DUNCAN prefixes in area code 580
NANPA records 15 assigned NXX blocks to rate center DUNCAN in area code 580, 2.0% of the 741 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. 8 holders hold those blocks, the largest being SOUTHWESTERN BELL (5), T-MOBILE USA, INC. (3), UNITED STATES CELLULAR - OK (2). The earliest assignment on record here is 2002-01-25 and the most recent 2026-02-20. 14 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, 662, 928 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 580-251 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 580-252 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 580-255 | AT&T SOUTHWESTERN BELL | – | no | yes |
| 580-467 | UNITED STATES CELLULAR - OK | – | yes | yes |
| 580-470 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 580-475 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 580-560 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK | 2003-07-07 | yes | yes |
| 580-605 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2026-02-20 | yes | yes |
| 580-606 | T-Mobile T-MOBILE USA, INC. | 2002-03-27 | yes | yes |
| 580-656 | UNITED STATES CELLULAR - OK | 2002-01-25 | yes | yes |
| 580-736 | T-Mobile T-MOBILE USA, INC. | 2002-04-09 | yes | yes |
| 580-786 | Lumen LEVEL 3 COMMUNICATIONS, LLC - OK | 2002-05-14 | yes | yes |
| 580-860 | Telnyx TELNYX LLC | 2017-03-14 | yes | yes |
| 580-943 | T-Mobile T-MOBILE USA, INC. | 2019-04-09 | yes | yes |
| 580-990 | TON80 COMMUNICATIONS, LLC | 2022-03-17 | 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 |
|---|---|---|---|
| SOUTHWESTERN BELL | AT&T | 5 | 33.3% |
| T-MOBILE USA, INC. | T-Mobile | 3 | 20% |
| UNITED STATES CELLULAR - OK | – | 2 | 13.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK | Verizon | 1 | 6.7% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 1 | 6.7% |
| LEVEL 3 COMMUNICATIONS, LLC - OK | Lumen | 1 | 6.7% |
| TELNYX LLC | Telnyx | 1 | 6.7% |
| TON80 COMMUNICATIONS, LLC | – | 1 | 6.7% |
Frequently asked
Which prefixes belong to DUNCAN in area code 580?
15 blocks: 251, 252, 255, 467, 470, 475, 560, 605, 606, 656, 736, 786 and 3 more, all listed in the table above.
Which carriers have numbers in DUNCAN?
SOUTHWESTERN BELL (5 blocks), T-MOBILE USA, INC. (3 blocks), UNITED STATES CELLULAR - OK (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK (1 block), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), LEVEL 3 COMMUNICATIONS, LLC - OK (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is DUNCAN 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.