cerrum.com - dns.ninja
cerrum.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.86.11🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | php5.web4u.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 | mx.web4u.cz ⭐ | ||||||
| A | 2001:1568::7012🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | mx.web4u.cz | ||||||
| A | 81.91.87.12🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | mx.web4u.cz | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2009-05-05 #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=1785668817 | ||||||
Subdomains
mail.cerrum.com |
Same first word
cerrum.com |
Similar names
DNS History
5 records (4 active, 1 former)
○MXmail.cerrum.com2015-08-22 → 2017-01-23 · 4 obs
● 2017-01-23 23:10:58
○ 2026-03-03 17:49:42
○ 2026-08-02 11:34:20
●MXmx.web4u.cz2026-03-03 → 2026-08-02 · 3 obs
● 2026-03-03 17:49:42
● 2026-08-02 11:34:20
●A81.91.86.112015-08-22 → 2026-08-02 · 2 obs
● 2026-08-02 11:34:20
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, d.gtld-servers.net, m.gtld-servers.net, a.gtld-servers.net... | - |
| cerrum.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 cerrum.com (unsigned zone)
⏱️ Timing
Total: 548ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.11 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 1 | mx.web4u.cz (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
Analysis
Hierarchy
cerrum.com is a parent domain of mail.cerrum.com.
IP Addresses
cerrum.com has exactly one IP address — 81.91.86.11.
unassigned-81-91-92-179.web4u.cz, auto-moto.cz, unassigned-81-91-82-195.web4u.cz plus two other host names have IP numbers in common with cerrum.com.
Name Servers
DNS delegation for cerrum.com points to two name servers: ns2.web4u.cz and ns.web4u.cz.
The name server configuration of cerrum.com is shared with other domains, for instance koupelny-rubidea.cz, laktoscollection.cz, marytax.cz and two others.
cerrum.com has partial name server overlap with other domains, including mnd-drilling.com.
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
cerrum.com uses one mail server — mx.web4u.cz.
The mail server setup of cerrum.com matches that of other domains such as ip-lorenz.cz, hvlp.cz, perfectcolor.cz and two others.
At least some of the mail servers used by cerrum.com are shared with other domains: dentino.cz, smart4smart.cz, basic-numbers.com and two others among them.
mx.web4u.cz points to two IP addresses: 81.91.87.12 and 2001:1568::7012.