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 |
|---|---|---|---|---|---|---|
| 2019-12-24 | 208-510 | 0–9 XXXall 10 · 5 holders which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. - ID | 3816 | BOISE | ID |
| 2009-12-17 | 208-814 | 0–9 XXXwhole prefix which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. - ID | 3816 | TWIN FALLS | ID |
| 2003-03-13 | 208-933 | 0XXX5XXX6XXX8XXX · 4 holders which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. - ID | 3816 | TWIN FALLS | ID |
| — | 208-434 | none assigned yet which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. | 2231 | RUPERT | ID |
| — | 208-436 | not yet reported which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. | 2231 | RUPERT | ID |
| — | 208-438 | not yet reported which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. | 2231 | PAUL | ID |
| — | 208-531 | not yet reported which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. | 2231 | MINIDOKA | ID |
| — | 208-532 | not yet reported which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. | 2231 | NORLAND | ID |
| — | 208-679 | 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. - ID | 3816 | BURLEY | ID |
| — | 208-862 | not yet reported which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. | 2231 | OAKLEY | ID |
| — | 208-878 | not yet reported which blocks → | PROJECT MUTUAL TEL. COOP. ASSN., INC. - ID | 3816 | BURLEY | ID |
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.