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 |
|---|---|---|---|---|---|---|
| 2022-03-23 | 667-622 | 0–9 XXXall 10 · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | PIKESVILLE | MD |
| 2022-03-23 | 667-693 | 7XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | VIENNA | MD |
| 2022-03-14 | 667-827 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BERLIN | MD |
| 2022-03-09 | 667-743 | 0XXX1XXX7XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | QUEENSTOWN | MD |
| 2022-03-04 | 667-483 | 7XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | DEALISLAND | MD |
| 2022-03-03 | 667-526 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CENTREVL | MD |
| 2022-03-01 | 667-446 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ELKRIDGE | MD |
| 2022-03-01 | 667-468 | 6XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | NANTICOKE | MD |
| 2022-03-01 | 667-626 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CATONSVL | MD |
| 2022-03-01 | 667-737 | 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | PERRYVILLE | MD |
| 2022-03-01 | 667-856 | 0–9 XXXall 10 · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | DUNDALK | MD |
| 2022-02-24 | 667-466 | 1XXX3XXX9XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | HAVREGRACE | MD |
| 2022-02-24 | 667-746 | 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | GLENWOOD | MD |
| 2022-02-24 | 667-832 | 0–9 XXXall 10 · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BRYNPKLNCM | MD |
| 2022-02-24 | 667-846 | 0–9 XXXall 10 · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | COCKEYSVL | MD |
| 2022-02-07 | 667-942 | 0–9 XXXall 10 · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ABERDEEN | MD |
| 2022-01-28 | 667-464 | 0–9 XXXall 10 · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BALTIMORE | MD |
| 2022-01-13 | 667-824 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | EDGEWOOD | MD |
| 2021-05-07 | 667-365 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CHESAPKECY | MD |
| 2021-03-18 | 667-848 | 0–9 XXXall 10 · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ABERDEEN | MD |
| 2021-02-11 | 667-646 | 0–9 XXXall 10 · 5 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ANNAPOLIS | 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.