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

TECUMSEH prefixes in area code 517

NANPA records 7 assigned NXX blocks to rate center TECUMSEH in area code 517, 1.1% 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. 5 holders hold those blocks, the largest being FRONTIER NORTH, INC. - MI (3), NEW CINGULAR WIRELESS PCS, LLC - IL (1), TC3 TELECOM, INC. - MI (1). The earliest assignment on record here is 2022-01-11 and the most recent 2022-01-11. 4 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 402, 405, 531, 572 – overlay codes cover the same geography, so a rate center is served by all of them.

7 assigned blocks – 1.1% of 517
5 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
517-301 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
517-423 Frontier FRONTIER NORTH, INC. - MI – no yes
517-424 Frontier FRONTIER NORTH, INC. - MI – yes yes
517-470 TC3 TELECOM, INC. - MI – no yes
517-809 INTERACTIVE SERVICES NETWORK, INC. – no yes
517-815 Frontier FRONTIER NORTH, INC. - MI – yes yes
517-837 TON80 COMMUNICATIONS, LLC 2022-01-11 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. - MI Frontier 3 42.9%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 14.3%
TC3 TELECOM, INC. - MI – 1 14.3%
INTERACTIVE SERVICES NETWORK, INC. – 1 14.3%
TON80 COMMUNICATIONS, LLC – 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 TECUMSEH in area code 517?

7 blocks: 301, 423, 424, 470, 809, 815, 837. The table above gives the holder of each.

Which carriers have numbers in TECUMSEH?

FRONTIER NORTH, INC. - MI (3 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), TC3 TELECOM, INC. - MI (1 block), INTERACTIVE SERVICES NETWORK, INC. (1 block), TON80 COMMUNICATIONS, 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 TECUMSEH 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