NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 573
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-08-05 | 573-372-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | GRAVOIS ML | MO |
| 2013-02-05 | 573-664-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | FARMINGTON | MO |
| 2010-11-17 | 573-755-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | JACKSON | MO |
| 2009-09-23 | 573-519-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | CAPEGIRARD | MO |
| 2009-01-07 | 573-343-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | PUXICO | MO |
| 2008-07-21 | 573-629-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HANNIBAL | MO |
| 2007-12-03 | 573-629-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HANNIBAL | MO |
| 2007-02-27 | 573-705-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | FARMINGTON | MO |
| 2006-03-30 | 573-878-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | BEAUFORT | MO |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.