code-fu.cz - dns.ninja

`code-fu.cz`

DNSSEC	⚠️ Not signed
A	81.91.92.82^{🇨🇿 WEB4U81.91.88.0/21}
		PTR	`rafc.wejn.org`
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	`mx.wejn.org` ⭐
		A	2001:1568:f:298::1^{🇨🇿 WEB4U2001:1568::/33}
			PTR	`rafc.wejn.org`
		A	81.91.92.82^{🇨🇿 WEB4U81.91.88.0/21}
			PTR	`rafc.wejn.org`
TXT	`v=spf1 redirect=wejn.org`
SOA	`ns.web4u.cz`admin@web4u.cz 2008-05-24 #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=1786315642

Same first word

code-fu.de

code-fu.co.uk

code-fu.net

code-fu.dk

code-fu.cz

code-fu.net.ni

DNS History

6 records (4 active, 2 former)

●NSns.web4u.cz2015-07-14 → 2026-08-10 · 2 obs

● 2015-07-14 01:52:00
● 2026-08-10 00:03:58

●NSns2.web4u.cz2015-07-14 → 2026-08-10 · 2 obs

● 2015-07-14 01:52:00
● 2026-08-10 00:03:58

●MXmx.wejn.org2026-03-13 → 2026-08-10 · 3 obs

○ 2017-04-01 16:02:48
● 2026-03-13 04:10:34
● 2026-08-10 00:03:58

○MXpalladium.wejn.cz2015-07-14 → 2017-04-01 · 4 obs

● 2015-07-14 01:52:00
● 2017-04-01 16:02:48
○ 2026-03-13 04:10:34
○ 2026-08-10 00:03:58

○A81.91.81.1032015-07-14 → 2017-04-01 · 4 obs

● 2015-07-14 01:52:00
● 2017-04-01 16:02:48
○ 2026-03-13 04:10:34
○ 2026-08-10 00:03:58

●A81.91.92.822026-03-13 → 2026-08-10 · 3 obs

○ 2017-04-01 16:02:48
● 2026-03-13 04:10:34
● 2026-08-10 00:03:58

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
code-fu.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

⚠️ Insecure (no DNSSEC)

No DS record for code-fu.cz (unsigned zone)

⏱️ Timing

Total: 922ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.91.92.82`
NS	2	`ns.web4u.cz, ns2.web4u.cz`
MX	1	`mx.wejn.org (pri: 5)`
TXT	1	`v=spf1 redirect=wejn.org`
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

code-fu.cz points to a single IP number: 81.91.92.82.

Additional host names — wejn.biz, rafc.wejn.org, mx.wejn.org and two others — share IP numbers with code-fu.cz.

Name Servers

DNS delegation for code-fu.cz points to two name servers: ns2.web4u.cz and ns.web4u.cz.

code-fu.cz shares its name server setup with other domains, including kmdu.cz, tilia-interiery.cz, zarges.cz and two others.

ns2.web4u.cz directs to 85.207.53.12 and 2a02:a40:100:28ff::12. ns.web4u.cz directs to 185.14.224.241 and 2001:1568:fd::241. Each host name carries two IP addresses.

Mail Servers

code-fu.cz has one mail server: mx.wejn.org.

code-fu.cz shares the same mail server setup as other domains, including wejn.info, wejn.com, wejn.cz and two others.

mx.wejn.org resolves to two IP numbers — 81.91.92.82 and 2001:1568:f:298::1.