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

SPARTA prefixes in area code 616

NANPA records 7 assigned NXX blocks to rate center SPARTA in area code 616, 1.3% of the 545 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. 7 holders hold those blocks, the largest being INTERACTIVE SERVICES NETWORK, INC. (1), AT&T ENTERPRISES, LLC (1), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI (1). The earliest assignment on record here is 2004-12-06 and the most recent 2021-05-25. 6 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 336, 417, 608, 618 – overlay codes cover the same geography, so a rate center is served by all of them.

7 assigned blocks – 1.3% of 616
7 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
616-205 INTERACTIVE SERVICES NETWORK, INC. 2004-12-06 yes yes
616-383 AT&T AT&T ENTERPRISES, LLC 2012-11-12 yes yes
616-520 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI – yes yes
616-535 T-Mobile METROPCS, INC. 2018-09-13 yes yes
616-606 Bandwidth BANDWIDTH.COM CLEC, LLC - MI – yes yes
616-661 Charter ONVOY SPECTRUM, LLC 2021-05-25 yes yes
616-887 AT&T MICHIGAN BELL TEL CO – 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
INTERACTIVE SERVICES NETWORK, INC. – 1 14.3%
AT&T ENTERPRISES, LLC AT&T 1 14.3%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI Verizon 1 14.3%
METROPCS, INC. T-Mobile 1 14.3%
BANDWIDTH.COM CLEC, LLC - MI Bandwidth 1 14.3%
ONVOY SPECTRUM, LLC Charter 1 14.3%
MICHIGAN BELL TEL CO AT&T 1 14.3%

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 SPARTA in area code 616?

7 blocks: 205, 383, 520, 535, 606, 661, 887. The table above gives the holder of each.

Which carriers have numbers in SPARTA?

INTERACTIVE SERVICES NETWORK, INC. (1 block), AT&T ENTERPRISES, LLC (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI (1 block), METROPCS, INC. (1 block), BANDWIDTH.COM CLEC, LLC - MI (1 block), ONVOY SPECTRUM, 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 SPARTA 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 616

All 545 prefixes in 616