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 |
|---|---|---|---|---|---|---|
| 2018-06-06 | 610-215 | 0–9 XXXall 10 · 6 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | PHPHSBZN30 | PA |
| 2009-03-12 | 610-214 | 0–9 XXXall 10 · 6 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | COOPERSBG | PA |
| 2009-03-12 | 610-735 | 0–9 XXXall 10 · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | IRONTON | PA |
| 2001-03-21 | 610-200 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | PHPHSBZN14 | PA |
| 2001-03-21 | 610-300 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | PHOENIXVL | PA |
| 2001-03-21 | 610-301 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | READING | PA |
| 2001-03-21 | 610-400 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | COATESVL | PA |
| 2001-03-21 | 610-510 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | RIEGELSVL | PA |
| 2001-03-21 | 610-600 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | UPBLCKEDDY | PA |
| 2001-03-21 | 610-810 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | EASTON | PA |
| 2001-03-21 | 610-844 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | ALLENTOWN | PA |
| 2001-03-21 | 610-955 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | PHPHSBZN30 | PA |
| 2001-03-21 | 610-990 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | PHPHSBZN11 | PA |
| — | 610-516 | 0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | LENAPE | PA |
| — | 610-839 | 0–9 XXXall 10 · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | BATH | 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.