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 |
|---|---|---|---|---|---|---|
| — | 530-626 | not yet reported which blocks → | PACIFIC BELL | 9740 | PLVL WEST | CA |
| — | 530-627 | 1XXX2XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → | FRONTIER CALIFORNIA INC. | 4420 | ORLEANS | CA |
| — | 530-628 | 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER CALIFORNIA INC. | 4420 | HAYFORK | CA |
| — | 530-629 | 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER CALIFORNIA INC. | 4420 | WILLOW CRK | CA |
| — | 530-632 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MARYSVILLE | CA |
| — | 530-633 | 3XXX5XXX6XXX7XXX · 4 holders which blocks → | PACIFIC BELL | 9740 | WHEATLAND | CA |
| — | 530-634 | not yet reported which blocks → | PACIFIC BELL | 9740 | MARYSVILLE | CA |
| — | 530-635 | 5XXX7XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MARYSVILLE | CA |
| — | 530-637 | 0XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → | FRONTIER CALIFORNIA INC. | 4420 | CLFX WEMR | CA |
| — | 530-639 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | PACIFIC BELL | 9740 | SMARTSVL | CA |
| — | 530-640 | 4XXX5XXX6XXX8XXX · 3 holders which blocks → | UNITED STATES CELLULAR - CA | 6261 | ALTURAS | CA |
| — | 530-641 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WHEATLAND | CA |
| — | 530-642 | 6XXX which blocks → | PACIFIC BELL | 9740 | PLVL WEST | CA |
| — | 530-644 | not yet reported which blocks → | PACIFIC BELL | 9740 | PLVL WEST | CA |
| — | 530-645 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MARYSVILLE | CA |
| — | 530-646 | 3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | IP HORIZON LLC | 515J | REDDING | CA |
| — | 530-647 | 3XXX4XXX6XXX7XXX · 4 holders which blocks → | PACIFIC BELL | 9740 | PLVL WEST | CA |
| — | 530-651 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | ONVOY, LLC - CA | 649C | PLVL WEST | CA |
| — | 530-652 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | GRVY SOUTH | CA |
| — | 530-653 | 4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | AUBN NORTH | CA |
| — | 530-654 | 5XXX which blocks → | ONVOY, LLC - CA | 649C | DUNNIGAN | CA |
| — | 530-655 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - CA | 649C | NICOLAUS | CA |
| — | 530-656 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | PACIFIC BELL | 9740 | NICOLAUS | CA |
| — | 530-658 | 1XXX2XXX6XXX7XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | ESPARTO | CA |
| — | 530-659 | 2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | PACIFIC BELL | 9740 | SOUTHTAHOE | CA |
| — | 530-660 | not yet reported which blocks → | ONVOY, LLC - CA | 649C | NORTH YUBA | CA |
| — | 530-661 | 8XXX which blocks → | PACIFIC BELL | 9740 | WOODLAND | CA |
| — | 530-662 | not yet reported which blocks → | PACIFIC BELL | 9740 | WOODLAND | CA |
| — | 530-663 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLVL SOUTH | CA |
| — | 530-664 | not yet reported which blocks → | CAL-ORE TELEPHONE CO. | 2311 | NEWELL | CA |
| — | 530-665 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | WOODLAND | CA |
| — | 530-666 | not yet reported which blocks → | PACIFIC BELL | 9740 | WOODLAND | CA |
| — | 530-667 | not yet reported which blocks → | CAL-ORE TELEPHONE CO. | 2311 | TULELAKE | CA |
| — | 530-668 | not yet reported which blocks → | PACIFIC BELL | 9740 | WOODLAND | CA |
| — | 530-669 | none assigned yet which blocks → | PACIFIC BELL | 9740 | WOODLAND | CA |
| — | 530-671 | not yet reported which blocks → | PACIFIC BELL | 9740 | MARYSVILLE | CA |
| — | 530-672 | not yet reported which blocks → | PACIFIC BELL | 9740 | SHINGLESPG | CA |
| — | 530-673 | not yet reported which blocks → | PACIFIC BELL | 9740 | MARYSVILLE | CA |
| — | 530-674 | not yet reported which blocks → | PACIFIC BELL | 9740 | MARYSVILLE | CA |
| — | 530-675 | 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | PACIFIC BELL | 9740 | CHALLENGE | CA |
| — | 530-676 | not yet reported which blocks → | PACIFIC BELL | 9740 | SHINGLESPG | CA |
| — | 530-677 | not yet reported which blocks → | PACIFIC BELL | 9740 | SHINGLESPG | CA |
| — | 530-678 | 2XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | DUNSMUIR | CA |
| — | 530-679 | 4XXX which blocks → | PACIFIC BELL | 9740 | BANGOR | CA |
| — | 530-680 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-681 | 4XXX which blocks → | METROPCS, INC. | 5562 | WOODLAND | CA |
| — | 530-682 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MARYSVILLE | CA |
| — | 530-683 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SHINGLESPG | CA |
| — | 530-684 | 1XXX2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTAGUE | CA |
| — | 530-685 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WILLOWS | 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.