olc.cz - robtex.com
olc.cz
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=1771291036 | ||||||
Subdomains
sentry.olc.cz |
mail.olc.cz |
gitlab-pages.olc.cz |
www.olc.cz |
Same first word
Similar names
DNS History
15 records (6 active, 9 former)
●NSjaguar.blueboard.cz2026-02-17 → 2026-03-08 · 3 obs
● 2026-02-17 00:11:54
● 2026-03-08 06:46:04
○NSns.profiwh.com2009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
○NSns.profiwh.cz2009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
○NSns.profiwh.info2009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
○NSns.profiwh.net2009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
●NSns2.blueboard.cz2015-08-24 → 2026-03-08 · 3 obs
● 2015-08-24 12:11:46
● 2026-03-08 06:46:04
●NSshinzon.blueboard.cz2015-08-24 → 2026-03-08 · 3 obs
● 2015-08-24 12:11:46
● 2026-03-08 06:46:04
○MXantispam.profiwh.com2009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
○MXbackup.mail.profiwh.com2009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
○MXjaguar.blueboard.cz2015-08-24 → 2017-10-08 · 5 obs
● 2015-08-24 12:11:46
● 2017-10-08 07:34:24
○ 2020-05-15 01:10:42
○ 2026-03-08 06:46:04
○MXns2.blueboard.cz2015-08-24 → 2017-10-08 · 5 obs
● 2015-08-24 12:11:46
● 2017-10-08 07:34:24
○ 2020-05-15 01:10:42
○ 2026-03-08 06:46:04
●MXolc-cz.mail.protection.outlook.com2020-05-15 → 2026-03-08 · 3 obs
● 2020-05-15 01:10:42
● 2026-03-08 06:46:04
●A2001:1528:240::1f2015-08-24 → 2026-03-08 · 3 obs
● 2015-08-24 12:11:46
● 2026-03-08 06:46:04
●A217.11.249.1412015-08-24 → 2026-03-08 · 3 obs
● 2015-08-24 12:11:46
● 2026-03-08 06:46:04
○A85.93.165.1222009-01-16 → 2009-01-16 · 3 obs
○ 2015-08-24 12:11:46
○ 2026-03-08 06:46:04
🔍 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 |
| olc.cz | ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz | 3 records |
✅ Authoritative Response
Server: 178.251.187.7
NS records: ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1219ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 217.11.249.141 |
| AAAA | 1 | 2001:1528:240::1f |
| NS | 2 | shinzon.blueboard.cz, ns2.blueboard.cz |
| MX | 1 | olc-cz.mail.protection.outlook.com (pri: |
| TXT | 5 | facebook-domain-verification=6tff2pav8aq, _globalsign-domain-verification=XVmH1Sua... |
| SOA | 1 | shinzon.blueboard.cz hostmaster.blueboar |
📌 Glue Records Collected
Total: 11
In-bailiwick: 8 (a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz...)
Out-of-bailiwick: 3 (ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz)
Analysis
Hierarchy
olc.cz is a parent of sentry.olc.cz, mail.olc.cz, gitlab-pages.olc.cz and www.olc.cz.
IP Addresses
olc.cz resolves to two IP numbers: 2001:1528:240::1f and 217.11.249.141.
Other host names, for instance malan.cz, yogata.cz, reichmoto.cz, 1fd.eu and trolejbusyvpraze.net share IP numbers with olc.cz.
Name Servers
olc.cz is delegated to three name servers: jaguar.blueboard.cz, ns2.blueboard.cz and shinzon.blueboard.cz.
olc.cz partially shares name servers with other domains; examples include spotless.cz, vrkoc.eu, trabantsraz.cz, hotelsrejber.cz and scrumadoption.com.
these name servers are commonly used with the name servers ns2.miniserver.cz.
Host names with two IP numbers:
jaguar.blueboard.cz points to 2a00:1ed0:45::c and 178.251.187.8.
ns2.blueboard.cz points to 2a01:4f8:13b:8d4::2 and 195.201.57.122.
shinzon.blueboard.cz points to 2a00:1ed0:45::b and 178.251.187.7.
Mail Servers
olc.cz is handled by a single mail server, olc-cz.mail.protection.outlook.com.
Hostname olc-cz.mail.protection.outlook.com points to eight IP numbers: 2a01:111:f403:ca09::2, 2a01:111:f403:ca09::8, 2a01:111:f403:ca09::b, 2a01:111:f403:ca09::e, 52.101.68.18, 52.101.68.32, 52.101.73.24 and 52.101.73.153.