NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2024-03-25 | 870-969 | 2XXX9XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | ROE | AR |
| 2023-08-23 | 870-928 | 0XXX1XXX2XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | CAVE CITY | AR |
| 2022-10-17 | 870-965 | 0XXX1XXX8XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | CASH | AR |
| 2014-01-03 | 870-402 | 3XXX which blocks → | CSC VOICE, LLC | 612K | MIDWAY | AR |
| 2014-01-03 | 870-407 | 1XXX4XXX7XXX8XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | MARVELL | AR |
| 2014-01-03 | 870-470 | 4XXX7XXX8XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | MALLARD PT | AR |
| 2014-01-03 | 870-707 | 1XXX7XXX8XXX9XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | LAKEVIEW | AR |
| 2014-01-03 | 870-708 | 3XXX8XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | WALDO | AR |
| 2014-01-03 | 870-803 | 1XXX3XXX4XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | BAY | AR |
| 2013-11-15 | 870-808 | 0XXX4XXX5XXX8XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | TUCKERMAN | AR |
| 2013-11-08 | 870-701 | 0XXX1XXX3XXX4XXX5XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | MT HOME | AR |
| 2013-10-29 | 870-444 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | EL DORADO | AR |
| 2013-10-29 | 870-520 | 0–9 XXXall 10 · 3 holders which blocks → | CSC VOICE, LLC | 612K | JONESBORO | AR |
| — | 870-507 | 5XXX6XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | MIDWAY | AR |
| — | 870-524 | 2XXX6XXX8XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | WALDO | AR |
| — | 870-580 | 5XXX6XXX9XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | MT HOME | AR |
| — | 870-607 | none assigned yet which blocks → | CSC VOICE, LLC | 612K | MALLARD PT | AR |
| — | 870-609 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CSC VOICE, LLC | 612K | POCAHONTAS | AR |
| — | 870-620 | 2XXX3XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | LAKEVIEW | AR |
| — | 870-728 | 6XXX which blocks → | CSC VOICE, LLC | 612K | MARVELL | AR |
| — | 870-770 | 1XXX3XXX4XXX5XXX7XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | BAY | AR |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.