NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| 2011-09-22 | 717-736 | 0–9 XXXall 10 · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | HARISBGZN1 | PA |
| 2011-06-16 | 717-287 | 0–9 XXXall 10 · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | ELIZABTHTN | PA |
| 2010-03-26 | 717-205 | 0–9 XXXall 10 · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | LANCASTER | PA |
| 2008-04-10 | 717-559 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | DAUPHIN | PA |
| 2003-02-18 | 717-662 | not yet reported which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | MOUNTVILLE | PA |
| 2003-01-29 | 717-544 | 0–9 XXXwhole prefix which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | LANCASTER | PA |
| 2001-09-14 | 717-628 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | MYERSTOWN | PA |
| 2001-05-16 | 717-220 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | HUMMELSTN | PA |
| 2001-05-04 | 717-298 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | HERSHEY | PA |
| 2001-02-28 | 717-842 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | MILLERSVL | PA |
| — | 717-321 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | GETTYSBURG | PA |
| — | 717-524 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | HANOVER | PA |
| — | 717-537 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | LANDISVL | PA |
| — | 717-620 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | MECHANCSBG | PA |
| — | 717-635 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | HARISBGZN1 | PA |
| — | 717-675 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | LEBANON | PA |
| — | 717-713 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | CARLISLE | PA |
| — | 717-735 | 9XXX which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | LANCASTER | PA |
| — | 717-825 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | YORK | PA |
| — | 717-928 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | MOUNT JOY | PA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.