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 |
|---|---|---|---|---|---|---|
| 2007-06-27 | 630-630 | 0–9 XXXwhole prefix which blocks → | FIRST COMMUNICATIONS, LLC | 460K | OSWEGO | IL |
| 2005-02-28 | 630-952 | 0–9 XXXwhole prefix which blocks → | FIRST COMMUNICATIONS, LLC | 460K | AURORA | IL |
| 2004-05-24 | 630-967 | 0–9 XXXall 10 · 2 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | DOWNERSGRV | IL |
| 2004-05-21 | 630-957 | 0–9 XXXall 10 · 4 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | W CHICAGO | IL |
| 2001-04-11 | 630-636 | 0–9 XXXall 10 · 5 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | OSWEGO | IL |
| — | 630-273 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | PLANO | IL |
| — | 630-387 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | ELBURN | IL |
| — | 630-528 | 0–9 XXXall 10 · 3 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | HINSDALE | IL |
| — | 630-614 | 1XXX4XXX · 2 holders which blocks → | FIRST COMMUNICATIONS, LLC | 460K | WHEATON | IL |
| — | 630-615 | 0XXX1XXX8XXX9XXX which blocks → | FIRST COMMUNICATIONS, LLC | 460K | NAPERVILLE | IL |
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.