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 |
|---|---|---|---|---|---|---|
| 2007-05-02 | 512-938 | 0–9 XXXall 10 · 6 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | SAN MARCOS | TX |
| — | 512-220 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | AUSTIN | TX |
| — | 512-240 | 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | GEORGETOWN | TX |
| — | 512-504 | 3XXX6XXX7XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | KYLE | TX |
| — | 512-523 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | BUDA | TX |
| — | 512-524 | 3XXX6XXX7XXX9XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | AUSTIN | TX |
| — | 512-538 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | AUSTIN | TX |
| — | 512-546 | 3XXX6XXX7XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | DALE/LTNSP | TX |
| — | 512-600 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | AUSTIN | TX |
| — | 512-607 | 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | DRIPPNGSPG | TX |
| — | 512-628 | 3XXX6XXX7XXX9XXX · 2 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | AUSTIN | TX |
| — | 512-642 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | HUTTO | TX |
| — | 512-722 | 3XXX6XXX7XXX9XXX · 4 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | WIMBERLEY | TX |
| — | 512-878 | 3XXX6XXX7XXX9XXX · 2 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | SAN MARCOS | 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.