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 |
|---|---|---|---|---|---|---|
| 2021-05-14 | 540-813 | 0–9 XXXall 10 · 4 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | DUBLIN | VA |
| 2007-09-06 | 540-695 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | FLOYD | VA |
| 2001-05-18 | 540-598 | 0XXX1XXX2XXX which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROANOKE | VA |
| 2001-04-16 | 540-691 | 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | COVINGTON | VA |
| 2001-03-13 | 540-765 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | SALEM | VA |
| — | 540-309 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROANOKE | VA |
| — | 540-312 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROANOKE | VA |
| — | 540-320 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | RADFORD | VA |
| — | 540-330 | 1XXX which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROANOKE | VA |
| — | 540-339 | 2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROANOKE | VA |
| — | 540-357 | 6XXX7XXX8XXX9XXX which blocks → | UNITED STATES CELLULAR - VA | 6283 | CHRISTISBG | VA |
| — | 540-391 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | CHRISTISBG | VA |
| — | 540-392 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | CHRISTISBG | VA |
| — | 540-488 | 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROCKYMOUNT | VA |
| — | 540-493 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROCKYMOUNT | VA |
| — | 540-570 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | BUENAVISTA | VA |
| — | 540-572 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 8 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | BUENAVISTA | VA |
| — | 540-580 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | ROANOKE | VA |
| — | 540-599 | none assigned yet which blocks → | UNITED STATES CELLULAR - VA | 6283 | PEARISBURG | VA |
| — | 540-616 | 0XXX1XXX2XXX3XXX · 2 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | DUBLIN | VA |
| — | 540-871 | 2XXX which blocks → | UNITED STATES CELLULAR - VA | 6283 | BEDFORD | VA |
| — | 540-874 | 1XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | BEDFORD | VA |
| — | 540-875 | 0XXX1XXX2XXX3XXX4XXX5XXX · 5 holders which blocks → | UNITED STATES CELLULAR - VA | 6283 | BEDFORD | VA |
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.