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 |
|---|---|---|---|---|---|---|
| — | 412-224 | 0–9 XXXall 10 · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON1 | PA |
| — | 412-283 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN12 | PA |
| — | 412-324 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN16 | PA |
| — | 412-325 | not yet reported which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON1 | PA |
| — | 412-423 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN20 | PA |
| — | 412-455 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN19 | PA |
| — | 412-457 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN22 | PA |
| — | 412-459 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON2 | PA |
| — | 412-539 | 2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON7 | PA |
| — | 412-684 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN18 | PA |
| — | 412-696 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON3 | PA |
| — | 412-712 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN21 | PA |
| — | 412-722 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN14 | PA |
| — | 412-729 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | ELIZABETH | PA |
| — | 412-838 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN13 | PA |
| — | 412-847 | 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN17 | PA |
| — | 412-865 | 5XXX6XXX7XXX8XXX9XXX which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN15 | PA |
| — | 412-924 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON8 | PA |
| — | 412-942 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTTSBGZON6 | PA |
| — | 412-943 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN11 | PA |
| — | 412-948 | 4XXX5XXX6XXX7XXX · 3 holders which blocks → | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN10 | 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.