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 |
|---|---|---|---|---|---|---|
| — | 972-212 | 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PLANO | TX |
| — | 972-215 | 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | IRVING | TX |
| — | 972-220 | 8XXX9XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | DALLAS | TX |
| — | 972-300 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | CARROLLTON | TX |
| — | 972-363 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | MCKINNEY | TX |
| — | 972-384 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PLANO | TX |
| — | 972-410 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | LEWISVILLE | TX |
| — | 972-508 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PROSPER | TX |
| — | 972-549 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | MCKINNEY | TX |
| — | 972-553 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PLANO | TX |
| — | 972-651 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ROCKWALL | TX |
| — | 972-668 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FRISCO | TX |
| — | 972-678 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ALLEN | TX |
| — | 972-826 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PLANO | TX |
| — | 972-847 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | DALLAS | TX |
| — | 972-865 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | DALLAS | TX |
| — | 972-886 | 5XXX8XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | MCKINNEY | TX |
| — | 972-899 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | LEWISVILLE | TX |
| — | 972-912 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ALLEN | 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.