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 |
|---|---|---|---|---|---|---|
| 2008-06-11 | 610-556 | 0XXX2XXX5XXX6XXX7XXX · 5 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | UHLERSTOWN | PA |
| 2007-05-10 | 610-493 | 2XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | OLEY | PA |
| 2007-05-10 | 610-575 | 2XXX3XXX6XXX7XXX9XXX · 3 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | BIRDSBORO | PA |
| 2007-05-10 | 610-875 | 6XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | GREENHILLS | PA |
| 2007-05-10 | 610-899 | 2XXX8XXX · 2 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | TOPTON | PA |
| 2007-05-10 | 610-919 | 2XXX9XXX · 2 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | YELLOW HS | PA |
| 2007-05-10 | 610-953 | 1XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | DOUGLASSVL | PA |
| 2007-05-01 | 610-901 | 0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | MORGANTOWN | PA |
| 2007-04-30 | 610-302 | 0–9 XXXall 10 · 2 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | BOYERTOWN | PA |
| 2007-04-30 | 610-652 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | SASSAMNSVL | PA |
| 2007-04-30 | 610-702 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | BALLY | PA |
| 2002-02-13 | 610-452 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | BANGOR | PA |
| 2002-02-13 | 610-654 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | PEN ARGYL | PA |
| 2001-03-19 | 610-224 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | SLATINGTON | PA |
| — | 610-403 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | CATASAUQUA | PA |
| — | 610-625 | 1XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | BETHLEHEM | PA |
| — | 610-697 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | NORTHAMPTN | PA |
| — | 610-748 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | HELLERTOWN | PA |
| — | 610-829 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | EASTON | PA |
| — | 610-841 | 6XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | ALLENTOWN | PA |
| — | 610-928 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | EMMAUS | 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.