naros.cz - robtex.com
naros.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 | 54.69.1.140🇺🇸 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 2025-05-03 #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=1778782651 | ||||||
Same first word
Similar names
DNS History
6 records (5 active, 1 former)
○MXmail.naros.cz2015-08-03 → 2018-07-21 · 4 obs
● 2018-07-21 00:26:12
○ 2026-05-12 03:55:58
○ 2026-05-14 18:45:22
●MXmx1.mailchannels.net2026-05-12 → 2026-05-14 · 3 obs
● 2026-05-12 03:55:58
● 2026-05-14 18:45:22
●MXmx2.mailchannels.net2026-05-12 → 2026-05-14 · 3 obs
● 2026-05-12 03:55:58
● 2026-05-14 18:45:22
●A81.91.86.112015-08-03 → 2026-05-14 · 2 obs
● 2026-05-14 18:45:22
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| naros.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: 2436ms | 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 | v=spf1 include:_spf.web4u.cz ~all |
| 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
IP Addresses
naros.cz resolves to a single IP address: 81.91.86.11.
Other host names including fastman.cz, unassigned-81-91-81-185.web4u.cz, rocenka.eu, larsenstrings.cz and onavi.cz share IP numbers with naros.cz.
Name Servers
naros.cz's delegation uses two name servers, ns2.web4u.cz and ns.web4u.cz.
naros.cz shares the same name server setup as other domains, for example bioinformatiku.cz, chvalovsky.cz, stepanek.eu, tanecnipodlozky.cz and snowgarden.eu.
naros.cz at least partially shares name servers with other domains; for instance spravadomen.org.
Host names with two IPs:
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
naros.cz is handled by two mail servers: mx1.mailchannels.net and mx2.mailchannels.net.
naros.cz shares its mail server setup with other domains, including foneducor.com, westcentraldistrictcccu.org, spinforce.com, letsmultiply.com and jerzydrozdbasses.com.
Host names with a single IP:
mx1.mailchannels.net points to 54.187.177.89.
mx2.mailchannels.net points to 54.69.1.140.