`o2extra.cz`

DNSSEC	⚠️ Not signed
A	160.218.161.157^{🇨🇿 O2-CZECH-REPUBLIC160.218.0.0/16 Route object of Eurotel Praha}
		PTR	`160-218-161-157.rea.o2.cz`
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 2018-08-03 #2

`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=1776133052

WOT: SAFE (79/100)

Subdomains

www.o2extra.cz

Same first word

o2extra.com

o2extra.eu

o2extra.sk

o2extra.cz

DNS History

8 records (3 active, 5 former)

●NSdns.iol.cz2015-08-30 → 2026-04-14 · 2 obs

● 2015-08-30 23:13:48
● 2026-04-14 02:40:46

●NSns2.tel.cz2015-08-30 → 2026-04-14 · 2 obs

● 2015-08-30 23:13:48
● 2026-04-14 02:40:46

○MXsmtp-in.iol.cz2015-08-30 → 2017-10-18 · 8 obs

● 2015-08-30 23:13:48
● 2015-10-25 01:47:54
○ 2015-10-31 20:14:16
○ 2016-05-17 08:07:04
● 2016-05-31 06:18:16
● 2017-10-18 11:09:16
○ 2026-04-04 09:12:06
○ 2026-04-14 02:40:46

○MXsmtp-in1.iol.cz2015-10-31 → 2016-05-17 · 5 obs

○ 2015-10-25 01:47:54
● 2015-10-31 20:14:16
● 2016-05-17 08:07:04
○ 2016-05-31 06:18:16
○ 2026-04-14 02:40:46

○MXsmtp-in2.iol.cz2015-10-31 → 2016-05-17 · 5 obs

○ 2015-10-25 01:47:54
● 2015-10-31 20:14:16
● 2016-05-17 08:07:04
○ 2016-05-31 06:18:16
○ 2026-04-14 02:40:46

●A160.218.161.1572026-04-04 → 2026-04-14 · 3 obs

○ 2017-10-18 11:09:16
● 2026-04-04 09:12:06
● 2026-04-14 02:40:46

○A160.218.161.1652017-10-18 → 2017-10-18 · 4 obs

○ 2017-09-07 11:25:34
● 2017-10-18 11:09:16
○ 2026-04-04 09:12:06
○ 2026-04-14 02:40:46

○A160.218.161.372015-08-30 → 2017-09-07 · 4 obs

● 2015-08-30 23:13:48
● 2017-09-07 11:25:34
○ 2017-10-18 11:09:16
○ 2026-04-14 02:40:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz	-
o2extra.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 o2extra.cz (unsigned zone)

⏱️ Timing

Total: 883ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`160.218.161.157`
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, ns2.tel.cz, dns.iol.cz...)

Analysis

Hierarchy

The parent of www.o2extra.cz is o2extra.cz.

IP Addresses

o2extra.cz points to a single IP address: 160.218.161.157.

Other host names such as o2extrapark.com, o2extrapark.cz, o2extravyhody.com, o2extra.com and o2extra.eu share IPs with o2extra.cz.

Name Servers

Two name servers dns.iol.cz and ns2.tel.cz handle the delegation for o2extra.cz.

o2extra.cz shares the same name server setup as other domains, for example 176.188.37.in-addr.arpa, 62.188.80.in-addr.arpa, 254.80.109.in-addr.arpa, 13.228.194.in-addr.arpa and 197.208.83.in-addr.arpa.

Host names with two IP numbers:

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

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

o2extra.cz - robtex.com

o2extra.cz

cz