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 |
|---|---|---|---|---|---|---|
| — | 310-232 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-236 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-238 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-239 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-240 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-249 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-250 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-262 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-298 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-368 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-501 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN CMTN | CA |
| — | 310-509 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN CMTN | CA |
| — | 310-585 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-588 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-685 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-716 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-718 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-723 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-790 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-805 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-875 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
| — | 310-932 | not yet reported which blocks → | SPOK, INC. | 6630 | LAKEWOOD | CA |
| — | 310-960 | not yet reported which blocks → | SPOK, INC. | 6630 | CMTN GRDN | CA |
| — | 310-992 | not yet reported which blocks → | SPOK, INC. | 6630 | SNMN SNMN | CA |
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.