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

GWINN prefixes in area code 906

NANPA records 4 assigned NXX blocks to rate center GWINN in area code 906, 1.1% of the 360 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 MICHIGAN BELL TEL CO (2), LEVEL 3 COMMUNICATIONS, LLC - MI (1), ONVOY SPECTRUM, LLC (1). The earliest assignment on record here is 2018-11-21 and the most recent 2024-10-17. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 1.1% of 906
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
906-256 Lumen LEVEL 3 COMMUNICATIONS, LLC - MI 2018-11-21 yes yes
906-346 AT&T MICHIGAN BELL TEL CO – yes yes
906-372 AT&T MICHIGAN BELL TEL CO – yes yes
906-913 Charter ONVOY SPECTRUM, LLC 2024-10-17 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
MICHIGAN BELL TEL CO AT&T 2 50%
LEVEL 3 COMMUNICATIONS, LLC - MI Lumen 1 25%
ONVOY SPECTRUM, LLC Charter 1 25%

Frequently asked

Which prefixes belong to GWINN in area code 906?

4 blocks: 256, 346, 372, 913. The table above gives the holder of each.

Which carriers have numbers in GWINN?

MICHIGAN BELL TEL CO (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - MI (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 GWINN 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 906

All 360 prefixes in 906