MNC (Mobile Network Code)
A Mobile Network Code (MNC) is a three-digit code that identifies a mobile network operator (MNO) within a country or region. MNC is one of the two components of the International Mobile Subscriber Identity (IMSI), which is a unique identifier for mobile subscribers worldwide. The other component is the Mobile Country Code (MCC), which is a three-digit code that identifies the country where the MNO operates.
MNCs are allocated by the International Telecommunication Union (ITU) to each MNO that operates within a country or region. The ITU is a specialized agency of the United Nations that is responsible for the regulation of international telecommunications. MNCs are allocated in blocks of 1000, with the first digit indicating the type of network and the second and third digits indicating the operator.
The first digit of the MNC indicates the type of network. The following table summarizes the meaning of the first digit:
| First digit | Network type |
|---|---|
| 0 | GSM |
| 1 | CDMA |
| 2 | Reserved |
| 3 | LTE |
| 4 | 5G |
| 5-9 | Reserved |
For example, if the MNC of a mobile network operator is 001, it means that the operator uses CDMA technology. If the MNC is 310, it means that the operator uses LTE technology.
The second and third digits of the MNC identify the operator within the network type. For example, in the United States, AT&T's MNC is 410, Verizon's MNC is 310, and T-Mobile's MNC is 260.
MNCs are used in various telecommunications protocols, such as signaling system 7 (SS7), global system for mobile communications (GSM), and long-term evolution (LTE). MNCs are also used in SIM cards, which are small chips that are inserted into mobile devices and contain subscriber information such as the IMSI.
MNCs play a critical role in the operation of mobile networks. They enable the identification of mobile network operators and the routing of calls and messages between networks. MNCs are also used in network monitoring and management, billing, and regulatory reporting.
In addition to the allocation of MNCs, the ITU also maintains a registry of MNCs and MCCs. The registry is updated regularly to reflect changes in the allocation of MNCs and MCCs. MNOs can request new MNCs or changes to their existing MNCs through the ITU.
In conclusion, a Mobile Network Code (MNC) is a three-digit code that identifies a mobile network operator (MNO) within a country or region. MNCs are allocated by the International Telecommunication Union (ITU) to each MNO that operates within a country or region. MNCs play a critical role in the operation of mobile networks, enabling the identification of mobile network operators and the routing of calls and messages between networks. MNCs are also used in network monitoring and management, billing, and regulatory reporting.