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 |
|---|---|---|---|---|---|---|
| — | 925-293 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | MARTINEZ | CA |
| — | 925-369 | 4XXX8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | MARTINEZ | CA |
| — | 925-475 | 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PLEASANTON | CA |
| — | 925-476 | 3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | WALNUT CRK | CA |
| — | 925-605 | 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | LIVERMORE | CA |
| — | 925-663 | 2XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SUNOL | CA |
| — | 925-664 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PSBG WEST | CA |
| — | 925-665 | 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PITTSBURG | CA |
| — | 925-666 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | ECONTRCOST | CA |
| — | 925-775 | 0XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | ANTIOCH | CA |
| — | 925-848 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | ANTIOCH | CA |
| — | 925-884 | 5XXX6XXX7XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | BSHP RNCH | CA |
| — | 925-885 | 4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | ORINDA | CA |
| — | 925-886 | 1XXX5XXX7XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | DANVILLE | CA |
| — | 925-887 | 4XXX9XXX · 2 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | CONCORD | CA |
| — | 925-888 | 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | MORAGA | CA |
| — | 925-889 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | CLAYTON | CA |
| — | 925-891 | 2XXX4XXX5XXX6XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | WALNUT CRK | CA |
| — | 925-892 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PLEASANTON | CA |
| — | 925-905 | 3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | DUBLN-SNRM | 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.