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

ROAN MT prefixes in area code 423

NANPA records 3 assigned NXX blocks to rate center ROAN MT in area code 423, 0.4% 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. 3 holders hold those blocks, the largest being BANDWIDTH.COM CLEC, LLC - TN (1), ONVOY, LLC - TN (1), UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN (1). The earliest assignment on record here is 2011-09-01 and the most recent 2021-04-15. 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.4% of 423
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
423-481 Bandwidth BANDWIDTH.COM CLEC, LLC - TN 2011-09-01 yes yes
423-678 Onvoy ONVOY, LLC - TN 2021-04-15 yes yes
423-772 Lumen UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN – no 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
BANDWIDTH.COM CLEC, LLC - TN Bandwidth 1 33.3%
ONVOY, LLC - TN Onvoy 1 33.3%
UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN Lumen 1 33.3%

Frequently asked

Which prefixes belong to ROAN MT in area code 423?

3 blocks: 481, 678, 772. The table above gives the holder of each.

Which carriers have numbers in ROAN MT?

BANDWIDTH.COM CLEC, LLC - TN (1 block), ONVOY, LLC - TN (1 block), UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is ROAN 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 423

All 764 prefixes in 423