Definition
MCC / MNC
Numeric codes identifying a mobile number's country (MCC) and network operator (MNC).
The Mobile Country Code (MCC) identifies the country, and the Mobile Network Code (MNC) identifies the specific operator within it. Together they pin down which network a mobile number is on.
MCC/MNC are how a lookup expresses the resolved carrier and country in a machine-readable way, including after a number has been ported.