4tex.cz - robtex.com
4tex.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| 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 | 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 | 54.187.177.89🇺🇸 Amazon54.186.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-54-187-177-89.us-west-2.compute.amazonaws.com | ||||||
| TXT | google-site-verification=qioU7utWqhANrnpnt1WmK22-u-mWR6s0lrcN7uq1gTw | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2026-04-29 #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=1778471235 | ||||||
Subdomains
mail.4tex.cz |
Same first word
Similar names
4ext.net |
xt4e.com |
et4x.com |
xet4.vip |
tex4.dev |
4ext.org |
4ext.info |
t4ex.com |
ext4.com |
4ext.com |
tex4.life |
ext4.com.br |
4ext.at |
tex4.com |
e4tx.com |
ext4.ru |
ext4.xyz |
DNS History
6 records (5 active, 1 former)
○MXmail.4tex.cz2015-07-08 → 2018-06-23 · 4 obs
● 2018-06-23 07:07:24
○ 2026-04-29 10:54:54
○ 2026-05-11 04:36:38
●MXmx1.mailchannels.net2026-04-29 → 2026-05-11 · 3 obs
● 2026-04-29 10:54:54
● 2026-05-11 04:36:38
●MXmx2.mailchannels.net2026-04-29 → 2026-05-11 · 3 obs
● 2026-04-29 10:54:54
● 2026-05-11 04:36:38
●A81.91.86.112015-07-08 → 2026-05-11 · 2 obs
● 2026-05-11 04:36:38
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | - |
| 4tex.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: 4668ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.11 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| TXT | 1 | google-site-verification=qioU7utWqhANrnp |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
Hierarchy
4tex.cz is the parent of mail.4tex.cz.
IP Addresses
4tex.cz points to IP number 81.91.86.11.
For instance, other host names unassigned-195-39-95-3.web4u.cz, unassigned-185-14-224-0.web4u.cz, unassigned-81-91-85-48.web4u.cz, unassigned-81-91-87-202.web4u.cz and actima.cz share IP numbers with 4tex.cz.
Name Servers
4tex.cz is delegated to two name servers: ns2.web4u.cz and ns.web4u.cz.
4tex.cz uses the same name server setup as other domains such as m-group.cz, randak.cz, aelcz.cz, fivvalencia.com and varicad.pt.
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
Two mail servers mx1.mailchannels.net and mx2.mailchannels.net handle 4tex.cz.
4tex.cz shares the same mail server setup as other domains, for instance lafleurcounseling.com, russbro.com, alto.co, mvcoho.org and hectorvalle.com.
Host names with a single IP
mx1.mailchannels.net points to: 54.187.177.89
mx2.mailchannels.net points to: 54.187.177.89
Host names pointing to 54.187.177.89: mx1.mailchannels.net and mx2.mailchannels.net