NumberResearchRecent prefix assignments
4 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| — | 667-411 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MD |
| — | 667-421 | 0–9 XXXall 10 · 5 holders which blocks → | TELNYX LLC | 073H | COLUMBIA | MD |
| — | 667-511 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MD |
| — | 667-542 | not yet reported which blocks → | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | ABERDEEN | MD |
| — | 667-555 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | DIR ASST | MD |
| — | 667-611 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MD |
| — | 667-666 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - MD | 876D | WEST RIVER | MD |
| — | 667-700 | not yet reported which blocks → | MD | |||
| — | 667-711 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MD |
| — | 667-811 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MD |
| — | 667-888 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC - MD | 876D | BALTIMORE | MD |
| — | 667-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MD |
| — | 667-950 | not yet reported which blocks → | MD | |||
| — | 667-958 | not yet reported which blocks → | MD | |||
| — | 667-959 | not yet reported which blocks → | MD | |||
| — | 667-976 | not yet reported which blocks → | MD |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.