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 |
|---|---|---|---|---|---|---|
| 2012-06-26 | 717-888 | 0–9 XXXall 10 · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | HARISBGZN1 | PA |
| 2009-03-18 | 717-212 | 0–9 XXXall 10 · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | LEWISBERRY | PA |
| 2009-03-18 | 717-219 | 0–9 XXXall 10 · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | SHELLSVL | PA |
| 2009-03-18 | 717-282 | 0–9 XXXall 10 · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | PORT ROYAL | PA |
| 2009-03-18 | 717-400 | 0–9 XXXall 10 · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | YORK SPG | PA |
| 2009-03-18 | 717-452 | 0–9 XXXall 10 · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | MERCERSBG | PA |
| 2009-03-18 | 717-523 | 0–9 XXXall 10 · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | TOWER CITY | PA |
| 2009-03-18 | 717-539 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | MCALISTRVL | PA |
| 2009-03-18 | 717-631 | 0–9 XXXall 10 · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | RICHFIELD | PA |
| 2009-03-18 | 717-748 | 0–9 XXXall 10 · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | ST THOMAS | PA |
| 2009-03-18 | 717-895 | 0–9 XXXall 10 · 6 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | GREENCASTL | PA |
| 2009-03-18 | 717-922 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | THOMPSONTN | PA |
| 2009-03-18 | 717-946 | 0–9 XXXall 10 · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | REEDSVILLE | PA |
| 2009-03-17 | 717-281 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | EWATERFORD | PA |
| 2009-03-17 | 717-408 | 0–9 XXXall 10 · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | FAIRFIELD | PA |
| 2009-03-17 | 717-493 | 0–9 XXXall 10 · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | DRY RUN | PA |
| 2009-03-16 | 717-402 | 0–9 XXXall 10 · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | BELLEVILLE | PA |
| 2009-03-16 | 717-403 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | ALLENSVL | PA |
| 2002-12-18 | 717-784 | 0–9 XXXwhole prefix which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | MILLERSTN | PA |
| 2002-12-18 | 717-785 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | BLRDGSUMMT | PA |
| 2002-11-26 | 717-557 | 0–9 XXXall 10 · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | HARISBGZN1 | PA |
| 2002-08-08 | 717-745 | 0–9 XXXall 10 · 6 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | HARISBGZN2 | PA |
| — | 717-275 | 0–9 XXXall 10 · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | NEWBLOMFLD | PA |
| — | 717-619 | 0–9 XXXall 10 · 6 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | EASTBERLIN | PA |
| — | 717-905 | 0–9 XXXall 10 · 7 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | ELIZABTHVL | 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.