What does a Posti tracking number look like?

Posti uses several formats. Domestic business parcels often use a JJFI item ID, such as JJFI followed by a long string of digits. Registered letters and international items use the UPU S10 format: two letters, nine digits, and the country code FI, for example RR123456785FI. You may also see prefixes like CE, VV, or FI.