Verifying against the live site and live WHOIS/DNS…
Common questions
Is cra.cz legit or a scam?
cra.cz was registered Jun 7, 1997 (29 years old), per public registration records. AboutUs doesn't label sites "legit" or "a scam": this page lists the dated registration, DNS, HTTPS, mail-authentication and safety checks we could verify, each with its source, so you can decide for yourself.
Who owns cra.cz?
Nobody has completed AboutUs's owner verification for cra.cz. That's true of most sites here — it isn't itself a warning sign.
When was cra.cz registered?
cra.cz's registration dates to Jun 7, 1997 (29 years old), per public registration records. INTERNET CZ, a.s. is the registrar on record today.
Correct a description, link or other detail. Submissions are reviewed before publication.
Registered 1997 · site is live · HTTPS valid
Cra.cz
Radiokomunikace a.s. is a Czech telecommunications operator providing internet, voice, and wireless connectivity services to residential customers. Based in Prague, it operates as an alternative telecom provider in the Czech market.
Authority 87/100— ahead of 87% of the August 2026 scored sampleClear
Why this authority score
87 is a percentile: higher than 87% of sites we score.
How it's calculated
Prominence (Tranco rank #6,259)+9
Verified continuity: 29.4 years (RDAP registration)+11
Security & email hygiene+5
Calibration adjustment (published map)+19
Model score: 44/99 — what these reason lines add up to.
Published Authority (percentile): 87/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
Safety evidence
Retained threat-feed result (recorded about 1 days ago); name-similarity check available (recorded about 1 days ago); 3/3 transport and email checks available (oldest recorded about 1 days ago). This is evidence coverage, not a probability that a website is safe.
What cra.cz said about itself, 2007
Quoted from the site's AboutUs wiki page in each year it changed (1 version). These are the page's own words at the time, not AboutUs's assessment. New words · dropped words
2007
RADIOKOMUNIKACE a.s. jsou největším alternativním telekomunikačním operátorem a jedničkou na trhu vysílacích služeb.
Site history
Dated record — historical facts always carry their date.
1997
Domain registered (Jun 7, 1997).
2007
First tracked by AboutUs (Nov 3, 2007); profile edited 2 times through 2013.
✓ domain continuity 29 years registered✓ live verified Oct 27, 2026
No caution flags in the available scoring observations; this is not a complete safety assessment
Lifeline · cra.cz over time
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 29 years ago · on AboutUs since 2007 · 1 registrar change since May 27, 2009 · no ownership change on record since 2009 · last checked Oct 25, 2026.
Registration
RegisteredJun 7, 1997cra.cz was registered on Jun 7, 1997.Source: RDAP, fetched Oct 25, 2026
AboutUs record
AboutUs wiki pageAboutUs wiki pageNov 3, 2007 – Nov 15, 2013An AboutUs wiki page described cra.cz from Nov 3, 2007 to Nov 15, 2013 (2 edits).Source: AboutUs wiki archive, 2006–2023Said about itself in 2007Jul 1, 2007
Registrar
REG-INTERNET-CZREG-INTERNET-CZMay 27, 2009 – Jun 21, 2026Registrar REG-INTERNET-CZ in the WHOIS and RDAP records held for cra.cz, from May 27, 2009 to Jun 21, 2026.Source: WHOIS / RDAP archive (who.is)
Ownership
Ownership recordsMay 27, 2009 – Jun 21, 2026Registration records for cra.cz are held from May 27, 2009 to Jun 21, 2026 (53 records). None shows a change of registrant. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
No ownership changes recorded, 2009–2026
Zone file
No nameserver records held, Apr 2014 – Jun 2018Nameservers: bluetone.cz, cra.czNameservers: bluetone.cz, cra.czMay 27, 2009 – Apr 25, 2014Registration records listed bluetone.cz, cra.cz nameservers (ns.bluetone.cz, ns.cra.cz, ns1.bluetone.cz) for cra.cz from May 27, 2009 to Apr 25, 2014.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
Google Trust ServicesSep 7, 2026 – Oct 27, 2026Google Trust Services issued 43 certificates for cra.cz from Sep 7, 2026, the latest valid until Jan 24, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)Let's EncryptSep 13, 2026 – Oct 27, 2026
200020102020Jan ’26Oct ’26← last 12 months, drawn wider
Every dated fact on this lifeline (14)
Jun 7, 1997Registration: cra.cz was registered on Jun 7, 1997.Source: RDAP, fetched Oct 25, 2026
Jul 1, 2007AboutUs record: “RADIOKOMUNIKACE a.s. jsou největším alternativním telekomunikačním operátorem a jedničkou na trhu vysílacích služeb.”Source: AboutUs wiki archive, 2007
Nov 3, 2007 – Nov 15, 2013AboutUs record: An AboutUs wiki page described cra.cz from Nov 3, 2007 to Nov 15, 2013 (2 edits).Source: AboutUs wiki archive, 2006–2023
May 27, 2009 – Jun 21, 2026Registrar: Registrar REG-INTERNET-CZ in the WHOIS and RDAP records held for cra.cz, from May 27, 2009 to Jun 21, 2026.Source: WHOIS / RDAP archive (who.is)
May 27, 2009 – Jun 21, 2026Ownership: Registration records for cra.cz are held from May 27, 2009 to Jun 21, 2026 (53 records). None shows a change of registrant. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
May 27, 2009 – Apr 25, 2014Zone file: Registration records listed bluetone.cz, cra.cz nameservers (ns.bluetone.cz, ns.cra.cz, ns1.bluetone.cz) for cra.cz from May 27, 2009 to Apr 25, 2014.
