tosu.be — useful little tools
Bank accounts
Checksum-valid BE & NL IBANs; NL bank codes are real. The 11-test is no longer required for NL accounts, so it isn't applied.
Identity numbers
BE rijksregisternummer & NL burgerservicenummer, valid check digits.
VAT number
EU VAT numbers with the country's official check digits.
VIN
Real make code, model-year code and check digit — (probably) not an actual vehicle.
Cryptography
SQL insert
Paste an insert statement from a log file to see which value belongs to which column. Edit the table and the statement is written back — in Oracle, SQL Server, PostgreSQL or MySQL — or start from an empty table and build one from scratch.
Race
Let's see who is the fastest. Add participant names and start the race: first over the finish line wins. Want extra suspense? Set the distance to like a million meters (but not really a million though).