linux.cz - dns.ninja
linux.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | anxur.fi.muni.cz ⭐ | ||||||
| A | 147.251.48.3🇨🇿 CESNET147.251.0.0/16 MUNI-TCZ | ||||||
| PTR | anxur.fi.muni.cz | ||||||
| NS | ns2.afraid.org | ||||||
| A | 2001:1850:1:5:800::6b🇺🇸 ASN-CQ-GIGENET2001:1850::/32 GIGENET IPV6 ROUTE | ||||||
| PTR | ns2.afraid.org | ||||||
| A | 69.65.50.223🇺🇸 ASN-CQ-GIGENET69.65.0.0/18 GigENET Netblock | ||||||
| NS | ns3.math.muni.cz | ||||||
| A | 147.251.80.8🇨🇿 CESNET147.251.0.0/16 MUNI-TCZ | ||||||
| MX | relay.muni.cz ⭐ | ||||||
| A | 147.251.4.35🇨🇿 CESNET147.251.0.0/16 MUNI-TCZ | ||||||
| PTR | relay.muni.cz | ||||||
| TXT | Faculty of Informatics, Masaryk University Brno | ||||||
| TXT | Czech Linux Users Group | ||||||
| TXT | v=spf1 mx/24 ip4:147.251.0.0/24 ip6:2001:718:801:230::0/56 ?all | ||||||
| TXT | Botanicka 68a, 602 00, Brno, Czech republic | ||||||
| SOA | anxur.fi.muni.czpostmaster@linux.cz 2026-04-16 #1 | ||||||
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=1784506640 | ||||||
rank #698 in the tld
WOT: SAFE (80/100)
📈 Tranco rank: #237,078
Subdomains
Same first word
Similar names
DNS History
5 records (4 active, 1 former)
●NSanxur.fi.muni.cz2015-06-24 → 2026-07-20 · 2 obs
● 2026-07-20 00:53:08
○NSns1.math.muni.cz2015-06-24 → 2019-07-25 · 4 obs
● 2019-07-25 04:35:34
○ 2026-02-16 04:44:34
○ 2026-07-20 00:53:08
●NSns2.afraid.org2015-06-24 → 2026-07-20 · 2 obs
● 2026-07-20 00:53:08
●NSns3.math.muni.cz2026-02-16 → 2026-07-20 · 3 obs
● 2026-02-16 04:44:34
● 2026-07-20 00:53:08
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz, a.ns.nic.cz | - |
| linux.cz | ns2.afraid.org, ns3.math.muni.cz, anxur.fi.muni.cz | - |
✅ Authoritative Response
Server:147.251.80.8
NS records: ns2.afraid.org, ns3.math.muni.cz, anxur.fi.muni.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 3315ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 3 | ns3.math.muni.cz, ns2.afraid.org... |
| MX | 1 | relay.muni.cz (pri: 50) |
| TXT | 4 | Faculty of Informatics, Masaryk Universi, Czech Linux Users Group... |
| SOA | 1 | anxur.fi.muni.cz postmaster.linux.cz |
Analysis
Hierarchy
proc.linux.cz, community.linux.cz, ultra.linux.cz, www.linux.cz, odysseus.linux.cz and a few other host names are all children of linux.cz.
Name Servers
linux.cz is delegated to three name servers: ns2.afraid.org, anxur.fi.muni.cz and ns3.math.muni.cz.
The name servers of linux.cz overlap at least partially with those of other domains — among them simplynudist.com, cetapsa.com, jorn.net and two more.
These name servers commonly appear in delegations together with ns1.afraid.org, ns3.afraid.org, ns4.afraid.org and 3 other.
Host names that have two IP addresses:
ns2.afraid.org points to 69.65.50.223 and 2001:1850:1:5:800::6b.
Host names that point to one IP address:
anxur.fi.muni.cz points to 147.251.48.3.
ns3.math.muni.cz points to 147.251.80.8.
Mail Servers
The sole mail server for linux.cz is relay.muni.cz.
Among the domains sharing a mail server setup with linux.cz are kuduk12.ics.muni.cz, naiada23.fi.muni.cz, pafos.fi.muni.cz and two others.
relay.muni.cz resolves to a single IP number: 147.251.4.35.