nera.cz - robtex.com
nera.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 81.91.86.14🇨🇿 WEB4U81.91.80.0/21 | ||||||
| PTR | php7.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 | mx1.mailchannels.net ⭐ | ||||||
| A | 54.187.177.89🇺🇸 Amazon54.186.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-54-187-177-89.us-west-2.compute.amazonaws.com | ||||||
| MX | mx2.mailchannels.net ⭐ | ||||||
| A | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.us-west-2.compute.amazonaws.com | ||||||
| TXT | v=spf1 include:_spf.web4u.cz ~all | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-04 #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=1784153839 | ||||||
Same first word
Similar names
DNS History
8 records (5 active, 3 former)
○MXmail.nera.cz2015-07-22 → 2016-05-26 · 4 obs
● 2016-05-26 02:49:02
○ 2020-03-09 17:20:46
○ 2026-07-15 23:19:20
○MXmx.web4u.cz2020-03-09 → 2020-03-09 · 4 obs
● 2020-03-09 17:20:46
○ 2026-06-13 08:15:54
○ 2026-07-15 23:19:20
●MXmx1.mailchannels.net2026-06-13 → 2026-07-15 · 3 obs
● 2026-06-13 08:15:54
● 2026-07-15 23:19:20
●MXmx2.mailchannels.net2026-06-13 → 2026-07-15 · 3 obs
● 2026-06-13 08:15:54
● 2026-07-15 23:19:20
○A81.91.86.102015-07-22 → 2020-03-09 · 4 obs
● 2020-03-09 17:20:46
○ 2026-06-13 08:15:54
○ 2026-07-15 23:19:20
●A81.91.86.142026-06-13 → 2026-07-15 · 3 obs
● 2026-06-13 08:15:54
● 2026-07-15 23:19:20
🔍 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 |
| nera.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 nera.cz (unsigned zone)
⏱️ Timing
Total: 1291ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.14 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| TXT | 1 | v=spf1 include:_spf.web4u.cz ~all |
| 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
IP Addresses
nera.cz resolves to just one IP address, 81.91.86.14.
Two other host names, along with vs904.server4u.cz, mail.vasinova.cz and slechta.de, also share IP numbers with nera.cz.
Name Servers
The NS records for nera.cz delegate to ns2.web4u.cz and ns.web4u.cz.
nera.cz shares its NS records with other domains, for example mindtheapp.cz, gar-age.com, pjsyst.cz and two others.
ns2.web4u.cz resolves to 85.207.53.12 and 2a02:a40:100:28ff::12. Likewise, ns.web4u.cz resolves to 185.14.224.241 and 2001:1568:fd::241 — two IP addresses apiece.
Mail Servers
nera.cz is served by two mail servers, mx1.mailchannels.net and mx2.mailchannels.net.
Among the domains sharing a mail server setup with nera.cz are eliassons.se, sensecraft.com, kialjames.com and two others.
Some mail servers of nera.cz are also used by other domains, notably ookamiprojects.com and workplacesolutions.community.
mx1.mailchannels.net → 54.187.177.89 and mx2.mailchannels.net → 54.69.1.140: one IP number per host name.