Contacts

  • Holder

    SB:CPOST

  • Administrative

    ACTIVE24-PVEC389165

  • Administrative

    ADMK-P-CPOST

  • Registrar

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

    Sokolovská 394/17
    Praha 8
    186 00
    CZ

    +420.234262000

Website

Answer
200 OKin 308 ms
Ends at
https://www.postsignum.cz//
Redirects
  • https://postsignum.cz/ (302)
Title
Certifika�n� autorita, kvalifikovan� certifik�t, kvalifikovan� �asov� raz�tko, Bezpe�n� kl��, USB token | Certifika�n� autorita PostSignum
Server
Apache
Protocols
HTTP/2
Certificate
DigiCert Inc (GeoTrust EV RSA CA G2) for www.postsignum.cz, rse.postsignum.eu, rse.postsignum.cz, rse.postsignum.cms2.cz, certifikatonline.cz and postsignum.cms2.cz, valid until
www
Answers itself (200 OK)

DNS records

postsignum.cz

A
TTL 1 hour
NS
TTL 1 day
TXT
  • PS-AC3E7B007D7AB0BA379FAA8AB62D9DA35C5444F4
  • n6p1lhvx0jr81pdsndzk3125xfsqb3z7
  • v=spf1 -all
TTL 1 hour
SOA
  • Primary server
    dns1.cpost.cz
    Contact
    root@cpost.cz
    Serial
    2026102201
    Refresh
    4 hours
    Retry
    1 hour
    Expire
    7 days
    Negative TTL
    1 hour
TTL 1 hour
CAA
TTL 1 hour

www.postsignum.cz

A
TTL 1 hour

_dmarc.postsignum.cz

TXT
  • v=DMARC1; p=reject; rua=mailto:report.dmarc@cpost.cz; ruf=mailto:forensis.dmarc@cpost.cz; adkim=s; aspf=s; fo=0;
TTL 1 hour

As dns3.cpost.cz answers them

Reputation

Domain blocklists

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

Rankings

170,615 Tranco rank up from 171,468 on 2026-09-21
7.07Open PageRank, out of 10
44,180Open PageRank position
356Referring domains

From Tranco and Open PageRank

DNSSEC

Every link from the root to postsignum.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

postsignum.cz Verified

  • Found 1 DS records for postsignum.cz in the cz zone
  • DS=3462/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 postsignum.cz
  • DS=3462/SHA-256 verifies DNSKEY=3462/SEP
  • Found 2 RRSIGs over DNSKEY RRset
  • RRSIG=3462 and DNSKEY=3462/SEP verifies the DNSKEY RRset
  • RRSIG=48164 over the DNSKEY RRset was made with a key that is not trusted here
  • Found 1 RRSIGs over SOA RRset
  • RRSIG=48164 and DNSKEY=48164 verifies the SOA RRset