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

BEL AIR prefixes in area code 443

NANPA records 19 assigned NXX blocks to rate center BEL AIR in area code 443, 2.4% of the 785 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. 7 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - MD (4), OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (4), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (4). The earliest assignment on record here is 2001-04-20 and the most recent 2015-01-21. 18 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 410, 667 – overlay codes cover the same geography, so a rate center is served by all of them.

19 assigned blocks – 2.4% of 443
7 holders of record
18 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
443-307 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-356 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-369 CORE COMMUNICATIONS, INC.- MD – no yes
443-371 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-528 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC – yes yes
443-567 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-616 Windstream PAETEC ITEL, LLC – yes yes
443-619 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 2009-06-05 yes yes
443-640 Windstream PAETEC ITEL, LLC 2001-05-18 yes yes
443-643 Verizon VERIZON MARYLAND, INC. – yes yes
443-655 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – yes yes
443-752 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 2001-10-17 yes yes
443-787 Windstream PAETEC ITEL, LLC – yes yes
443-819 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2015-01-21 yes yes
443-866 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2002-07-02 yes yes
443-876 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC – yes yes
443-903 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 2011-09-07 yes yes
443-910 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2001-04-20 yes yes
443-987 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD – 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
LEVEL 3 COMMUNICATIONS, LLC - MD Lumen 4 21.1%
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC T-Mobile 4 21.1%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD Verizon 4 21.1%
PAETEC ITEL, LLC Windstream 3 15.8%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 2 10.5%
CORE COMMUNICATIONS, INC.- MD – 1 5.3%
VERIZON MARYLAND, INC. Verizon 1 5.3%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to BEL AIR in area code 443?

19 blocks: 307, 356, 369, 371, 528, 567, 616, 619, 640, 643, 655, 752 and 7 more, all listed in the table above.

Which carriers have numbers in BEL AIR?

LEVEL 3 COMMUNICATIONS, LLC - MD (4 blocks), OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (4 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (4 blocks), PAETEC ITEL, LLC (3 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (2 blocks), CORE COMMUNICATIONS, INC.- MD (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is BEL AIR 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 443

All 785 prefixes in 443