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

CAMBRIDGE prefixes in area code 608

NANPA records 3 assigned NXX blocks to rate center CAMBRIDGE 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 FRONTIER NORTH INC. - WI (1), BANDWIDTH.COM CLEC, LLC - WI (1), LEVEL 3 COMMUNICATIONS, LLC - WI (1). The earliest assignment on record here is 2014-11-25 and the most recent 2014-12-04. 3 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 208, 308, 309, 410 – 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
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
608-423 Frontier FRONTIER NORTH INC. - WI – yes yes
608-496 Bandwidth BANDWIDTH.COM CLEC, LLC - WI 2014-12-04 yes yes
608-699 Lumen LEVEL 3 COMMUNICATIONS, LLC - WI 2014-11-25 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
FRONTIER NORTH INC. - WI Frontier 1 33.3%
BANDWIDTH.COM CLEC, LLC - WI Bandwidth 1 33.3%
LEVEL 3 COMMUNICATIONS, LLC - WI Lumen 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 CAMBRIDGE in area code 608?

3 blocks: 423, 496, 699. The table above gives the holder of each.

Which carriers have numbers in CAMBRIDGE?

FRONTIER NORTH INC. - WI (1 block), BANDWIDTH.COM CLEC, LLC - WI (1 block), LEVEL 3 COMMUNICATIONS, LLC - WI (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is CAMBRIDGE 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