NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026
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 |
|---|---|---|---|---|---|---|
| — | 951-719 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | FRONTIER CALIFORNIA INC. | 2319 | TEMECULA | CA |
| — | 951-763 | 3XXX6XXX7XXX8XXX · 3 holders which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT ANZA | CA |
| — | 951-765 | 7XXX which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HEMT | CA |
| — | 951-766 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HEMT | CA |
| — | 951-767 | 5XXX6XXX8XXX · 3 holders which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT SAGE | CA |
| — | 951-769 | 4XXX5XXX which blocks → | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| — | 951-791 | 9XXX which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HEMT | CA |
| — | 951-845 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| — | 951-849 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| — | 951-914 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | TEMECULA | CA |
| — | 951-922 | 4XXX5XXX6XXX · 2 holders which blocks → | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| — | 951-924 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | MORENO | CA |
| — | 951-925 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HEMT | CA |
| — | 951-926 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HMLD | CA |
| — | 951-927 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HEMT | CA |
| — | 951-928 | 7XXX which blocks → | FRONTIER CALIFORNIA INC. | 2319 | LAKEVIEWNU | CA |
| — | 951-929 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | HEMT HEMT | CA |
| — | 951-940 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | PERRIS | CA |
| — | 951-943 | not yet reported which blocks → | FRONTIER CALIFORNIA INC. | 2319 | PERRIS | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.