NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026
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 |
|---|---|---|---|---|---|---|
| 2007-01-17 | 916-333 | 0–9 XXXall 10 · 5 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM NORTH | CA |
| — | 916-237 | 1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | RIO LINDA | CA |
| — | 916-251 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SO PLACER | CA |
| — | 916-252 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PLEASATGRV | CA |
| — | 916-253 | 3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | LINCOLN | CA |
| — | 916-282 | 8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
| — | 916-290 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
| — | 916-304 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | MICHIGNBAR | CA |
| — | 916-314 | 5XXX7XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | MICHIGNBAR | CA |
| — | 916-471 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
| — | 916-594 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
| — | 916-720 | 1XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
| — | 916-848 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
| — | 916-860 | 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | FAIR OAKS | CA |
| — | 916-866 | 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | FAIR OAKS | CA |
| — | 916-914 | 0XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SCRM MAIN | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.