NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2022-10-12 | 516-475 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN08 | NY |
| 2014-09-26 | 516-727 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN02 | NY |
| 2005-03-16 | 516-858 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN01 | NY |
| 2005-03-14 | 516-232 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN02 | NY |
| 2005-03-14 | 516-726 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN01 | NY |
| 2005-02-22 | 516-673 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN02 | NY |
| — | 516-261 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN08 | NY |
| — | 516-345 | 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN06 | NY |
| — | 516-417 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN05 | NY |
| — | 516-452 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | FARMINGDL | NY |
| — | 516-549 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN02 | NY |
| — | 516-558 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN07 | NY |
| — | 516-570 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN01 | NY |
| — | 516-620 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN05 | NY |
| — | 516-687 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN01 | NY |
| — | 516-750 | 5XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN05 | NY |
| — | 516-813 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN08 | NY |
| — | 516-874 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN05 | NY |
| — | 516-913 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | NASSAUZN05 | NY |
| — | 516-986 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | FARMINGDL | NY |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.