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

BRUTUS prefixes in area code 231

NANPA records 3 assigned NXX blocks to rate center BRUTUS in area code 231, 0.5% 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. 3 holders hold those blocks, the largest being INTERACTIVE SERVICES NETWORK, INC. (1), ONVOY, LLCV - MI (1), BRIGHTSPEED OF MICHIGAN, LLC (1). The earliest assignment on record here is 2004-03-24 and the most recent 2020-10-26. 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.5% of 231
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
231-205 INTERACTIVE SERVICES NETWORK, INC. 2004-03-24 no yes
231-304 Onvoy ONVOY, LLCV - MI 2020-10-26 yes yes
231-529 Brightspeed BRIGHTSPEED OF MICHIGAN, LLC – 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
INTERACTIVE SERVICES NETWORK, INC. – 1 33.3%
ONVOY, LLCV - MI Onvoy 1 33.3%
BRIGHTSPEED OF MICHIGAN, LLC Brightspeed 1 33.3%

Frequently asked

Which prefixes belong to BRUTUS in area code 231?

3 blocks: 205, 304, 529. The table above gives the holder of each.

Which carriers have numbers in BRUTUS?

INTERACTIVE SERVICES NETWORK, INC. (1 block), ONVOY, LLCV - MI (1 block), BRIGHTSPEED OF MICHIGAN, 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 BRUTUS 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 231

All 572 prefixes in 231