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

BULLS GAP prefixes in area code 423

NANPA records 9 assigned NXX blocks to rate center BULLS GAP in area code 423, 1.2% of the 764 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 BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (2), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN (2), ONVOY, LLC - TN (1). The earliest assignment on record here is 2002-05-09 and the most recent 2005-02-03. 8 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

9 assigned blocks – 1.2% of 423
7 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
423-235 AT&T BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL – yes yes
423-327 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN – yes yes
423-373 Onvoy ONVOY, LLC - TN – yes yes
423-393 Charter CHARTER IP ENABLED SERVICES, LLC – yes yes
423-409 Spok SPOK, INC. – no yes
423-523 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 2002-05-09 yes yes
423-537 Windstream PAETEC ITEL, LLC – yes yes
423-546 Lumen LEVEL 3 COMMUNICATIONS, LLC - TN 2002-08-20 yes yes
423-601 AT&T BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 2005-02-03 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
BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL AT&T 2 22.2%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN Verizon 2 22.2%
ONVOY, LLC - TN Onvoy 1 11.1%
CHARTER IP ENABLED SERVICES, LLC Charter 1 11.1%
SPOK, INC. Spok 1 11.1%
PAETEC ITEL, LLC Windstream 1 11.1%
LEVEL 3 COMMUNICATIONS, LLC - TN Lumen 1 11.1%

Frequently asked

Which prefixes belong to BULLS GAP in area code 423?

9 blocks: 235, 327, 373, 393, 409, 523, 537, 546, 601. The table above gives the holder of each.

Which carriers have numbers in BULLS GAP?

BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN (2 blocks), ONVOY, LLC - TN (1 block), CHARTER IP ENABLED SERVICES, LLC (1 block), SPOK, INC. (1 block), PAETEC ITEL, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is BULLS GAP 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 423

All 764 prefixes in 423