MEID stands for Mobile Equipment Identifier and is a unique identifier for a mobile device. MEID is a form of ESN (Electronic Serial Number).

ESN numbers can have several formats, including an IMEI and MEID.

MEID numbers also have multiple formats, MEID HEX and MEID DEC. The HEX value is a mix of letters and numbers and the DEC value is all numbers.

Swappa generally uses and asks for the MEID HEX, which looks something like this: A1000017F1000D

Check your ESN / MEID number here using Swappa's free ESN Check service...

WikiPedia article for MEID: