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 |
|---|---|---|---|---|---|---|
| 2005-02-01 | 610-340 | 0–9 XXXall 10 · 7 holders which blocks → | PAETEC ITEL, LLC | 829J | POTTSTOWN | PA |
| — | 610-350 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | W CHESTER | PA |
| — | 610-423 | 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | EXTON | PA |
| — | 610-535 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN26 | PA |
| — | 610-577 | 5XXX6XXX7XXX8XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | LEHIGHTON | PA |
| — | 610-684 | 5XXX7XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN31 | PA |
| — | 610-755 | 1XXX2XXX5XXX7XXX8XXX which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN30 | PA |
| — | 610-784 | 1XXX7XXX9XXX which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN23 | PA |
| — | 610-786 | 6XXX7XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN28 | PA |
| — | 610-790 | 3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | READING | PA |
| — | 610-836 | 1XXX2XXX which blocks → | PAETEC ITEL, LLC | 829J | W CHESTER | PA |
| — | 610-843 | 1XXX2XXX4XXX5XXX8XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN28 | PA |
| — | 610-848 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN22 | PA |
| — | 610-854 | 8XXX9XXX which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN28 | PA |
| — | 610-870 | 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN14 | PA |
| — | 610-877 | 1XXX2XXX5XXX6XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN31 | PA |
| — | 610-945 | 4XXX5XXX6XXX7XXX8XXX which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN30 | PA |
| — | 610-961 | 1XXX2XXX5XXX7XXX8XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | KENNETT SQ | PA |
| — | 610-973 | 4XXX5XXX7XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | ALLENTOWN | PA |
| — | 610-994 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN30 | 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.