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 |
|---|---|---|---|---|---|---|
| 2012-02-13 | 570-536 | 0–9 XXXall 10 · 5 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | CARBONDALE | PA |
| 2010-01-21 | 570-583 | 0XXX2XXX3XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | PORTLAND | PA |
| 2008-10-21 | 570-859 | 1XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | SHENANDOAH | PA |
| 2008-05-28 | 570-734 | 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | LAKEWOOD | PA |
| 2008-04-17 | 570-626 | 0XXX1XXX2XXX3XXX4XXX6XXX · 4 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | TREVORTON | PA |
| 2008-04-17 | 570-920 | 0XXX6XXX7XXX · 3 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | MANDATA | PA |
| 2007-11-08 | 570-834 | 3XXX5XXX8XXX · 3 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | VALLEYVIEW | PA |
| 2007-05-10 | 570-741 | 4XXX5XXX6XXX7XXX · 2 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | RINGTOWN | PA |
| 2007-05-10 | 570-816 | 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | MIFFLINBG | PA |
| 2007-05-10 | 570-987 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 8 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | NUREMBERG | PA |
| 2005-06-10 | 570-701 | 0–9 XXXall 10 · 8 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | NORTHUBRLD | PA |
| 2004-11-23 | 570-369 | 0–9 XXXall 10 · 4 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | STROUDSBG | 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.