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

MULLIKEN prefixes in area code 517

NANPA records 3 assigned NXX blocks to rate center MULLIKEN in area code 517, 0.5% 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. 3 holders hold those blocks, the largest being AT&T ENTERPRISES, LLC (1), MICHIGAN BELL TEL CO (1), ACD TELECOM, INC. - MI (1). The earliest assignment on record here is 2001-11-15 and the most recent 2023-08-29. 3 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 517
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
517-310 AT&T AT&T ENTERPRISES, LLC 2023-08-29 yes yes
517-649 AT&T MICHIGAN BELL TEL CO – yes yes
517-948 ACD TELECOM, INC. - MI 2001-11-15 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
AT&T ENTERPRISES, LLC AT&T 1 33.3%
MICHIGAN BELL TEL CO AT&T 1 33.3%
ACD TELECOM, INC. - MI – 1 33.3%

Frequently asked

Which prefixes belong to MULLIKEN in area code 517?

3 blocks: 310, 649, 948. The table above gives the holder of each.

Which carriers have numbers in MULLIKEN?

AT&T ENTERPRISES, LLC (1 block), MICHIGAN BELL TEL CO (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 MULLIKEN 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