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 |
|---|---|---|---|---|---|---|
| — | 817-204 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FORT WORTH | TX |
| — | 817-205 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FORT WORTH | TX |
| — | 817-208 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FORT WORTH | TX |
| — | 817-209 | 4XXX5XXX7XXX8XXX9XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ARLINGTON | TX |
| — | 817-301 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ARLINGTON | TX |
| — | 817-322 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | KELLER | TX |
| — | 817-362 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | EULESS | TX |
| — | 817-365 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FORT WORTH | TX |
| — | 817-369 | 3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | NRICHLDHLS | TX |
| — | 817-380 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | KELLER | TX |
| — | 817-397 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | KELLER | TX |
| — | 817-398 | 3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | NRICHLDHLS | TX |
| — | 817-463 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FORT WORTH | TX |
| — | 817-464 | 8XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ROANOKE | TX |
| — | 817-486 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | GRAPEVINE | TX |
| — | 817-497 | 8XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ROANOKE | TX |
| — | 817-544 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | GRAPEVINE | TX |
| — | 817-627 | 4XXX5XXX7XXX8XXX9XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ARLINGTON | TX |
| — | 817-642 | 5XXX7XXX8XXX9XXX · 3 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ARLINGTON | TX |
| — | 817-643 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | EULESS | TX |
| — | 817-644 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FORT WORTH | TX |
| — | 817-734 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | GLENDALE | TX |
| — | 817-809 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | GRAPEVINE | TX |
| — | 817-836 | not yet reported which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | EULESS | TX |
| — | 817-914 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ARLINGTON | 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.