`teory.cz`

DNSSEC	⚠️ Not signed
A	80.79.31.82^{🇨🇿 MASTER-AS80.79.16.0/20 MASTER-NET-2}
		PTR	`s08.openservis.net`
NS	`ns2.openservis.net` ⭐
		A	81.4.102.117^{🇳🇱 ASN-ROUTELABEL81.4.100.0/22 WeservIT Route Object}
			PTR	`s02.openservis.net`
NS	`ns1.openservis.net`
		A	80.79.31.78^{🇨🇿 MASTER-AS80.79.16.0/20 MASTER-NET-2}
			PTR	`s01.openservis.net`
NS	`ns3.openservis.cz`
		A	95.217.219.245^{🇫🇮 Hetzner95.217.0.0/16 HETZNER-DC}
			PTR	`ns3.openservis.cz`
NS	`ns4.openservis.org`
		A	49.13.148.39^{🇩🇪 Hetzner49.13.0.0/16 HETZNER-DC}
			PTR	`ns4.openservis.org`
MX	`s08.openservis.net` ⭐
		A	80.79.31.82^{🇨🇿 MASTER-AS80.79.16.0/20 MASTER-NET-2}
			PTR	`s08.openservis.net`
TXT	`v=spf1 a mx include:_spf.openservis.net ~all`
TXT	`google-site-verification=IzhykvkJ-u9ugP0uO44v8D0DCKwYsJ2NURMgTio-EOM`
SOA	`ns2.openservis.net`info@openservis.cz serial=1234567890

`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.cz`hostmaster@nic.cz serial=1775954835

Same first word

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DNS History

6 records (6 active, 0 former)

●NSns1.openservis.net2026-03-08 → 2026-04-12 · 2 obs

● 2026-03-08 00:27:14
● 2026-04-12 01:32:20

●NSns2.openservis.net2026-03-08 → 2026-04-12 · 2 obs

● 2026-03-08 00:27:14
● 2026-04-12 01:32:20

●NSns3.openservis.cz2026-03-08 → 2026-04-12 · 2 obs

● 2026-03-08 00:27:14
● 2026-04-12 01:32:20

●NSns4.openservis.org2026-03-08 → 2026-04-12 · 2 obs

● 2026-03-08 00:27:14
● 2026-04-12 01:32:20

●MXs08.openservis.net2026-03-08 → 2026-04-12 · 2 obs

● 2026-03-08 00:27:14
● 2026-04-12 01:32:20

●A80.79.31.822026-03-08 → 2026-04-12 · 2 obs

● 2026-03-08 00:27:14
● 2026-04-12 01:32:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
teory.cz	ns1.openservis.net, ns2.openservis.net, ns3.openservis.cz, ns4.openservis.org	-

✅ Authoritative Response

Server:49.13.148.39

NS records: ns1.openservis.net, ns2.openservis.net, ns3.openservis.cz, ns4.openservis.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for teory.cz (unsigned zone)

⏱️ Timing

Total: 3446ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`80.79.31.82`
NS	4	`ns1.openservis.net, ns2.openservis.net...`
MX	1	`s08.openservis.net (pri: 1)`
TXT	2	`v=spf1 a mx include:_spf.openservis.net , google-site-verification=IzhykvkJ-u9ugP0`
SOA	1	`ns4.openservis.org info.openservis.cz`

Analysis

IP Addresses

teory.cz points to a single IP: 80.79.31.82.

Other host names, for instance rstick.com, uncaria.cz, www.esitocz.cz, mariti.ro and nejodevy.cz share IP numbers with teory.cz.

Name Servers

teory.cz's delegation is handled by four name servers: ns3.openservis.cz, ns1.openservis.net, ns2.openservis.net and ns4.openservis.org.

teory.cz partially shares name servers with other domains; examples include zlepsovak.cz, nanilatky.cz, prodejvlasu.cz, mastna.com and evashop.sk.