Block identifier. The entire group of 10,000 numbers or a specific group of 1,000 numbers within the NPA NXX.
Carrier Identification Code.
Competitive Local Exchange Carrier
Full Mobile Number Portability.
Local Access and Transport Area. Represents an area within which a carrier is permitted to offer exchange telecommunications and exchange access services.
Local Exchange Carrier.
Local Number Portability
Top 100 Metropolitan Statistical Areas. A MSA is one or more adjacent counties or county equivalents that have at least one urban core area of at least 50,000 population.
North American Numbering Plan.
Numbering Plan Area (Area Code)
The format of a central office code (N=2-9, X=0-9), digits 4-6 of a 10 digit NANP phone number. Also known as an exchange or prefix.
Operating Company Number.
A method of reallocating telephony numbering space in the North American Numbering Plan. Specifically, allowing the 10,000 numbers in a NXX exchange to be subdivided into smaller blocks 1000.
Public Switched Telephone Network.
Rate Center. Identifies a telephone local exchange (NPANXX) service area.
Service Provider, i.e., the telco carrier.