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 |
|---|---|---|---|---|---|---|
| — | 707-481 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-484 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-486 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-529 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-548 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-567 | 8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | VALLEJO | CA |
| — | 707-592 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | VACAVILLE | CA |
| — | 707-631 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FRFLD-SUIS | CA |
| — | 707-637 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NAPA | CA |
| — | 707-685 | 4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | VACAVILLE | CA |
| — | 707-688 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FRFLD-SUIS | CA |
| — | 707-695 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-696 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-738 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NAPA | CA |
| — | 707-799 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-953 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA ROSA | CA |
| — | 707-955 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HEALDSBURG | 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.