NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026
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 |
|---|---|---|---|---|---|---|
| 2002-02-14 | 936-228 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | WILLIS | TX |
| — | 936-262 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | BATSON | TX |
| — | 936-274 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | SARATOGA | TX |
| — | 936-298 | 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | HARDIN | TX |
| — | 936-344 | 1XXX3XXX4XXX5XXX · 2 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | NEWWAVERLY | TX |
| — | 936-536 | 0XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | HULL | TX |
| — | 936-549 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | DEVERS | TX |
| — | 936-587 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | RAYWOOD | TX |
| — | 936-628 | 0XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | SHEPHERD | TX |
| — | 936-856 | not yet reported which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | WILLIS | TX |
| — | 936-890 | not yet reported which blocks → | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | WILLIS | TX |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.