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

SIERRABLNC prefixes in area code 915

NANPA records 3 assigned NXX blocks to rate center SIERRABLNC in area code 915, 0.8% of the 367 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. 3 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX (1), ONVOY, LLC - TX (1), VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW (1). The earliest assignment on record here is 2003-02-11 and the most recent 2021-07-06. 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.8% of 915
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
915-205 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 2003-02-11 yes yes
915-278 Onvoy ONVOY, LLC - TX 2021-07-06 yes yes
915-369 Windstream VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW – 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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX Verizon 1 33.3%
ONVOY, LLC - TX Onvoy 1 33.3%
VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW Windstream 1 33.3%

Frequently asked

Which prefixes belong to SIERRABLNC in area code 915?

3 blocks: 205, 278, 369. The table above gives the holder of each.

Which carriers have numbers in SIERRABLNC?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX (1 block), ONVOY, LLC - TX (1 block), VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SIERRABLNC 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 915

All 367 prefixes in 915