Contacts

  • Holder

    REG-WEBSUPPORT-DP-1483262

  • Registrar

    ACTIVE 24, s.r.o. REG-ACTIVE24

    Sokolovská 394/17
    Praha 8
    186 00
    CZ

    +420.234262000

Website

Answer
200 OKin 237 ms
Title
Úvod | OptoNet Communication, spol. s r.o.
Protocols
HTTP/2
Certificate
Let's Encrypt (YR1) for optonet.cz, valid until
www
Answers itself (200 OK)

DNS records

optonet.cz

A
TTL 5 min
MX
TTL 5 min
NS
TTL 1 hour
TXT
  • MS=18A18E25DE1978702C3AFEA8D28F3B09562F5CB1
  • MS=ms35728594
  • google-site-verification=p7Ju7WL8pDY3PfpQiGqDc_EfKmQ179OHnd6k9BZhl_M
  • v=spf1 include:spf.protection.outlook.com a:mx2.optonet.cz ip4:78.156.158.111 -all
TTL 5 min
SOA
TTL 1 day
CAA
None: any certificate authority may issue for this name

www.optonet.cz

CNAME
  • optonet.cz
TTL 10 min
A
TTL 5 min

As ns1.websupport.eu answers them

Reputation

Domain blocklists

  • Spamhaus DBL Not listed
  • SURBL Not listed
  • URIBL Not listed

Rankings

2,063,905 Tranco rank down from 1,903,145 on 2026-09-28
1.46Open PageRank, out of 10
9,566,525Open PageRank position
4Referring domains

From Tranco and Open PageRank

DNSSEC

Every link from the root to optonet.cz verifies.

. Verified

  • Found 3 DNSKEY records for .
  • DS=20326/SHA-256 verifies DNSKEY=20326/SEP
  • DS=38696/SHA-256 verifies DNSKEY=38696/SEP
  • Found 1 RRSIGs over DNSKEY RRset
  • RRSIG=38696 and DNSKEY=38696/SEP verifies the DNSKEY RRset

cz Verified

  • Found 1 DS records for cz in the . zone
  • DS=20237/SHA-256 has algorithm ECDSAP256SHA256
  • Found 1 RRSIGs over DS RRset
  • RRSIG=8763 and DNSKEY=8763 verifies the DS RRset
  • Found 2 DNSKEY records for cz
  • DS=20237/SHA-256 verifies DNSKEY=20237/SEP
  • Found 1 RRSIGs over DNSKEY RRset
  • RRSIG=20237 and DNSKEY=20237/SEP verifies the DNSKEY RRset

optonet.cz Verified

  • Found 1 DS records for optonet.cz in the cz zone
  • DS=30585/SHA-256 has algorithm ECDSAP256SHA256
  • Found 1 RRSIGs over DS RRset
  • RRSIG=20081 and DNSKEY=20081 verifies the DS RRset
  • Found 2 DNSKEY records for optonet.cz
  • DS=30585/SHA-256 verifies DNSKEY=30585/SEP
  • Found 1 RRSIGs over DNSKEY RRset
  • RRSIG=30585 and DNSKEY=30585/SEP verifies the DNSKEY RRset
  • Found 1 RRSIGs over SOA RRset
  • RRSIG=1055 and DNSKEY=1055 verifies the SOA RRset