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 |
|---|---|---|---|---|---|---|
| 2011-01-06 | 540-603 | 0–9 XXXall 10 · 7 holders which blocks → | PAETEC ITEL, LLC | 829J | LOUISA | VA |
| 2010-05-24 | 540-523 | 0–9 XXXall 10 · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | ROANOKE | VA |
| 2009-05-07 | 540-441 | 0–9 XXXall 10 · 7 holders which blocks → | PAETEC ITEL, LLC | 829J | MT GILEAD | VA |
| 2006-06-21 | 540-597 | 0–9 XXXall 10 · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | ROANOKE | VA |
| 2006-04-05 | 540-317 | 0–9 XXXall 10 · 6 holders which blocks → | PAETEC ITEL, LLC | 829J | CULPEPER | VA |
| 2006-03-24 | 540-318 | 0–9 XXXall 10 · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | STAFFORD | VA |
| 2005-03-17 | 540-604 | 0–9 XXXall 10 · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | FREDECKSBG | VA |
| 2004-04-07 | 540-278 | 0–9 XXXall 10 · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | ROANOKE | VA |
| — | 540-735 | 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | FREDECKSBG | VA |
| — | 540-736 | 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | CHANCELLOR | VA |
| — | 540-737 | 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | HARTWOOD | VA |
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.