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 |
|---|---|---|---|---|---|---|
| 2009-09-17 | 518-305 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | BALLSTNSPA | NY |
| 2006-06-27 | 518-944 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ALBANY | NY |
| 2005-08-02 | 518-820 | 0XXX2XXX3XXX6XXX7XXX · 5 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | CORINTH | NY |
| 2004-08-13 | 518-701 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ALBANY | NY |
| 2003-03-14 | 518-810 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ALBANY | NY |
| — | 518-213 | 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | COLONIE | NY |
| — | 518-420 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | PLATTSBG | NY |
| — | 518-429 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ALBANY | NY |
| — | 518-567 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | HUDSON | NY |
| — | 518-608 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | COLONIE | NY |
| — | 518-637 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | LAKEPLACID | NY |
| — | 518-640 | 1XXX2XXX3XXX5XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | COLONIE | NY |
| — | 518-641 | 1XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ALBANY | NY |
| — | 518-738 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | COLONIE | NY |
| — | 518-819 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | CATSKILL | NY |
| — | 518-839 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | AMSTERDAM | NY |
| — | 518-855 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | GREENWICH | NY |
| — | 518-880 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | TROY | NY |
| — | 518-881 | 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | SCHENCTADY | NY |
| — | 518-886 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | SARATOGSPG | NY |
| — | 518-932 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | GLENSFALLS | NY |
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.