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 |
|---|---|---|---|---|---|---|
| — | 617-205 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | BOSTON | MA |
| — | 617-317 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | QUINCY | MA |
| — | 617-400 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | ROXBURY | MA |
| — | 617-601 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | EVERETT | MA |
| — | 617-677 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | BROOKLINE | MA |
| — | 617-707 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | DORCHESTER | MA |
| — | 617-836 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | CAMBRIDGE | MA |
| — | 617-853 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | NEWTON | MA |
| — | 617-891 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | BRIGHTON | MA |
| — | 617-907 | not yet reported which blocks → | NORFOLK COUNTY INTERNET, INC. | 6083 | MILTON | MA |
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.