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 |
|---|---|---|---|---|---|---|
| — | 201-210 | 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | UNION CITY | NJ |
| — | 201-228 | 0XXX1XXX3XXX4XXX6XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | LEONIA | NJ |
| — | 201-231 | 1XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | AT&T - LOCAL | 7421 | RUTHERFORD | NJ |
| — | 201-234 | 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | JERSEYCITY | NJ |
| — | 201-256 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | CLOSTER | NJ |
| — | 201-258 | 0XXX3XXX4XXX7XXX9XXX · 3 holders which blocks → | AT&T - LOCAL | 7421 | RAMSEY | NJ |
| — | 201-266 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | ENGLEWOOD | NJ |
| — | 201-430 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | UNION CITY | NJ |
| — | 201-442 | 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | UNION CITY | NJ |
| — | 201-469 | 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | AT&T - LOCAL | 7421 | JERSEYCITY | NJ |
| — | 201-527 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | AT&T - LOCAL | 7421 | HACKENSACK | NJ |
| — | 201-800 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → | AT&T - LOCAL | 7421 | WYCKOFF | NJ |
| — | 201-949 | 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | AT&T - LOCAL | 7421 | PARK RIDGE | NJ |
| — | 201-987 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → | AT&T - LOCAL | 7421 | ORADELL | 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.