`o2extra.sk`

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 2016-02-03 #0

`sk`

	DNSSEC	🔒 Signed (DS record present)
	NS	`m.tld.sk` ⭐
	NS	`e.tld.sk`
	NS	`f.tld.sk`
	NS	`g.tld.sk`
	NS	`h.tld.sk`
	SOA	`m.tld.sk`hostmaster@sk-nic.sk serial=2018505410

Same first word

o2extra.eu

o2extra.sk

o2extra.cz

o2extra.com

DNS History

2 records (2 active, 0 former)

●NSdns.iol.cz2015-06-18 → 2026-04-14 · 2 obs

● 2015-06-18 22:22:00
● 2026-04-14 22:50:08

●NSns2.tel.cz2015-06-18 → 2026-04-14 · 2 obs

● 2015-06-18 22:22:00
● 2026-04-14 22:50:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
sk	e.tld.sk, f.tld.sk, g.tld.sk, h.tld.sk	8 records
o2extra.sk	dns.iol.cz, ns2.tel.cz	-

✅ Authoritative Response

Server:194.228.2.1

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for o2extra.sk (unsigned zone)

⏱️ Timing

Total: 1295ms | Queries: -

📄 Records

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

📌 Glue Records Collected

Total: 8

In-bailiwick: 8 (e.tld.sk, e.tld.sk, f.tld.sk...)

Analysis

Name Servers

o2extra.sk's delegation uses two name servers, dns.iol.cz and ns2.tel.cz.

o2extra.sk shares the same name server setup as other domains, for example 138.101.88.in-addr.arpa, 16.71.85.in-addr.arpa, 153.208.83.in-addr.arpa, 113.183.90.in-addr.arpa and 202.243.92.in-addr.arpa.

o2extra.sk at least partially shares name servers with other domains; for instance cz.o2.com.

Host names with two IPs:

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.sk - robtex.com

o2extra.sk

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