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.
Most active assignees, all time — NPA 610
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 610-410 | 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CENTER PT | PA |
| — | 610-425 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | W CHESTER | PA |
| — | 610-450 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | EXTON | PA |
| — | 610-480 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN12 | PA |
| — | 610-579 | 0XXX1XXX2XXX6XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN10 | PA |
| — | 610-590 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CHESTERSPG | PA |
| — | 610-596 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CATASAUQUA | PA |
| — | 610-598 | 0XXX4XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BOWMANSTN | PA |
| — | 610-619 | 1XXX2XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN11 | PA |
| — | 610-621 | 0XXX3XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | READING | PA |
| — | 610-628 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | ALLENTOWN | PA |
| — | 610-638 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN17 | PA |
| — | 610-665 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN29 | PA |
| — | 610-680 | 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN30 | PA |
| — | 610-699 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN28 | PA |
| — | 610-717 | 2XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN10 | PA |
| — | 610-723 | 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN22 | PA |
| — | 610-757 | 0XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN30 | PA |
| — | 610-765 | 0XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | KENNETT SQ | PA |
| — | 610-785 | 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN23 | PA |
| — | 610-788 | 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN26 | PA |
| — | 610-795 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN24 | PA |
| — | 610-801 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN25 | PA |
| — | 610-818 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN31 | PA |
| — | 610-849 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BETHLEHEM | PA |
| — | 610-860 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN21 | PA |
| — | 610-871 | none assigned yet which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | ALLENTOWN | PA |
| — | 610-879 | 0XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN30 | PA |
| — | 610-895 | 0XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | KUNKLETOWN | PA |
| — | 610-900 | 0XXX1XXX4XXX6XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PALMERTON | PA |
| — | 610-906 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | POTTSTOWN | PA |
| — | 610-910 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | AVONDALE | PA |
| — | 610-938 | 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN13 | PA |
| — | 610-943 | 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN31 | PA |
| — | 610-951 | 0XXX1XXX4XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | KRESGEVL | PA |
| — | 610-957 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN14 | 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.