NumberResearchRecent prefix assignments
341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
Most active assignees, last 30 days
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2015-03-04 | 385-448 | 0–9 XXXall 10 · 6 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SPANIHFORK | UT |
| 2015-03-04 | 405-855 | 0–9 XXXall 10 · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | MIDWEST CY | OK |
| 2015-03-04 | 431-205 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Steinbach | — |
| 2015-03-04 | 442-274 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PALMDESERT | CA |
| 2015-03-04 | 469-763 | 0–9 XXXall 10 · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | LEWISVILLE | TX |
| 2015-03-04 | 559-727 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | FRESNO | CA |
| 2015-03-04 | 562-351 | 0–9 XXXall 10 · 6 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WHITTIER | CA |
| 2015-03-04 | 562-357 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ALAMITOS | CA |
| 2015-03-04 | 661-534 | 0–9 XXXall 10 · 4 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | DELANO | CA |
| 2015-03-04 | 705-708 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Bracebridge | — |
| 2015-03-04 | 757-527 | 0–9 XXXall 10 · 8 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | NWPTNWSZN3 | VA |
| 2015-03-04 | 778-594 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Kelowna | — |
| 2015-03-04 | 916-578 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | SCRM MAIN | CA |
| 2015-03-03 | 331-979 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | ELMHURST | IL |
| 2015-03-03 | 405-985 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | OKLA CITY | OK |
| 2015-03-03 | 478-888 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC - GA | 067D | SANDERSVL | GA |
| 2015-03-03 | 587-384 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Edmonton | — |
| 2015-03-03 | 587-691 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Lethbridge | — |
| 2015-03-03 | 587-693 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Red Deer | — |
| 2015-03-03 | 720-717 | 0–9 XXXall 10 · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2015-03-03 | 813-906 | 0–9 XXXall 10 · 3 holders which blocks → | MCI WORLDCOM COMMUNICATIONS, INC. - FL | 7448 | TAMPACEN | FL |
| 2015-03-03 | 929-330 | 0–9 XXXwhole prefix which blocks → | OMNIPOINT COMMUNICATIONS, INC. - NY | 6622 | NWYRCYZN04 | NY |
| 2015-03-03 | 929-344 | 0–9 XXXall 10 · 2 holders which blocks → | OMNIPOINT COMMUNICATIONS, INC. - NY | 6622 | NWYRCYZN08 | NY |
| 2015-03-03 | 929-434 | 0–9 XXXwhole prefix which blocks → | OMNIPOINT COMMUNICATIONS, INC. - NY | 6622 | NWYRCYZN07 | NY |
| 2015-03-03 | 941-218 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - FL | 982E | VENICE | FL |
| 2015-03-03 | 949-447 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | IRVINE | CA |
| 2015-03-03 | 956-708 | 0–9 XXXall 10 · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BROWNSVL | TX |
| 2015-03-03 | 971-770 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BEAVERTON | OR |
| 2015-03-02 | 209-949 | 0–9 XXXall 10 · 4 holders which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | STOCKTON | CA |
| 2015-03-02 | 226-850 | not yet reported which blocks → | TELUS Integrated Communications | 2782 | Orangeville | — |
| 2015-03-02 | 226-853 | not yet reported which blocks → | TELUS Integrated Communications | 2782 | Mount Forest | — |
| 2015-03-02 | 229-675 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM GEORGIA COMMUNICATIONS CORP. | 4332 | PRESTON | GA |
| 2015-03-02 | 229-989 | 2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → | GEORGIA WINDSTREAM, INC. | 4425 | ROCHELLE | GA |
| 2015-03-02 | 314-250 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST LOUIS | MO |
| 2015-03-02 | 343-472 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Madoc | — |
| 2015-03-02 | 346-218 | 0–9 XXXall 10 · 3 holders which blocks → | AERIAL COMMUNICATIONS, INC. | 6701 | CYPRESS | TX |
| 2015-03-02 | 352-631 | 0–9 XXXall 10 · 4 holders which blocks → | AERIAL COMMUNICATIONS, INC. | 6701 | BROOKSVL | FL |
| 2015-03-02 | 618-999 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC | 224C | EDWARDSVL | IL |
| 2015-03-02 | 762-329 | 0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM GEORGIA COMMUNICATIONS CORP. | 4332 | SUMMERVL | GA |
| 2015-03-02 | 778-506 | not yet reported which blocks → | Navigata Communications Limited | 078G | Vernon | — |
| 2015-03-02 | 850-800 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - FL | 937C | TALLAHASSE | FL |
| 2015-03-02 | 863-999 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - FL | 937C | LAKELAND | FL |
| 2015-03-02 | 873-826 | not yet reported which blocks → | Cooptel | 818D | Bromptonville | — |
| 2015-03-02 | 912-616 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | WINDSTREAM GEORGIA COMMUNICATIONS CORP. | 4332 | MT VERNON | GA |
| 2015-03-02 | 913-222 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC - KS | 205F | KANSASCITY | KS |
| 2015-03-02 | 939-297 | 0–9 XXXall 10 · 3 holders which blocks → | SUNCOM DBA T-MOBILE USA | 8645 | ARECIBO | PR |
| 2015-03-02 | 941-666 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - FL | 937C | BRADENTON | FL |
| 2015-02-27 | 779-302 | 0–9 XXXall 10 · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | WOODSTOCK | IL |
| 2015-02-27 | 781-971 | 0–9 XXXall 10 · 3 holders which blocks → | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BRAINTREE | MA |
| 2015-02-27 | 857-316 | 0–9 XXXall 10 · 6 holders which blocks → | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BRIGHTON | MA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.