The Meter Point Reference Number (MPRN) is used to identify the gas supply for your property. It's also known as the ‘supply number’, ‘M number’ or 'endpoint'.
You can find this number in the gas section of your energy bill.
The MPRN has a standard format – it consists of between six and ten numerical digits only.
If you’re asked to confirm this number, check that your MPRN matches your old and new supplier by looking at new and previous bills.