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 |
|---|---|---|---|---|---|---|
| 2017-01-27 | 518-448 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | GLOVERSVL | NY |
| 2016-10-04 | 518-901 | 0–9 XXXall 10 · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | SCHENCTADY | NY |
| 2014-10-21 | 518-741 | 0–9 XXXall 10 · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | GLENSFALLS | NY |
| 2014-02-11 | 518-930 | 0–9 XXXall 10 · 7 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | SCHENCTADY | NY |
| 2011-05-20 | 518-544 | 0–9 XXXall 10 · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | SUMMIT | NY |
| 2010-10-06 | 518-400 | 0–9 XXXall 10 · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | ROUND LAKE | NY |
| 2010-10-06 | 518-403 | 0XXX1XXX4XXX5XXX7XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | LK LUZERNE | NY |
| 2010-09-07 | 518-333 | 0–9 XXXall 10 · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | FTCOVINGTN | NY |
| 2010-07-07 | 518-319 | 0–9 XXXall 10 · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | MALONE | NY |
| 2007-05-17 | 518-938 | 1XXX9XXX · 2 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CHATHAM | NY |
| — | 518-201 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | PAULSMITHS | NY |
| — | 518-204 | 1XXX4XXX5XXX9XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | MOOERS | NY |
| — | 518-206 | 1XXX4XXX5XXX9XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | ROUSES PT | NY |
| — | 518-208 | 1XXX2XXX4XXX7XXX9XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CHAMPLAIN | NY |
| — | 518-214 | 1XXX4XXX · 2 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | ROTERDMJCT | NY |
| — | 518-215 | 0XXX1XXX4XXX5XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CHAZY | NY |
| — | 518-216 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CROWNPOINT | NY |
| — | 518-309 | 0–9 XXXall 10 · 7 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | BALLSTNSPA | NY |
| — | 518-504 | 0–9 XXXall 10 · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | WARRENSBG | NY |
| — | 518-604 | 0XXX1XXX4XXX6XXX7XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CAROGALAKE | NY |
| — | 518-613 | 0XXX1XXX4XXX7XXX9XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | MAYFIELD | NY |
| — | 518-630 | 0–9 XXXall 10 · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | SCHENCTADY | NY |
| — | 518-702 | 0XXX2XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | MIDDLEBG | NY |
| — | 518-778 | 0XXX1XXX4XXX8XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | WEST CHAZY | NY |
| — | 518-803 | 0XXX1XXX2XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CHESTERTN | NY |
| — | 518-826 | 0XXX4XXX · 2 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | BRAMANVL | NY |
| — | 518-931 | 0XXX1XXX4XXX6XXX9XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | NASSAU | 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.