CHARLEVOIX prefixes in area code 231
NANPA records 7 assigned NXX blocks to rate center CHARLEVOIX in area code 231, 1.2% of the 572 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. 5 holders hold those blocks, the largest being MICHIGAN BELL TEL CO (2), OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC (2), BANDWIDTH.COM CLEC, LLC - MI (1). The earliest assignment on record here is 2002-08-27 and the most recent 2025-07-31. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 231-237 | AT&T MICHIGAN BELL TEL CO | – | yes | yes |
| 231-289 | Bandwidth BANDWIDTH.COM CLEC, LLC - MI | 2018-07-19 | yes | yes |
| 231-308 | INTERACTIVE SERVICES NETWORK, INC. | – | no | yes |
| 231-437 | T-Mobile OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | – | yes | yes |
| 231-520 | 123.NET, LLC | 2002-08-27 | no | yes |
| 231-547 | AT&T MICHIGAN BELL TEL CO | – | no | yes |
| 231-552 | T-Mobile OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2025-07-31 | 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
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| MICHIGAN BELL TEL CO | AT&T | 2 | 28.6% |
| OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | T-Mobile | 2 | 28.6% |
| BANDWIDTH.COM CLEC, LLC - MI | Bandwidth | 1 | 14.3% |
| INTERACTIVE SERVICES NETWORK, INC. | – | 1 | 14.3% |
| 123.NET, LLC | – | 1 | 14.3% |
Frequently asked
Which prefixes belong to CHARLEVOIX in area code 231?
7 blocks: 237, 289, 308, 437, 520, 547, 552. The table above gives the holder of each.
Which carriers have numbers in CHARLEVOIX?
MICHIGAN BELL TEL CO (2 blocks), OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC (2 blocks), BANDWIDTH.COM CLEC, LLC - MI (1 block), INTERACTIVE SERVICES NETWORK, INC. (1 block), 123.NET, 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 CHARLEVOIX 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.