NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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.
Most active assignees, all time — NPA 713
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 713-200 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-279 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-288 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-310 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-318 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-326 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-327 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-404 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-406 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-415 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-506 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-508 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-509 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-549 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-593 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-601 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-603 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-604 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-605 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-606 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-607 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-608 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-616 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-617 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-618 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-619 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-642 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-648 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-687 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-698 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-707 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-708 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-709 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-710 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-712 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-716 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-717 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-719 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-720 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-736 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-760 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-761 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-762 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-763 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-764 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-765 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-768 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-786 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-801 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
| — | 713-809 | not yet reported which blocks → | SPOK, INC. | 6630 | HOUSTON | TX |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.