NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
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 |
|---|---|---|---|---|---|---|
| — | 530-518 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-521 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-545 | 4XXX5XXX6XXX7XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOUTHTAHOE | CA |
| — | 530-570 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-574 | 4XXX5XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DAVIS | CA |
| — | 530-586 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CORNING | CA |
| — | 530-592 | 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-604 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | REDDING | CA |
| — | 530-613 | 7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | AUBN MAIN | CA |
| — | 530-680 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-713 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MARYSVILLE | CA |
| — | 530-864 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CHICO | CA |
| — | 530-867 | 8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WOODLAND | CA |
| — | 530-917 | 1XXX2XXX3XXX7XXX8XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | REDDING | CA |
| — | 530-941 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | REDDING | CA |
| — | 530-945 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | REDDING | CA |
| — | 530-949 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | REDDING | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.