fun4u.cz - robtex.com
fun4u.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.84.210🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | m107.server4u.cz | ||||||
| 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 | mail.fun4u.cz ⭐ | ||||||
| A | 81.91.84.210🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | m107.server4u.cz | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-04-07 #0 | ||||||
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=1777405637 | ||||||
Subdomains
Same first word
fun4u.events |
fun4u.ru |
fun4u.nl |
fun4u.at |
fun4u.tw |
fun4u.org |
fun4u.cz |
fun4u.com |
fun4u.no |
fun4u.co.za |
fun4u.cn |
fun4u.de |
fun4u.dk |
fun4u.be |
Similar names
DNS History
13 records (4 active, 9 former)
○NSdns.nethost.cz2018-08-25 → 2018-08-25 · 4 obs
● 2018-08-25 07:02:46
○ 2026-03-22 09:10:40
○ 2026-04-28 20:16:42
○NSns.forpsi.cz2015-08-11 → 2016-09-13 · 4 obs
● 2016-09-13 00:59:14
○ 2018-08-25 07:02:46
○ 2026-04-28 20:16:42
○NSns.forpsi.it2015-08-11 → 2016-09-13 · 4 obs
● 2016-09-13 00:59:14
○ 2018-08-25 07:02:46
○ 2026-04-28 20:16:42
○NSns.forpsi.net2015-08-11 → 2016-09-13 · 4 obs
● 2016-09-13 00:59:14
○ 2018-08-25 07:02:46
○ 2026-04-28 20:16:42
●NSns.web4u.cz2026-03-22 → 2026-04-28 · 3 obs
● 2026-03-22 09:10:40
● 2026-04-28 20:16:42
●NSns2.web4u.cz2026-03-22 → 2026-04-28 · 3 obs
● 2026-03-22 09:10:40
● 2026-04-28 20:16:42
○NSsns.nethost.sk2018-08-25 → 2018-08-25 · 4 obs
● 2018-08-25 07:02:46
○ 2026-03-22 09:10:40
○ 2026-04-28 20:16:42
○NStns.nethost.eu2018-08-25 → 2018-08-25 · 4 obs
● 2018-08-25 07:02:46
○ 2026-03-22 09:10:40
○ 2026-04-28 20:16:42
●MXmail.fun4u.cz2026-03-22 → 2026-04-28 · 3 obs
● 2026-03-22 09:10:40
● 2026-04-28 20:16:42
○MXmail.h-email.net2018-08-25 → 2018-08-25 · 3 obs
○ 2026-03-22 09:10:40
○ 2026-04-28 20:16:42
○A185.53.178.62018-08-25 → 2018-08-25 · 4 obs
● 2018-08-25 07:02:46
○ 2026-03-22 09:10:40
○ 2026-04-28 20:16:42
○A81.2.194.1282015-08-11 → 2016-09-13 · 4 obs
● 2016-09-13 00:59:14
○ 2018-08-25 07:02:46
○ 2026-04-28 20:16:42
●A81.91.84.2102026-03-22 → 2026-04-28 · 3 obs
● 2026-03-22 09:10:40
● 2026-04-28 20:16:42
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | 8 records |
| fun4u.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: 1325ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.84.210 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 1 | mail.fun4u.cz (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 12
In-bailiwick: 8 (a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz...)
Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
Hierarchy
fun4u.cz is a parent of www.fun4u.cz, raz4217.fun4u.cz and mail.fun4u.cz.
IP Addresses
fun4u.cz points to IP number: 81.91.84.210.
Other host names such as staziste.cz, logo4u.cz, zhubnout.info, ceniny.com and mail.ceniny.com share IPs with fun4u.cz.
Name Servers
fun4u.cz is delegated to two name servers: ns2.web4u.cz and ns.web4u.cz.
fun4u.cz shares the same name server setup as socova.cz, montessori-podebrady.cz, encoresystems.cz, adlav.cz and esledovani.cz.
Host names with two IP numbers: 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
fun4u.cz is handled by a single mail server, mail.fun4u.cz.
mail.fun4u.cz points to a single IP: 81.91.84.210.