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

CASEVILLE prefixes in area code 989

NANPA records 3 assigned NXX blocks to rate center CASEVILLE in area code 989, 0.4% of the 723 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), FRONTIER NORTH, INC. - MI (1). The earliest assignment on record here is 2002-01-17 and the most recent 2002-01-17. 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.4% of 989
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
989-438 INTERACTIVE SERVICES NETWORK, INC. 2002-01-17 no yes
989-819 Onvoy ONVOY, LLCV - MI – yes yes
989-856 Frontier FRONTIER NORTH, INC. - MI – 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%
FRONTIER NORTH, INC. - MI Frontier 1 33.3%

Frequently asked

Which prefixes belong to CASEVILLE in area code 989?

3 blocks: 438, 819, 856. The table above gives the holder of each.

Which carriers have numbers in CASEVILLE?

INTERACTIVE SERVICES NETWORK, INC. (1 block), ONVOY, LLCV - MI (1 block), FRONTIER NORTH, 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 CASEVILLE 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 989

All 723 prefixes in 989