onlinecomp.com - robtex.com
onlinecomp.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.83.105🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | vstest133.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.onlinecomp.com ⭐ | ||||||
| A | 81.91.83.105🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | vstest133.server4u.cz | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2010-02-22 #1 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1783813882 | ||||||
Subdomains
mail.onlinecomp.com |
Same first word
onlinecomp.com |
onlinecomp.eu |
Similar names
DNS History
4 records (4 active, 0 former)
●MXmail.onlinecomp.com2015-05-22 → 2026-07-11 · 2 obs
● 2026-07-11 23:56:14
●A81.91.83.1052015-05-22 → 2026-07-11 · 2 obs
● 2026-07-11 23:56:14
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| onlinecomp.com | ns.web4u.cz, ns2.web4u.cz | - |
✅ Authoritative Response
Server:85.207.53.12
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for onlinecomp.com (unsigned zone)
⏱️ Timing
Total: 762ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.83.105 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 1 | mail.onlinecomp.com (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
Analysis
Hierarchy
onlinecomp.com is the parent zone for mail.onlinecomp.com.
IP Addresses
onlinecomp.com resolves to one IP address: 81.91.83.105.
mail.onlinecomp.com, for instance, is one of the other host names sharing IP numbers with onlinecomp.com.
Name Servers
onlinecomp.com uses two name servers for its delegation: ns2.web4u.cz and ns.web4u.cz.
onlinecomp.com uses the same name servers as several other domains — among them cloudforge.cz, goandsport.cz, kasperek.cz and two more.
The two host names ns2.web4u.cz and ns.web4u.cz each have a pair of IP addresses: ns2.web4u.cz has 85.207.53.12 and 2a02:a40:100:28ff::12, and ns.web4u.cz has 185.14.224.241 and 2001:1568:fd::241.
Mail Servers
Mail for onlinecomp.com is handled by a single mail server, mail.onlinecomp.com.
mail.onlinecomp.com directs to just one IP number, 81.91.83.105.