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

FRISCOCITY prefixes in area code 251

NANPA records 4 assigned NXX blocks to rate center FRISCOCITY in area code 251, 0.8% of the 528 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 - AL (2), FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL (1), ONVOY SPECTRUM, LLC (1). The earliest assignment on record here is 2018-11-16 and the most recent 2021-10-14. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.8% of 251
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
251-267 Frontier FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL – yes yes
251-440 Onvoy ONVOY, LLC - AL 2021-01-25 yes yes
251-505 Charter ONVOY SPECTRUM, LLC 2021-10-14 yes yes
251-572 Onvoy ONVOY, LLC - AL 2018-11-16 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 - AL Onvoy 2 50%
FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL Frontier 1 25%
ONVOY SPECTRUM, LLC Charter 1 25%

Frequently asked

Which prefixes belong to FRISCOCITY in area code 251?

4 blocks: 267, 440, 505, 572. The table above gives the holder of each.

Which carriers have numbers in FRISCOCITY?

ONVOY, LLC - AL (2 blocks), FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL (1 block), ONVOY SPECTRUM, 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 FRISCOCITY 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 251

All 528 prefixes in 251