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 |
|---|---|---|---|---|---|---|
| 2023-11-01 | 559-881 | 0–9 XXXall 10 · 2 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FRESNO | CA |
| 2022-10-05 | 559-810 | 1XXX7XXX9XXX · 3 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARUTHERS | CA |
| 2015-07-09 | 559-775 | 0–9 XXXall 10 · 6 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CHOWCHILLA | CA |
| 2007-07-02 | 559-475 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FRESNO | CA |
| 2006-06-28 | 559-840 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FRESNO | CA |
| — | 559-210 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SANJOAQUIN | CA |
| — | 559-254 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | PARLIER | CA |
| — | 559-343 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | STRATFORD | CA |
| — | 559-366 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | TULARE | CA |
| — | 559-743 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | REEDLEY | CA |
| — | 559-762 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CORCORAN | CA |
| — | 559-772 | 0–9 XXXall 10 · 6 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | HANFORD | CA |
| — | 559-780 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CORCORAN | 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.