“RADIOKOMUNIKACE a.s. jsou největším alternativním telekomunikačním operátorem a jedničkou na trhu vysílacích služeb.”
Source: AboutUs wiki archive, 2007
Current AboutUs recordJul 4, 2026 – Oct 25, 2026 (latest)Authority and Safety last refreshed Oct 25, 2026.Source: AboutUs checks
INTERNET CZ, a.s.
Oct 25, 2026
Registrar INTERNET CZ, a.s. in the registration data recorded on Oct 25, 2026.
Source: RDAP, fetched Oct 25, 2026
Nameservers: bluetone.cz
Nameservers: bluetone.czJun 30, 2018 – Jun 21, 2026Registration records listed bluetone.cz nameservers (ns.bluetone.cz, ns1.bluetone.cz, ns2.bluetone.cz) for cra.cz from Jun 30, 2018 to Jun 21, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
DNS moved to bluetone.czJun 30, 2018cra.cz's nameservers moved from bluetone.cz, cra.cz to bluetone.cz at some point between Apr 25, 2014 and Jun 30, 2018. Last seen at bluetone.cz, cra.cz: Apr 25, 2014 (registration record). First seen at bluetone.cz: Jun 30, 2018 (registration record). AboutUs holds no nameserver records for the about 4 years in between, so the date of the move is not known more closely.Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Let's Encrypt issued 117 certificates for cra.cz from Sep 13, 2026, the latest valid until Jan 24, 2027.
Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
SSL CorporationSep 17, 2026 – Oct 27, 2026SSL Corporation issued 1 certificate for cra.cz from Sep 17, 2026, the latest valid until Apr 3, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Certificate from Google Trust ServicesOct 1, 2026 – Oct 25, 2026 (latest)Google Trust Services certificate valid Oct 1, 2026 to Dec 30, 2026, as seen on Oct 25, 2026.Source: TLS check, Oct 25, 2026
Source: From registration records (WHOIS / RDAP archive, who.is)
Jun 30, 2018 – Jun 21, 2026Zone file: Registration records listed bluetone.cz nameservers (ns.bluetone.cz, ns1.bluetone.cz, ns2.bluetone.cz) for cra.cz from Jun 30, 2018 to Jun 21, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Jun 30, 2018Zone file: cra.cz's nameservers moved from bluetone.cz, cra.cz to bluetone.cz at some point between Apr 25, 2014 and Jun 30, 2018. Last seen at bluetone.cz, cra.cz: Apr 25, 2014 (registration record). First seen at bluetone.cz: Jun 30, 2018 (registration record). AboutUs holds no nameserver records for the about 4 years in between, so the date of the move is not known more closely.Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Jul 4, 2026 – Oct 25, 2026AboutUs record: Authority and Safety last refreshed Oct 25, 2026.Source: AboutUs checks
Sep 7, 2026 – Oct 27, 2026Certificate: Google Trust Services issued 43 certificates for cra.cz from Sep 7, 2026, the latest valid until Jan 24, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Sep 13, 2026 – Oct 27, 2026Certificate: Let's Encrypt issued 117 certificates for cra.cz from Sep 13, 2026, the latest valid until Jan 24, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Sep 17, 2026 – Oct 27, 2026Certificate: SSL Corporation issued 1 certificate for cra.cz from Sep 17, 2026, the latest valid until Apr 3, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Oct 1, 2026 – Oct 25, 2026Certificate: Google Trust Services certificate valid Oct 1, 2026 to Dec 30, 2026, as seen on Oct 25, 2026.Source: TLS check, Oct 25, 2026
Oct 25, 2026Registrar: Registrar INTERNET CZ, a.s. in the registration data recorded on Oct 25, 2026.Source: RDAP, fetched Oct 25, 2026