Czechia PSČ validator
How the PSČ format works
- Format
- 5 digits, conventionally written as 3 digits + 2 digits
- Example
- 11000
Things to watch for
- Format-only check — does not confirm the PSČ actually exists
- Always exactly 5 digits; the customary space after the 3rd digit (e.g. 110 00) is stripped before this validator checks it
- Inherited unchanged from the 1973 Czechoslovak numbering system at the 1993 split
^[0-9]{5}$A Czech PSČ is the 5-digit postcode Česká pošta uses to route mail, written as three digits, a space, then two more — for example 110 00 for Praha 1, the central district of Prague. The numbering dates to 1973 under Czechoslovakia; when the country split in 1993, the Czech Republic simply kept using its share of the original block rather than renumbering. Anyone validating a Czech shipping address, a checkout form, or a spreadsheet of customer records needs the PSČ in the correct 5-digit shape before it’s trusted.
Because the space sits in a fixed spot — after the third digit — a code that’s missing it, or has digits shifted across that boundary, produces a string that clearly doesn’t match the expected shape, well before anyone checks whether it’s actually in use.
How this validator works
This tool checks that the input is exactly 5 digits, accepted with or without the customary space after the third digit, entirely in your browser, with nothing sent to a server.
What a pass doesn’t tell you
A PSČ carries no check digit, so matching the 5-digit shape is the most a client-side tool can confirm — not that Česká pošta has assigned it to a real post office or street. Confirming that requires Česká pošta’s own postcode lookup.
Scope: this page and tool cover format validation only — not address lookup or confirming a PSČ is currently in use.
PSČ FAQ
What does PSČ stand for?
PSČ is short for poštovní směrovací číslo, literally 'postal routing number' — a 5-digit code written as three digits, a space, then two more, e.g. 110 00 for Praha 1 (central Prague).
When was the PSČ system introduced?
In 1973, under Czechoslovakia. When the country split into the Czech Republic and Slovakia in 1993, each half kept its share of the original numbering block unchanged rather than starting a new system — so today's Czech PSČ still traces directly back to codes assigned before independence.
Does a correctly formatted PSČ mean it actually exists?
No. This tool only confirms the string is 5 digits in the right shape — it doesn't check it against Česká pošta's actual assignment list. Confirming a PSČ is real, and seeing which post office it covers, requires Česká pošta's own postcode lookup.