fd.cz - robtex.com
fd.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.84.51🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | wpj.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.fd.cz ⭐ | ||||||
| A | 81.91.84.51🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | wpj.cz | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2013-12-23 #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.czhostmaster@nic.cz serial=1771291036 | ||||||
Subdomains
mail.fd.cz |
Same first word
Similar names
DNS History
4 records (4 active, 0 former)
●MXmail.fd.cz2015-07-21 → 2026-03-09 · 2 obs
● 2026-03-09 20:18:06
●A81.91.84.512015-07-21 → 2026-03-09 · 2 obs
● 2026-03-09 20:18:06
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, d.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz | - |
| fd.cz | ns.web4u.cz, ns2.web4u.cz | 4 records |
✅ Authoritative Response
Server: 85.207.53.12
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1171ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.84.51 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 1 | mail.fd.cz (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns.web4u.cz, ns2.web4u.cz, ns.web4u.cz...)
Analysis
Hierarchy
fd.cz is the parent of mail.fd.cz.
IP Addresses
fd.cz points to IP number 81.91.84.51.
For instance, other host names skiresort.cz, mail.pokojovetermostaty.cz, mail.freestylearea.cz, paex.cz and detske-artex.cz share IP numbers with fd.cz.
Name Servers
fd.cz is delegated to two name servers: ns2.web4u.cz and ns.web4u.cz.
fd.cz uses the same name server setup as other domains such as melisana.cz, ocelikova.cz, comm4u.cz, jakubvrba.cz and biboshoe.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
fd.cz is handled by a single mail server, mail.fd.cz.
mail.fd.cz points to a single IP: 81.91.84.51.