The Czech register of allocated telephone numbers and codes, kept by the Czech Telecommunication Office. Allocation is an individual right granted to an undertaking, which is a different legal act from the notification that puts an undertaking on the operator register, and the database can show the full history of holders of a given number.
Domain Rating is a dated Ahrefs snapshot of domain authority. PetroHrys Score is an independent editorial assessment of the directory’s practical business value. They are separate measurements and are never combined. Domain Rating values are dated historical Ahrefs snapshots. Domain Rating is a dated historical measurement of the shared domain, not an assessment of this individual registry page. New measurements are not collected because the Research Center does not depend on mandatory authenticated APIs. Where several registries are published on one measured domain they repeat that domain’s single dated snapshot rather than each carrying a figure of its own. Domain Rating is a third-party metric produced by their respective providers, not by PetroHrys.com. Each recorded value carries its provider and the date it was measured, and describes the domain that was measured rather than one page on it. No source has been consulted for authority score, estimated traffic and referring domains, so they are not published for any record.
Partly open The database was served anonymously with no credential, offering search by a whole number, by leading digits, by reference number, by undertaking and by the history of a number, with the full list of undertakings rendered in the selector. Login is therefore recorded as not required. No query was executed, so result content and any limits were not observed and stay null.
Official name
Přidělená čísla a kódy
English title
Editorial translation
Hosting
This registry is a distinct system hosted on the shared ctu.gov.cz platform.
Assessment
Strengths
It exposes the history of a number, showing all past holders of the right to use it, which few numbering registers publish.
It can be searched from either direction — from a number to its holder, or from an undertaking to the numbers allocated to it.
It accepts partial numbers, so a reader can work from leading digits rather than needing an exact range.
Limitations
Allocation is a right of use granted to an undertaking. It does not establish that the undertaking is currently providing service on those numbers.
Because numbers are portable, the holder of an allocation is not necessarily the provider serving a particular subscriber on that number.
Being recorded here proves nothing about spectrum or numbering. Notification as an operator, an individual spectrum authorisation and an allocation of numbers are three separate legal acts kept in three separate systems. This database covers only numbers and codes.
Absence of a number from an allocation does not establish that it is invalid or unassigned; it establishes that it is not covered by an allocation recorded here.
No query was executed during verification, so result content and any limits were not observed and none is asserted.
Submission guidance
Records are created through incorporation, registration, filing, or statutory processes.
Submission difficulty
Unknown
Typical listing quality
High
Typical approval time
Unknown
Review process
Unknown
Best for
Finding which undertaking holds an allocation covering a given Czech number range.
Tracing the historical holders of a number allocation over time.
Not recommended for
Identifying the retail provider of a specific subscriber line. Allocation is not the same as who serves the end customer, because numbers can be ported.
Inferring anything about spectrum or about a provider’s operator status from a number allocation.
Preparation checklist
No checklist recorded yet.
Common mistakes
No common mistakes recorded yet.
Establishing required submission assets requires submitting a listing and observing the result. That has not been done for any directory in this dataset, so it is not published rather than estimated.
What this directory accepts
Startups
Unknown
SaaS products
Unknown
Enterprises
Yes
Agencies
Unknown
Freelancers
Unknown
Local businesses
Yes
Developer tools
Unknown
Open-source projects
Unknown
Non-profits
Unknown
AI products
Unknown
Mobile apps
Unknown
Ecommerce stores
Unknown
Recommended industries
telecommunications
technology
How the PetroHrys Score was reached
Editorial trust 15%
10 / 10How far the entries a directory publishes can be relied on as accurate.
Business usefulness 15%
8 / 10How much practical use a listing there is to the business being listed.
Verification quality 12%
9 / 10How thoroughly the directory establishes that an entry is genuine before publishing it.
Platform reputation 10%
8 / 10How the platform is regarded in its field. Deliberately not a popularity, traffic or recognition measure.
Spam resistance 10%
10 / 10How well the directory keeps low-quality and promotional entries out.
Industry importance 10%
8 / 10How central the directory is to its sector, independently of how useful one listing is.
Long-term stability 10%
9 / 10How likely the directory is to still exist, and to still carry the entry, years from now.
Submission quality 8%
6 / 10What the submission process asks for and how workable it is for the business submitting.
Transparency 5%
9 / 10How openly the directory states its rules, costs and criteria.
Moderation quality 5%
9 / 10How the directory maintains entries after publication.
The PetroHrys Score is a first-party editorial assessment, not a third-party
authority metric. It is the weighted sum of the ten factors above, divided by ten, so the number
on this page is reproducible from the values shown. Each factor is scored from 0 to 10 by a human reviewer and weighted as shown. The definitions describe what was weighed, not a rubric: no threshold or formula maps a directory onto a value, and two reviewers could reach different numbers. The score is reproducible from the factors shown on every record, but it is an editorial judgement, not a measurement.