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 |
|---|---|---|---|---|---|---|
| 2022-07-28 | 512-500 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2014-08-25 | 512-792 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2014-07-03 | 512-640 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2013-06-18 | 512-872 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2013-03-27 | 512-270 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2011-04-20 | 512-265 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | BURNET | TX |
| 2010-12-02 | 512-900 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2008-10-22 | 512-551 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2005-08-03 | 512-788 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| 2005-02-14 | 512-812 | 7XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | MILANO | TX |
| 2003-02-11 | 512-213 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | LOCKHART | TX |
| 2002-08-26 | 512-561 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | MILANO | TX |
| 2002-08-26 | 512-562 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | LOMETA | TX |
| 2002-01-02 | 512-553 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | BURNET | TX |
| 2001-12-11 | 512-595 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | TAYLOR | TX |
| — | 512-271 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| — | 512-351 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | AUSTIN | TX |
| — | 512-456 | 0XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | LEANDER | TX |
| — | 512-686 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | GEORGETOWN | TX |
| — | 512-772 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | BASTROP | TX |
| — | 512-842 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | WIMBERLEY | TX |
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.