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 |
|---|---|---|---|---|---|---|
| 2014-04-04 | 443-808 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | ANNAPOLIS | MD |
| 2014-01-17 | 443-776 | 0–9 XXXall 10 · 7 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELKRIDGE | MD |
| 2011-08-11 | 443-892 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | NEWWINDSOR | MD |
| 2011-02-16 | 443-971 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | TANEYTOWN | MD |
| 2011-02-04 | 443-990 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | BALTIMORE | MD |
| — | 443-266 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | GLENWOOD | MD |
| — | 443-294 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WEST RIVER | MD |
| — | 443-304 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | ARBUTUS | MD |
| — | 443-317 | 2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | CHASE | MD |
| — | 443-390 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | CHURCHVL | MD |
| — | 443-420 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELLICOTTCY | MD |
| — | 443-490 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | EDGEWOOD | MD |
| — | 443-494 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | MILLERSVL | MD |
| — | 443-495 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | PARKVILLE | MD |
| — | 443-499 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | JARRETTSVL | MD |
| — | 443-595 | 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | SPARKSGLNC | MD |
| — | 443-598 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | SHERWD FOR | MD |
| — | 443-963 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | BALTIMORE | 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.