.com	2 records

✅ Authoritative Response

Server:212.24.155.205

NS records: ns.kraxnet.cz, ns.kraxnet.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 4165ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`ns.kraxnet.com, ns.kraxnet.cz`
SOA	1	`ns.kraxnet.cz admin.kraxnet.cz`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.kraxnet.cz, ns.kraxnet.cz)

Analysis

Name Servers

github.cz is served by two delegated name servers, ns.kraxnet.com and ns.kraxnet.cz.

github.cz has the same name server delegation as a number of other domains, such as namytine.cz, futaba.cz, arkana.cz and two more.

The DNS delegation for github.cz at least partly coincides with that of other domains, zubni.net being one example.

Hosts with two IP numbers each:

ns.kraxnet.cz maps to two IP addresses — 178.217.247.2 and 2001:67c:48::53.

Hosts that resolve to one IP address:

ns.kraxnet.com points to the IP address 212.24.155.205.

github.cz - dns.ninja

github.cz

cz