NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

MOSS BEACH prefixes in area code 650

NANPA records 7 assigned NXX blocks to rate center MOSS BEACH in area code 650, 1.0% of the 717 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 5 holders hold those blocks, the largest being MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (2), PACIFIC BELL (2), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1). 7 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

7 assigned blocks – 1% of 650
5 holders of record
7 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
650-263 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA – yes yes
650-535 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS – yes yes
650-563 AT&T PACIFIC BELL – yes yes
650-718 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
650-719 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA – yes yes
650-728 AT&T PACIFIC BELL – yes yes
650-897 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA Verizon 2 28.6%
PACIFIC BELL AT&T 2 28.6%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 1 14.3%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 1 14.3%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 14.3%

Frequently asked

Which prefixes belong to MOSS BEACH in area code 650?

7 blocks: 263, 535, 563, 718, 719, 728, 897. The table above gives the holder of each.

Which carriers have numbers in MOSS BEACH?

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (2 blocks), PACIFIC BELL (2 blocks), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (1 block), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MOSS BEACH a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 650

All 717 prefixes in 650