`o2hosting.cz`

DNSSEC	⚠️ Not signed
NS	`dns.iol.cz` ⭐
		A	2a00:1028:100:102::61^{🇨🇿 O2-CZECH-REPUBLIC2a00:1028::/32 O2 CZ}
			PTR	`dns.iol.cz`
		A	194.228.2.61^{🇨🇿 O2-CZECH-REPUBLIC194.228.0.0/17 CZ.CZNET}
			PTR	`dns.iol.cz`
NS	`ns2.tel.cz`
		A	2a00:1028:1:205::2^{🇨🇿 O2-CZECH-REPUBLIC2a00:1028::/32 O2 CZ}
			PTR	`ns2.tel.cz`
		A	194.228.2.1^{🇨🇿 O2-CZECH-REPUBLIC194.228.0.0/17 CZ.CZNET}
			PTR	`ns2.tel.cz`
SOA	`dns.iol.cz`hostmaster@iol.cz 2020-04-26 #44

`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=1776145634

Same first word

o2hosting.cz

o2hosting.sk

Similar names

hostin2go.nl

DNS History

8 records (2 active, 6 former)

●NSdns.iol.cz2015-07-24 → 2026-04-14 · 2 obs

● 2015-07-24 16:58:42
● 2026-04-14 06:17:12

●NSns2.tel.cz2015-07-24 → 2026-04-14 · 2 obs

● 2015-07-24 16:58:42
● 2026-04-14 06:17:12

○MXsmtp-in.iol.cz2016-05-24 → 2016-12-12 · 5 obs

○ 2016-05-07 18:03:34
● 2016-05-24 09:05:08
● 2016-12-12 08:57:34
○ 2026-03-18 02:16:50
○ 2026-04-14 06:17:12

○MXsmtp-in1.iol.cz2016-02-11 → 2016-05-07 · 5 obs

○ 2015-11-26 06:20:16
● 2016-02-11 18:45:40
● 2016-05-07 18:03:34
○ 2016-05-24 09:05:08
○ 2026-04-14 06:17:12

○MXsmtp-in1.o2mail.cz2015-07-24 → 2015-11-26 · 4 obs

● 2015-07-24 16:58:42
● 2015-11-26 06:20:16
○ 2016-02-11 18:45:40
○ 2026-04-14 06:17:12

○MXsmtp-in2.iol.cz2016-02-11 → 2016-05-07 · 5 obs

○ 2015-11-26 06:20:16
● 2016-02-11 18:45:40
● 2016-05-07 18:03:34
○ 2016-05-24 09:05:08
○ 2026-04-14 06:17:12

○MXsmtp-in2.o2mail.cz2015-07-24 → 2015-11-26 · 4 obs

● 2015-07-24 16:58:42
● 2015-11-26 06:20:16
○ 2016-02-11 18:45:40
○ 2026-04-14 06:17:12

○A194.228.62.252015-07-24 → 2016-05-24 · 4 obs

● 2015-07-24 16:58:42
● 2016-05-24 09:05:08
○ 2016-12-12 08:57:34
○ 2026-04-14 06:17:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz	-
o2hosting.cz	dns.iol.cz, ns2.tel.cz	4 records

✅ Authoritative Response

Server:194.228.2.61

NS records: dns.iol.cz, ns2.tel.cz

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for o2hosting.cz (unsigned zone)

⏱️ Timing

Total: 1040ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`dns.iol.cz, ns2.tel.cz`
SOA	1	`dns.iol.cz hostmaster.iol.cz`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (dns.iol.cz, dns.iol.cz, ns2.tel.cz...)

Analysis

Name Servers

o2hosting.cz is delegated to two name servers: dns.iol.cz and ns2.tel.cz.

o2hosting.cz uses the same name server setup as other domains, for instance rch.o2.cz, 19.208.83.in-addr.arpa, 31.178.90.in-addr.arpa, 148.218.160.in-addr.arpa and 228.228.194.in-addr.arpa.

o2hosting.cz partially shares name servers with other domains, for instance 13.84.193.in-addr.arpa.

Host names with two IP numbers:

The host dns.iol.cz points to 2a00:1028:100:102::61 and 194.228.2.61.

The host ns2.tel.cz points to 2a00:1028:1:205::2 and 194.228.2.1.

o2hosting.cz - robtex.com

o2hosting.cz

cz