Guides
Two short explainers on what the digits and letters in these codes mean, written from the publishers' own descriptions. Each one lists its sources at the end.
How a six-digit pincode is built
The nine PIN regions, what the first two and three digits narrow down, and why one pincode can list several post offices.
How IFSC and MICR codes are built
The bank code, the fixed zero and the branch code in an IFSC; the city, bank and branch digits in a MICR code; and a checklist before you send money.
Want to see where the search data comes from instead? Read data sources and licence.