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

STONE MT prefixes in area code 540

NANPA records 6 assigned NXX blocks to rate center STONE MT in area code 540, 0.8% of the 786 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 ONVOY, LLC - VA (3), VERIZON VIRGINIA, INC. (2), BANDWIDTH.COM CLEC, LLC - VA (1). The earliest assignment on record here is 2018-08-20 and the most recent 2023-09-21. 5 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

6 assigned blocks – 0.8% of 540
3 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
540-296 Verizon VERIZON VIRGINIA, INC. – yes yes
540-297 Verizon VERIZON VIRGINIA, INC. – no yes
540-328 Bandwidth BANDWIDTH.COM CLEC, LLC - VA – yes yes
540-410 Onvoy ONVOY, LLC - VA 2018-08-20 yes yes
540-703 Onvoy ONVOY, LLC - VA 2023-09-21 yes yes
540-956 Onvoy ONVOY, LLC - VA 2022-02-08 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
ONVOY, LLC - VA Onvoy 3 50%
VERIZON VIRGINIA, INC. Verizon 2 33.3%
BANDWIDTH.COM CLEC, LLC - VA Bandwidth 1 16.7%

Frequently asked

Which prefixes belong to STONE MT in area code 540?

6 blocks: 296, 297, 328, 410, 703, 956. The table above gives the holder of each.

Which carriers have numbers in STONE MT?

ONVOY, LLC - VA (3 blocks), VERIZON VIRGINIA, INC. (2 blocks), BANDWIDTH.COM CLEC, LLC - VA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is STONE MT 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 540

All 786 prefixes in 540