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 |
|---|---|---|---|---|---|---|
| 2004-10-13 | 215-253 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| 2002-11-15 | 215-240 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN2 | PA |
| 2002-02-27 | 215-989 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| — | 215-310 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MORRISVL | PA |
| — | 215-325 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN39 | PA |
| — | 215-366 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN38 | PA |
| — | 215-371 | 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN33 | PA |
| — | 215-525 | 0XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| — | 215-539 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN43 | PA |
| — | 215-544 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN37 | PA |
| — | 215-600 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| — | 215-687 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| — | 215-701 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| — | 215-774 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN32 | PA |
| — | 215-780 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN34 | PA |
| — | 215-791 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN40 | PA |
| — | 215-798 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN45 | PA |
| — | 215-821 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN4 | PA |
| — | 215-853 | 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | LANSDALE | PA |
| — | 215-857 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BEDMINSTER | PA |
| — | 215-929 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN41 | PA |
| — | 215-965 | 6XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN1 | PA |
| — | 215-966 | 0XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN2 | PA |
| — | 215-967 | 2XXX3XXX8XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHLDLPHZN3 | 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.