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

COCKEYSVL prefixes in area code 443

NANPA records 14 assigned NXX blocks to rate center COCKEYSVL in area code 443, 1.8% 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. 8 holders hold those blocks, the largest being PAETEC ITEL, LLC (5), VERIZON MARYLAND, INC. (2), TELEPORT COMMUNICATIONS AMERICA, LLC - MD (2). The earliest assignment on record here is 2001-05-10 and the most recent 2004-04-20. 12 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.

14 assigned blocks – 1.8% of 443
8 holders of record
12 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
443-281 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
443-318 Windstream PAETEC ITEL, LLC – yes yes
443-330 Windstream PAETEC ITEL, LLC – yes yes
443-353 Verizon VERIZON MARYLAND, INC. 2004-03-19 yes yes
443-391 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-428 CORE COMMUNICATIONS, INC.- MD – no yes
443-541 Windstream PAETEC ITEL, LLC – yes yes
443-556 Verizon VERIZON MARYLAND, INC. – no yes
443-578 XO MARYLAND, LLC – yes yes
443-589 Windstream PAETEC ITEL, LLC – yes yes
443-689 Windstream PAETEC ITEL, LLC 2001-05-10 yes yes
443-705 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD – yes yes
443-886 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MD – yes yes
443-933 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MD 2004-04-20 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
PAETEC ITEL, LLC Windstream 5 35.7%
VERIZON MARYLAND, INC. Verizon 2 14.3%
TELEPORT COMMUNICATIONS AMERICA, LLC - MD AT&T 2 14.3%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 7.1%
LEVEL 3 COMMUNICATIONS, LLC - MD Lumen 1 7.1%
CORE COMMUNICATIONS, INC.- MD – 1 7.1%
XO MARYLAND, LLC – 1 7.1%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD Verizon 1 7.1%

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 COCKEYSVL in area code 443?

14 blocks: 281, 318, 330, 353, 391, 428, 541, 556, 578, 589, 689, 705 and 2 more, all listed in the table above.

Which carriers have numbers in COCKEYSVL?

PAETEC ITEL, LLC (5 blocks), VERIZON MARYLAND, INC. (2 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - MD (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), LEVEL 3 COMMUNICATIONS, LLC - MD (1 block), 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 COCKEYSVL 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