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 |
|---|---|---|---|---|---|---|
| 2015-07-16 | 845-324 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | WARWICK | NY |
| 2015-05-21 | 845-273 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | HIGHLANDML | NY |
| 2014-03-26 | 845-643 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | CSC VOICE, LLC | 612K | NYACK | NY |
| 2010-06-29 | 845-232 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | POUGHKEPSI | NY |
| 2010-03-02 | 845-204 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | POUGHKEPSI | NY |
| 2008-06-11 | 845-447 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | HOPEWLLJCT | NY |
| 2006-09-18 | 845-517 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | SPRING VLY | NY |
| 2004-08-20 | 845-209 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | ELIZAVILLE | NY |
| 2004-08-20 | 845-360 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | GOSHEN | NY |
| 2004-08-20 | 845-412 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | OTISVILLE | NY |
| 2004-08-20 | 845-508 | 0XXX1XXX3XXX6XXX9XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | FLORIDA | NY |
| 2004-08-20 | 845-683 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | UNIONVILLE | NY |
| 2004-08-20 | 845-697 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | CSC VOICE, LLC | 612K | SLATE HILL | NY |
| 2004-08-20 | 845-713 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | WALDEN | NY |
| 2004-08-20 | 845-769 | 0–9 XXXall 10 · 8 holders which blocks → | CSC VOICE, LLC | 612K | MONTGOMERY | NY |
| 2004-08-20 | 845-773 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | CSC VOICE, LLC | 612K | STAATSBURG | NY |
| 2004-08-20 | 845-827 | 0–9 XXXall 10 · 7 holders which blocks → | CSC VOICE, LLC | 612K | HIGHLANDML | NY |
| 2004-08-20 | 845-835 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | RED HOOK | NY |
| 2004-08-20 | 845-851 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CSC VOICE, LLC | 612K | WALLKILL | NY |
| 2004-08-20 | 845-981 | 0XXX1XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → | CSC VOICE, LLC | 612K | PINEISLAND | NY |
| 2004-07-23 | 845-632 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | WAPIGRSFLS | NY |
| 2004-06-03 | 845-672 | 0–9 XXXall 10 · 8 holders which blocks → | CSC VOICE, LLC | 612K | PORTJERVIS | NY |
| 2004-06-01 | 845-290 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | SPRING VLY | NY |
| — | 845-736 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | PEEKSKILL | NY |
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.