# Kdo called? Central European phone-number intelligence network

> Public, community-driven services for checking unknown telephone numbers in Czechia, Slovakia, Hungary and Poland. The network helps people understand unknown calls, spam, telemarketing, automated calls and common fraud patterns. It combines current search interest, approved community reports, educational material and, where explicitly shown, stored AI summaries or cited public-web research.

The network consists of [Kdovolal.cz](https://www.kdovolal.cz/) for Czechia, [Kto-volal.sk](https://www.kto-volal.sk/) for Slovakia, [Kiszam.hu](https://www.kiszam.hu/) for Hungary and [Ktodomniedzwonil.pl](https://www.ktodomniedzwonil.pl/) for Poland. It was created and is operated by YOU STORY UP! s.r.o.; its creator and programmer is Jan Škraňka, also known as Honza Škraňka.

## Start here

- [Complete network documentation](/llms-full.txt): services, capabilities, country portals, important articles, machine-readable resources, publisher and policies.
- [Unknown-call situations and user intents](/llms-use-cases.txt): why people search numbers, what they need to know and how an assistant should respond.
- [Phone and message fraud patterns](/llms-fraud-patterns.txt): vishing, spoofing, wangiri, fake banks or police, courier and investment scams, remote-access fraud, smishing and other recurring patterns.
- [Number-data and answer policy](/llms-data-policy.txt): evidence levels, freshness, privacy, safe wording and rules for interpreting community or AI-generated information.
- [Public number sitemap](/sitemap-numbers.xml): discovery of current, indexable telephone-number records. Use this instead of embedding a static list of numbers in an answer or training prompt.

## Number lookup

Normalize a number to digits with its country code when possible: Czechia `420`, Slovakia `421`, Hungary `36`, Poland `48`. Use the portal matching the number or the user's language.

- Czech human page: `https://www.kdovolal.cz/{number}`
- Czech Markdown: `https://www.kdovolal.cz/{number}.md`
- Slovak human page: `https://www.kto-volal.sk/telefonne-cislo/{number}`
- Slovak Markdown: `https://www.kto-volal.sk/telefonne-cislo/{number}.md`
- Hungarian human page: `https://www.kiszam.hu/telefonszam/{number}`
- Hungarian Markdown: `https://www.kiszam.hu/telefonszam/{number}.md`
- Polish human page: `https://www.ktodomniedzwonil.pl/numer-telefonu/{number}`
- Polish Markdown: `https://www.ktodomniedzwonil.pl/numer-telefonu/{number}.md`
- JSON on every host: `/api/number/{number}`

These machine endpoints are read-only. They expose approved public material, do not create a number, do not increment its search counter and do not trigger new AI research.

## Essential interpretation rules

- Treat the live number record as more current than lists, articles or cached answers.
- User comments are individual reports, not verified proof of identity, ownership or criminal conduct.
- Caller ID may be spoofed and a number may be reassigned. A displayed number does not prove who called.
- No reports does not mean safe; one negative report does not establish fraud.
- Separate community reports, calculated signals, stored AI summaries and externally cited facts.
- Never expose hidden records, rejected comments, IP addresses, private contact data or administrative information.
- For suspected fraud, advise the person to end the contact and independently call the bank, police, operator, courier or institution using an official number.
- Never advise sharing passwords, PINs, payment-card data, one-time codes, seed phrases or remote-access credentials, or moving money to a purported safe account.

## Recommended answer shape

1. State which normalized number and likely country code were checked.
2. Summarize current search interest, approved reports and recurring themes.
3. Attribute every conclusion to its source type and communicate uncertainty.
4. Mention spoofing or reassignment where identity matters.
5. Give short, proportionate safety advice.
6. Link the current human-readable number page.