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 |
|---|---|---|---|---|---|---|
| 2014-02-03 | 903-492 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | QUITMAN | TX |
| 2014-02-03 | 903-608 | 0XXX1XXX3XXX4XXX6XXX9XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | TLSVNPONTS | TX |
| 2014-01-31 | 903-605 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | LONE STAR | TX |
| 2014-01-31 | 903-800 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | DAINGERFLD | TX |
| 2014-01-29 | 903-919 | 0–9 XXXall 10 · 6 holders which blocks → | CSC VOICE, LLC | 612K | SULPHURSPG | TX |
| 2013-11-05 | 903-630 | 0–9 XXXall 10 · 3 holders which blocks → | CSC VOICE, LLC | 612K | TYLER | TX |
| 2013-11-05 | 903-706 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | PARIS | TX |
| 2013-11-05 | 903-904 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | ATHENS | TX |
| — | 903-205 | 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | DAINGERFLD | TX |
| — | 903-270 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | MT VERNON | TX |
| — | 903-310 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | HUGHES SPG | TX |
| — | 903-320 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | CSC VOICE, LLC | 612K | LONE STAR | TX |
| — | 903-321 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | CSC VOICE, LLC | 612K | LKPALSTINE | TX |
| — | 903-339 | 0–9 XXXall 10 · 5 holders which blocks → | CSC VOICE, LLC | 612K | JACKSONVL | TX |
| — | 903-707 | 0–9 XXXall 10 · 4 holders which blocks → | CSC VOICE, LLC | 612K | TYLER | TX |
| — | 903-710 | 1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → | CSC VOICE, LLC | 612K | BULLARD | TX |
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.