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

LAINGSBURG prefixes in area code 517

NANPA records 4 assigned NXX blocks to rate center LAINGSBURG in area code 517, 0.6% of the 616 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. 4 holders hold those blocks, the largest being ONVOY, LLCV - MI (1), FRONTIER NORTH, INC. - MI (1), NEW CINGULAR WIRELESS PCS, LLC - IL (1). The earliest assignment on record here is 2001-11-15 and the most recent 2023-07-05. 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.6% of 517
4 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
517-354 Onvoy ONVOY, LLCV - MI 2023-07-05 yes yes
517-651 Frontier FRONTIER NORTH, INC. - MI – yes yes
517-919 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
517-941 ACD TELECOM, INC. - MI 2001-11-15 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
ONVOY, LLCV - MI Onvoy 1 25%
FRONTIER NORTH, INC. - MI Frontier 1 25%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 25%
ACD TELECOM, INC. - MI – 1 25%

Frequently asked

Which prefixes belong to LAINGSBURG in area code 517?

4 blocks: 354, 651, 919, 941. The table above gives the holder of each.

Which carriers have numbers in LAINGSBURG?

ONVOY, LLCV - MI (1 block), FRONTIER NORTH, INC. - MI (1 block), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), ACD TELECOM, INC. - MI (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is LAINGSBURG 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 517

All 616 prefixes in 517