MSISDN decoder
Paste a number in any format — with +, with 00, with spaces or dashes — and we normalize it to the international E.164 format: country calling code identified and national number split out. Handy for cleaning MSISDN lists before an integration or a platform migration.
What an MSISDN is, and what E.164 is
The MSISDN (Mobile Station International Subscriber Directory Number) is a mobile line's phone number — what you'd dial to call it. ITU-T recommendation E.164 defines its international format: at most 15 digits, composed of the country calling code (1–3 digits) and the national significant number. Don't confuse MSISDN with IMSI: the IMSI identifies the subscriber inside the network and travels in signalling; the MSISDN is the line's public number, and a SIM can have several — or, like many data-only IoT SIMs, none routable for voice. In IoT integrations, strict E.164 (with + and no spaces) is what almost every API expects, including ours.