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 NMS (network management software). Each MIB is identified by an OID (Object Identifier) and is a commonly an integer or string value that defines a network device setting or status.