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 |
|---|---|---|---|---|---|---|
| 2015-06-30 | 681-477 | 0XXX1XXX2XXX4XXX5XXX7XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | FLEMINGTON | WV |
| 2015-06-30 | 681-525 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | CSC VOICE, LLC | 612K | FARMINGTON | WV |
| 2014-01-28 | 681-291 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → | CSC VOICE, LLC | 612K | RAINELLE | WV |
| 2014-01-28 | 681-318 | 0–9 XXXall 10 · 7 holders which blocks → | CSC VOICE, LLC | 612K | LEWISBURG | WV |
| 2014-01-28 | 681-400 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | WHITESVL | WV |
| 2014-01-28 | 681-422 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | MOUNT HOPE | WV |
| 2014-01-28 | 681-539 | 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | SOPHIA | WV |
| 2014-01-28 | 681-612 | 0–9 XXXall 10 · 8 holders which blocks → | CSC VOICE, LLC | 612K | ST MARYS | WV |
| 2014-01-28 | 681-731 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | CSC VOICE, LLC | 612K | MILL CREEK | WV |
| 2014-01-27 | 681-233 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | HURRICANE | WV |
| 2014-01-27 | 681-459 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | GLENDANIEL | WV |
| 2014-01-27 | 681-735 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | KERMIT | WV |
| 2014-01-24 | 681-236 | 0XXX1XXX2XXX5XXX8XXX9XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | ELIZABETH | WV |
| 2014-01-24 | 681-416 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → | CSC VOICE, LLC | 612K | DELBARTON | WV |
| 2014-01-22 | 681-217 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | CHRLSTNZN6 | WV |
| 2013-11-26 | 681-298 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | ELKINS | WV |
| 2013-10-23 | 681-265 | 0–9 XXXwhole prefix which blocks → | CSC VOICE, LLC | 612K | CHRLSTNZN1 | WV |
| 2013-10-23 | 681-282 | 0XXX1XXX5XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | PRINCETON | WV |
| 2013-09-10 | 681-675 | 2XXX5XXX7XXX8XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | LETART | WV |
| 2013-07-29 | 681-262 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | RUPERT | WV |
| 2013-07-29 | 681-515 | 2XXX5XXX7XXX · 3 holders which blocks → | CSC VOICE, LLC | 612K | NEW HAVEN | WV |
| — | 681-221 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | EAST BANK | WV |
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.