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 |
|---|---|---|---|---|---|---|
| 2007-05-21 | 724-201 | 0–9 XXXall 10 · 5 holders which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | ELLWOOD CY | PA |
| 2007-04-20 | 724-232 | 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | EAST BRADY | PA |
| 2007-03-29 | 724-629 | not yet reported which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | WESTFORD | PA |
| 2006-09-27 | 724-841 | 0–9 XXXall 10 · 3 holders which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | BUTLER | PA |
| 2006-06-15 | 724-921 | 0XXX1XXX2XXX · 3 holders which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | IMPERIAL | PA |
| 2006-04-05 | 724-768 | 0–9 XXXall 10 · 7 holders which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | CURTISVL | PA |
| 2005-04-01 | 724-849 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | ARMSTRONG TELECOMMUNICATIONS, INC. - PA | 422C | MAMMOTH | PA |
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.