A Russian почтовый индекс (postal index) is the 6-digit code used to route mail and parcels across the Russian Federation. The first three digits map to a regional sorting hub — usually a federal subject — and the last three identify the specific delivery office. This free tool validates the format and maps the prefix to a region in your browser.
How it works
- Strip whitespace; the input must be exactly six digits.
- Reject
000000, which is not an assigned index. - Read the first three digits and look them up in a prefix table of federal subjects:
101–135→ Moscow city,190–199→ St. Petersburg,420–429→ Tatarstan (Kazan),690–699→ Primorsky Krai (Vladivostok).
Example
Validate 101000 (central Moscow): six digits, prefix 101 → Moscow city. Validate 190000 (St. Petersburg): prefix 190 → St. Petersburg. Validate 690000 (Vladivostok): prefix 690 → Primorsky Krai.
Notes
The federal-subject mapping is a heuristic based on the first three digits, so it returns the region or sorting hub rather than the exact town, and the lookup table covers the most common prefixes rather than every one of Russia’s 80-plus subjects. A valid six-digit format does not guarantee the specific index is assigned. Confirm against Pochta Rossii’s official directory when delivery accuracy matters. Everything runs locally in your browser.