NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| — | 223-317 | 0XXX1XXX2XXX3XXX9XXX · 2 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | MANCHESTER | PA |
| — | 223-333 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - PA | 547E | LEBANON | PA |
| — | 223-411 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | PA | |
| — | 223-511 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | PA | |
| — | 223-555 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | DIR ASST | PA |
| — | 223-563 | 0XXX4XXX5XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MARION | PA |
| — | 223-570 | not yet reported which blocks → | PA | |||
| — | 223-611 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | PA | |
| — | 223-700 | not yet reported which blocks → | PA | |||
| — | 223-711 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | PA | |
| — | 223-717 | not yet reported which blocks → | PA | |||
| — | 223-811 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | PA | |
| — | 223-888 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY, LLC - PA | 547E | HALIFAX | PA |
| — | 223-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | PA | |
| — | 223-950 | not yet reported which blocks → | PA | |||
| — | 223-958 | not yet reported which blocks → | PA | |||
| — | 223-959 | not yet reported which blocks → | PA | |||
| — | 223-976 | not yet reported which blocks → | PA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.