NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026
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 |
|---|---|---|---|---|---|---|
| — | 610-351 | not yet reported which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | ALLENTOWN | PA |
| — | 610-365 | 1XXX3XXX4XXX7XXX · 3 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | NAZARETH | PA |
| — | 610-419 | 5XXX7XXX which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | BETHLEHEM | PA |
| — | 610-421 | 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | EMMAUS | PA |
| — | 610-438 | 7XXX which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | EASTON | PA |
| — | 610-440 | 3XXX4XXX7XXX · 2 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | NORTHAMPTN | PA |
| — | 610-441 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | W CHESTER | PA |
| — | 610-443 | 4XXX which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | CATASAUQUA | PA |
| — | 610-677 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | PHPHSBZN23 | PA |
| — | 610-787 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | PHPHSBZN30 | PA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.