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 |
|---|---|---|---|---|---|---|
| 2022-07-27 | 301-635 | 0–9 XXXall 10 · 2 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSHNGTNZN5 | MD |
| 2011-02-24 | 301-200 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | INDIANHEAD | MD |
| — | 301-615 | not yet reported which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG236Z13 | MD |
| — | 301-671 | not yet reported which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | HAGERSTOWN | MD |
| — | 301-701 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG236Z13 | MD |
| — | 301-783 | not yet reported which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | CUMBERLAND | MD |
| — | 301-818 | not yet reported which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WALDORF | MD |
| — | 301-849 | not yet reported which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | OAKLAND | MD |
| — | 301-886 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG236Z13 | MD |
| — | 301-923 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG236Z13 | MD |
| — | 301-973 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG238Z14 | MD |
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.