obschool.cz - robtex.com
obschool.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 217.31.49.238🇨🇿 IGNUM-AS217.31.48.0/20 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/ | ||||||
| NS | ns1.ignum.com ⭐ | ||||||
| A | 2a00:1e40:a:53::5🇸🇰 IGNUM-AS2a00:1e40:a::/48 | ||||||
| PTR | ns1-bra.core.webglobe.com | ||||||
| A | 185.65.223.35🇸🇰 IGNUM-AS185.65.223.0/24 | ||||||
| PTR | ns1-bra.core.webglobe.com | ||||||
| NS | ns2.ignum.cz | ||||||
| A | 2001:1ab0:7e1e:2::5🇨🇿 IGNUM-AS2001:1ab0::/32 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/ | ||||||
| PTR | ns2-prg.core.webglobe.com | ||||||
| A | 217.31.48.201🇨🇿 IGNUM-AS217.31.48.0/20 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/ | ||||||
| PTR | ns2-prg.core.webglobe.com | ||||||
| MX | mail8.ignum.cz ⭐ | ||||||
| A | 62.109.151.89🇨🇿 IGNUM-AS62.109.128.0/19 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/ | ||||||
| MX | mail2.ignum.cz(12) | ||||||
| A | 62.109.128.119🇨🇿 IGNUM-AS62.109.128.0/19 Network of Ignum s.r.o. Czech Republic http://www.ignum.cz/ | ||||||
| PTR | mx-lb.core.webglobe.com | ||||||
| SOA | ns1.ignum.comhostmaster@ignum.cz 2026-07-22 #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=1785435440 | ||||||
Same first word
Similar names
DNS History
5 records (5 active, 0 former)
●A217.31.49.2382015-08-07 → 2026-07-30 · 2 obs
● 2026-07-30 18:47:54
🔍 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 |
| obschool.cz | ns1.ignum.com, ns2.ignum.cz | 2 records |
✅ Authoritative Response
Server:185.65.223.35
NS records: ns1.ignum.com, ns2.ignum.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1160ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 217.31.49.238 |
| NS | 2 | ns2.ignum.cz, ns1.ignum.com |
| MX | 2 | mail8.ignum.cz (pri: 11), mail2.ignum.cz (pri: 12) |
| SOA | 1 | ns1.ignum.com hostmaster.ignum.cz |
📌 Glue Records Collected
Total: 10
In-bailiwick: 8 (a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz...)
Out-of-bailiwick: 2 (ns2.ignum.cz, ns2.ignum.cz)
Analysis
IP Addresses
obschool.cz points to a single IP number: 217.31.49.238.
Additional host names — sylk.cz, stand-up.cz, 4sr.es and two others — share IP numbers with obschool.cz.
Name Servers
obschool.cz is served by two delegated name servers, ns1.ignum.com and ns2.ignum.cz.
obschool.cz shares its name server setup with other domains, including rox.cz, itagent.cz, hatas.cz and two others.
There is at least partial name server overlap between obschool.cz and other domains — resco.cz, mercedesclub.cz, alsglobal.co.uk and two more among them.
These name servers are routinely deployed together with the name servers ns1.webcloud.cz.
Each of the two host names carries two IP addresses: ns1.ignum.com points to 185.65.223.35 and 2a00:1e40:a:53::5, and ns2.ignum.cz points to 217.31.48.201 and 2001:1ab0:7e1e:2::5.
Mail Servers
obschool.cz has two mail servers: mail2.ignum.cz and mail8.ignum.cz.
obschool.cz shares the same mail server setup as other domains, including funus.cz, 0s.cz, topoly.cz and two others.
obschool.cz shares mail servers — at least in part — with other domains, including cizek.net, tsaousidis.eu, originalgroup.cz and two others.
These mail servers are frequently used alongside mail servers mail11.ignum.cz, mail5.ignum.cz, mail12.ignum.cz and 7 other.
mail2.ignum.cz → 62.109.128.119 and mail8.ignum.cz → 62.109.151.89: one IP number per host name.