Home sihtnumber Estonia
Estonia Sihtnumber validator
How the sihtnumber format works
- Format
- 5 digits
- Example
- 10111
Things to watch for
- Format-only check — does not confirm the sihtnumber actually exists
- Always exactly 5 digits with no separators
- Introduced in 1993, after independence, replacing the old Soviet-era numbering
^[0-9]{5}$An Estonian sihtnumber is the 5-digit postcode Omniva uses to route mail, written directly before the town name — for example 10111 for Tallinn’s Old Town. The system was introduced in 1993, shortly after independence, replacing the Soviet-era postal numbering that Estonia had used until then. Anyone validating an Estonian shipping address, a checkout form, or a spreadsheet of customer records needs the sihtnumber in the correct 5-digit shape before it’s trusted.
Because it’s a bare run of digits with no separator, a dropped or duplicated digit produces a code that’s still superficially plausible — the kind of error that’s cheap to catch at entry and more costly once mail has already been sorted.
How this validator works
This tool checks that the input is exactly 5 digits with no letters, spaces, or hyphens, entirely in your browser, with nothing sent to a server.
What a pass doesn’t tell you
A sihtnumber carries no check digit, so matching the 5-digit shape is the most a client-side tool can confirm — not that Omniva has assigned it to a real district. Confirming that requires Omniva’s own postcode lookup.
Scope: this page and tool cover format validation only — not address lookup or confirming a sihtnumber is currently in use.
sihtnumber FAQ
What is a sihtnumber and when was it introduced?
Sihtnumber is Estonian for 'target number' — the country's 5-digit postcode, put in place in 1993 after independence, replacing the Soviet-era numbering used previously. It's written directly before the town name, e.g. 10111 Tallinn.
How does Estonia's postcode compare with its Baltic neighbours?
Estonia and Lithuania both use 5-digit codes, while Latvia in between uses a shorter 4-digit code with an LV- prefix. All three replaced Soviet-era numbering after independence, but on different timelines and with different digit counts.
Does a correctly formatted sihtnumber mean it actually exists?
No. This tool only confirms the string is 5 digits — it doesn't check it against Omniva's actual assignment list. Confirming a sihtnumber is real, and seeing which district it names, requires Omniva's own postcode lookup.