czert.eu - robtex.com
czert.eu
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2001:1568::14🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php7.web4u.cz | ||||||
| A | 81.91.86.14🇨🇿 WEB4U81.91.80.0/21 | ||||||
| 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 | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.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 | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-06 #0 | ||||||
eu
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | si.dns.eu ⭐ | ||||||
| NS | be.dns.eu | ||||||
| NS | w.dns.eu | ||||||
| NS | x.dns.eu | ||||||
| NS | y.dns.eu | ||||||
| SOA | si.dns.eutech@eurid.eu serial=1126930742 | ||||||
Same first word
Similar names
crtez.com |
zectr.com |
ctrez.com |
eztrc.com |
zcert.it |
zretc.net |
certz.com |
cretz.eu |
ztcre.cn |
tezrc.com |
czrte.com |
ezcrt.net |
cretz.com |
ezrtc.com |
zrect.com |
zrtec.com |
zcert.com |
certz.org |
zretc.com |
ztcre.com |
zectr.io |
DNS History
10 records (6 active, 4 former)
○NSns.forpsi.cz2015-08-01 → 2018-09-22 · 4 obs
● 2018-09-22 07:23:44
○ 2026-06-10 05:10:46
○ 2026-08-10 11:52:38
○NSns.forpsi.net2015-08-01 → 2018-09-22 · 4 obs
● 2018-09-22 07:23:44
○ 2026-06-10 05:10:46
○ 2026-08-10 11:52:38
○NSns.forpsi.us2015-08-01 → 2018-09-22 · 4 obs
● 2018-09-22 07:23:44
○ 2026-06-10 05:10:46
○ 2026-08-10 11:52:38
●NSns.web4u.cz2026-06-10 → 2026-08-10 · 3 obs
● 2026-06-10 05:10:46
● 2026-08-10 11:52:38
●NSns2.web4u.cz2026-06-10 → 2026-08-10 · 3 obs
● 2026-06-10 05:10:46
● 2026-08-10 11:52:38
●MXmx1.mailchannels.net2026-06-10 → 2026-08-10 · 2 obs
● 2026-08-10 11:52:38
●MXmx2.mailchannels.net2026-06-10 → 2026-08-10 · 2 obs
● 2026-08-10 11:52:38
●A2001:1568::142026-06-10 → 2026-08-10 · 3 obs
● 2026-06-10 05:10:46
● 2026-08-10 11:52:38
○A81.2.209.332015-08-01 → 2018-09-22 · 4 obs
● 2018-09-22 07:23:44
○ 2026-06-10 05:10:46
○ 2026-08-10 11:52:38
●A81.91.86.142026-06-10 → 2026-08-10 · 3 obs
● 2026-06-10 05:10:46
● 2026-08-10 11:52:38
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| eu | w.dns.eu, x.dns.eu, y.dns.eu, be.dns.eu... | - |
| czert.eu | ns.web4u.cz, ns2.web4u.cz | - |
✅ 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: 912ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.14 |
| AAAA | 1 | 2001:1568::14 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
Analysis
IP Addresses
czert.eu points to the IP addresses 81.91.86.14 and 2001:1568::14
Two other host names, along with siskuvmlyn.cz, mladyjecmen.net and promorain.cz, also share IP numbers with czert.eu.
Name Servers
The NS records for czert.eu delegate to ns2.web4u.cz and ns.web4u.cz.
czert.eu shares its NS records with other domains, for example krasnadovolena.cz, ote.cz, pikal.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
czert.eu is served by two mail servers, mx1.mailchannels.net and mx2.mailchannels.net.
Among the domains sharing a mail server setup with czert.eu are discoverpreschool.net, elsuper.eu, intranovo.com and two others.
Each of mx1.mailchannels.net and mx2.mailchannels.net points to exactly one IP address: 54.69.1.140.
mx1.mailchannels.net and mx2.mailchannels.net each have 54.69.1.140 IP addresses.