NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| 2017-08-03 | 864-432 | 0–9 XXXall 10 · 3 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 0526 | SIMPSONVL | SC |
| — | 864-228 | 7XXX which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 0526 | SIMPSONVL | SC |
| — | 864-447 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 4335 | CALHOUNFLS | SC |
| — | 864-459 | 1XXX6XXX7XXX · 2 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 4335 | ABBEVILLE | SC |
| — | 864-465 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 4335 | MCCORMICK | SC |
| — | 864-476 | 1XXX4XXX · 2 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 4335 | WOODRUFF | SC |
| — | 864-962 | 3XXX4XXX7XXX · 3 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 0526 | SIMPSONVL | SC |
| — | 864-963 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 0526 | SIMPSONVL | SC |
| — | 864-967 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 0526 | SIMPSONVL | SC |
| — | 864-983 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 4335 | LAURENS | SC |
| — | 864-984 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - SC | 4335 | LAURENS | SC |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.