SUNFIELD prefixes in area code 517
NANPA records 4 assigned NXX blocks to rate center SUNFIELD 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 NEW CINGULAR WIRELESS PCS, LLC - IL (1), ONVOY, LLCV - MI (1), BRIGHTSPEED OF CENTRAL MICHIGAN, INC (1). The earliest assignment on record here is 2002-06-18 and the most recent 2018-09-25. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 517-288 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2004-12-20 | yes | yes |
| 517-500 | Onvoy ONVOY, LLCV - MI | 2018-09-25 | yes | yes |
| 517-566 | Brightspeed BRIGHTSPEED OF CENTRAL MICHIGAN, INC | – | yes | yes |
| 517-597 | ACD TELECOM, INC. - MI | 2002-06-18 | 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
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 1 | 25% |
| ONVOY, LLCV - MI | Onvoy | 1 | 25% |
| BRIGHTSPEED OF CENTRAL MICHIGAN, INC | Brightspeed | 1 | 25% |
| ACD TELECOM, INC. - MI | – | 1 | 25% |
Frequently asked
Which prefixes belong to SUNFIELD in area code 517?
4 blocks: 288, 500, 566, 597. The table above gives the holder of each.
Which carriers have numbers in SUNFIELD?
NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), ONVOY, LLCV - MI (1 block), BRIGHTSPEED OF CENTRAL MICHIGAN, INC (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 SUNFIELD 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.