MIB may refer to any of the following:
1. With a lowercase "b", Mib is an abbreviation for Mebibit.
2. With an uppercase "B", MiB is an abbreviation for Mebibyte.
3. Short for Management Information Base, MIB is a database of objects that can be monitored by a network management system (NMS). Each MIB is identified by an Object Identifier (OID) and is a commonly an integer or string value that defines a network device setting or status.