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 |
|---|---|---|---|---|---|---|
| — | 530-294 | 7XXX which blocks → | CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | BIEBER | CA |
| — | 530-295 | none assigned yet which blocks → | PACIFIC BELL | 9740 | PLVL WEST | CA |
| — | 530-296 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | PLVL KYBRZ | CA |
| — | 530-297 | 8XXX which blocks → | PACIFIC BELL | 9740 | DAVIS | CA |
| — | 530-298 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | ONVOY, LLC - CA | 649C | DAVIS | CA |
| — | 530-299 | 4XXX7XXX8XXX · 2 holders which blocks → | CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | ADIN | CA |
| — | 530-300 | 9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MARYSVILLE | CA |
| — | 530-301 | 7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MARYSVILLE | CA |
| — | 530-302 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | DAVIS | CA |
| — | 530-303 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | PLVL WEST | CA |
| — | 530-304 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DAVIS | CA |
| — | 530-305 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | AUBN MAIN | CA |
| — | 530-306 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLVL WEST | CA |
| — | 530-307 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOUTHTAHOE | CA |
| — | 530-308 | 3XXX which blocks → | T-MOBILE USA, INC. | 6529 | AUBN MAIN | CA |
| — | 530-309 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ONVOY, LLC - CA | 649C | WOODLAND | CA |
| — | 530-311 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | CA |
| — | 530-313 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SHINGLESPG | CA |
| — | 530-316 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | BLAIRSDEN | CA |
| — | 530-318 | 7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOUTHTAHOE | CA |
| — | 530-319 | 0–9 XXXall 10 · 6 holders which blocks → | CAL-ORE COMMUNICATIONS, INC. - CA | 734E | REDDING | CA |
| — | 530-320 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | AUBN MAIN | CA |
| — | 530-321 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHICO | CA |
| — | 530-322 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | PORTOLA | CA |
| — | 530-323 | not yet reported which blocks → | ONVOY, LLC - CA | 649C | COLFAX | CA |
| — | 530-324 | 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | WILLOW CRK | CA |
| — | 530-325 | not yet reported which blocks → | ONVOY, LLC - CA | 649C | DOWNIEVL | CA |
| — | 530-326 | none assigned yet which blocks → | ONVOY, LLC - CA | 649C | ORLAND | CA |
| — | 530-327 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | PARADISE | CA |
| — | 530-328 | 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | AUBN MAIN | CA |
| — | 530-329 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MARYSVILLE | CA |
| — | 530-330 | 4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | WILLOWS | CA |
| — | 530-331 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | IP HORIZON LLC | 515J | YREKA | CA |
| — | 530-332 | 0XXX8XXX · 2 holders which blocks → | PACIFIC BELL | 9740 | CHICO | CA |
| — | 530-333 | 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | PACIFIC BELL | 9740 | GEORGETOWN | CA |
| — | 530-334 | 0–9 XXXall 10 · 6 holders which blocks → | IP HORIZON LLC | 515J | GEORGETOWN | CA |
| — | 530-335 | 1XXX which blocks → | CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | BURNEY | CA |
| — | 530-336 | 1XXX2XXX4XXX8XXX · 4 holders which blocks → | CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | FALLRVRMLS | CA |
| — | 530-337 | 1XXX3XXX7XXX · 3 holders which blocks → | CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | MONTGOYCRK | CA |
| — | 530-339 | 0XXX1XXX2XXX5XXX6XXX8XXX · 2 holders which blocks → | PACIFIC BELL | 9740 | REDDING | CA |
| — | 530-340 | 4XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | YREKA | CA |
| — | 530-341 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DAVIS | CA |
| — | 530-342 | not yet reported which blocks → | PACIFIC BELL | 9740 | CHICO | CA |
| — | 530-343 | not yet reported which blocks → | PACIFIC BELL | 9740 | CHICO | CA |
| — | 530-344 | 2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → | PACIFIC BELL | 9740 | PLVL WEST | CA |
| — | 530-345 | not yet reported which blocks → | PACIFIC BELL | 9740 | CHICO | CA |
| — | 530-346 | 0XXX3XXX4XXX5XXX · 3 holders which blocks → | FRONTIER CALIFORNIA INC. | 4420 | COLFAX | CA |
| — | 530-347 | 8XXX which blocks → | PACIFIC BELL | 9740 | COTTONWOOD | CA |
| — | 530-348 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | COTTONWOOD | CA |
| — | 530-349 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | COLFAX | 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.