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

MILTON prefixes in area code 608

NANPA records 3 assigned NXX blocks to rate center MILTON in area code 608, 0.4% 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 CHARTER IP ENABLED SERVICES, LLC (1), ONVOY, LLC - WI (1), BRIGHTSPEED OF WESTERN WISCONSIN, LLC (1). The earliest assignment on record here is 2006-11-30 and the most recent 2021-07-14. 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 209, 217, 272, 302 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 608
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
608-580 Charter CHARTER IP ENABLED SERVICES, LLC 2006-11-30 yes yes
608-674 Onvoy ONVOY, LLC - WI 2021-07-14 yes yes
608-868 Brightspeed BRIGHTSPEED OF WESTERN WISCONSIN, LLC – 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
CHARTER IP ENABLED SERVICES, LLC Charter 1 33.3%
ONVOY, LLC - WI Onvoy 1 33.3%
BRIGHTSPEED OF WESTERN WISCONSIN, LLC Brightspeed 1 33.3%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to MILTON in area code 608?

3 blocks: 580, 674, 868. The table above gives the holder of each.

Which carriers have numbers in MILTON?

CHARTER IP ENABLED SERVICES, LLC (1 block), ONVOY, LLC - WI (1 block), BRIGHTSPEED OF WESTERN WISCONSIN, 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 MILTON 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