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 |
|---|---|---|---|---|---|---|
| 2005-02-09 | 805-540 | 0–9 XXXall 10 · 2 holders which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | SNLUSOBSPO | CA |
| — | 805-255 | 0XXX1XXX2XXX4XXX6XXX7XXX9XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | SANBARBARA | CA |
| — | 805-281 | 1XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | SATICOY | CA |
| — | 805-282 | 0XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | NEWBURYPRK | CA |
| — | 805-435 | not yet reported which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | THOUSAOAKS | CA |
| — | 805-753 | 1XXX2XXX4XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | NEWBURYPRK | CA |
| — | 805-789 | 1XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | OXNARD | CA |
| — | 805-808 | 0XXX1XXX5XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | CAMARILLO | CA |
| — | 805-877 | 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | VNTRA EAST | CA |
| — | 805-932 | 2XXX5XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | SATICOY | CA |
| — | 805-945 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | SNLUSOBSPO | CA |
| — | 805-999 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX which blocks → | UTILITY TELECOM GROUP, LLC - CA | 9262 | SANTAMARIA | 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.