Recent prefix assignments
375 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026
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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 559-679 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | VISALIA | CA |
| — | 559-681 | none assigned yet which blocks → | METROPCS, INC. | 5562 | FRESNO | CA |
| — | 559-683 | not yet reported which blocks → | SIERRA TEL. CO., INC. | 2338 | COARSEGOLD | CA |
| — | 559-684 | 2XXX5XXX6XXX · 3 holders which blocks → | PACIFIC BELL | 9740 | TULARE | CA |
| — | 559-685 | not yet reported which blocks → | PACIFIC BELL | 9740 | TULARE | CA |
| — | 559-686 | not yet reported which blocks → | PACIFIC BELL | 9740 | TULARE | CA |
| — | 559-687 | 5XXX which blocks → | PACIFIC BELL | 9740 | TULARE | CA |
| — | 559-688 | not yet reported which blocks → | PACIFIC BELL | 9740 | TULARE | CA |
| — | 559-689 | not yet reported which blocks → | SIERRA TEL. CO., INC. | 2338 | RAYMOND | CA |
| — | 559-692 | not yet reported which blocks → | SIERRA TEL. CO., INC. | 2338 | COARSEGOLD | CA |
| — | 559-693 | 5XXX6XXX which blocks → | FRONTIER CALIFORNIA INC. | 4420 | SANJOAQUIN | CA |
| — | 559-694 | 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | METROPCS, INC. | 5562 | FIREBAUGH | CA |
| — | 559-696 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FRESNO | CA |
| — | 559-697 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | VISALIA | CA |
| — | 559-698 | 3XXX4XXX6XXX8XXX · 2 holders which blocks → | FRONTIER CALIFORNIA INC. | 4420 | SANJOAQUIN | CA |
| — | 559-700 | not yet reported which blocks → | CA | |||
| — | 559-706 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MADERA | CA |
| — | 559-707 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | HANFORD | CA |
| — | 559-711 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | CA |
| — | 559-713 | 6XXX8XXX · 2 holders which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-715 | 0–9 XXXall 10 · 8 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CHOWCHILLA | CA |
| — | 559-717 | 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | AVENAL | CA |
| — | 559-718 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | MADERA | CA |
| — | 559-719 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTERVL | CA |
| — | 559-723 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | VISALIA | CA |
| — | 559-728 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | FRESNO | CA |
| — | 559-730 | 4XXX which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-731 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | VISALIA | CA |
| — | 559-732 | not yet reported which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-733 | not yet reported which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-734 | not yet reported which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-735 | not yet reported which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-737 | none assigned yet which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-738 | 6XXX which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-739 | 9XXX which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-740 | 1XXX7XXX · 2 holders which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-741 | 3XXX5XXX6XXX which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-742 | 1XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RIVERDALE | CA |
| — | 559-743 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | REEDLEY | CA |
| — | 559-744 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | ONVOY, LLC - CA | 649C | SPRINGVL | CA |
| — | 559-745 | 1XXX2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → | ONVOY, LLC - CA | 649C | SEQUOIA | CA |
| — | 559-746 | 3XXX4XXX6XXX9XXX · 2 holders which blocks → | ONVOY, LLC - CA | 649C | VISALIA | CA |
| — | 559-747 | 2XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-748 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | EXETER | CA |
| — | 559-749 | 1XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | PACIFIC BELL | 9740 | VISALIA | CA |
| — | 559-750 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | VISALIA | CA |
| — | 559-751 | 3XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | ALPAUGH | CA |
| — | 559-752 | 2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → | PACIFIC BELL | 9740 | TIPTON | CA |
| — | 559-756 | 7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTERVL | CA |
| — | 559-757 | 2XXX4XXX6XXX8XXX · 4 holders which blocks → | PACIFIC BELL | 9740 | PIXLEY | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.