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 |
|---|---|---|---|---|---|---|
| 2001-01-18 | 973-337 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | AT&T - LOCAL | 7421 | BLOOMFIELD | NJ |
| — | 973-240 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | WHIPPANY | NJ |
| — | 973-241 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | BERNARDSVL | NJ |
| — | 973-251 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | AT&T - LOCAL | 7421 | LIVINGSTON | NJ |
| — | 973-264 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | AT&T - LOCAL | 7421 | MADISON | NJ |
| — | 973-265 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | BOONTON | NJ |
| — | 973-287 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | AT&T - LOCAL | 7421 | CALDWELL | NJ |
| — | 973-339 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | AT&T - LOCAL | 7421 | LITTLE FLS | NJ |
| — | 973-341 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | PATERSON | NJ |
| — | 973-348 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | AT&T - LOCAL | 7421 | BERNARDSVL | NJ |
| — | 973-355 | 0XXX1XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | MORRISTOWN | NJ |
| — | 973-406 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | AT&T - LOCAL | 7421 | MT VIEW | NJ |
| — | 973-602 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | AT&T - LOCAL | 7421 | WHIPPANY | NJ |
| — | 973-607 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | DOVER | NJ |
| — | 973-637 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | WHIPPANY | NJ |
| — | 973-647 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | AT&T - LOCAL | 7421 | MORRISTOWN | NJ |
| — | 973-820 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | AT&T - LOCAL | 7421 | NEWARK | NJ |
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.