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

HOLMEN prefixes in area code 608

NANPA records 4 assigned NXX blocks to rate center HOLMEN in area code 608, 0.5% of the 785 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 BRIGHTSPEED OF CENTRAL WISCONSIN, LLC (2), NEW CINGULAR WIRELESS PCS, LLC - IL (1), T-MOBILE USA, INC. (1). The earliest assignment on record here is 2001-05-16 and the most recent 2025-01-21. 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.5% of 608
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
608-399 Brightspeed BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 2001-05-16 yes yes
608-526 Brightspeed BRIGHTSPEED OF CENTRAL WISCONSIN, LLC – no yes
608-540 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2018-10-08 yes yes
608-952 T-Mobile T-MOBILE USA, INC. 2025-01-21 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
BRIGHTSPEED OF CENTRAL WISCONSIN, LLC Brightspeed 2 50%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 25%
T-MOBILE USA, INC. T-Mobile 1 25%

Frequently asked

Which prefixes belong to HOLMEN in area code 608?

4 blocks: 399, 526, 540, 952. The table above gives the holder of each.

Which carriers have numbers in HOLMEN?

BRIGHTSPEED OF CENTRAL WISCONSIN, LLC (2 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), T-MOBILE USA, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is HOLMEN 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 608

All 785 prefixes in 608