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 580
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 |
|---|---|---|---|---|---|---|---|
| 2016-08-04 | 580-251-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | DUNCAN | OK |
| 2014-07-22 | 580-222-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | ARDMORE | OK |
| 2010-05-25 | 580-366-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2010-05-25 | 580-366-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2009-04-29 | 580-616-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2009-02-06 | 580-558-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2009-02-06 | 580-558-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | LAWTON | OK |
| 2008-10-21 | 580-379-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | ALTUS | OK |
| 2008-10-21 | 580-379-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | ALTUS | OK |
| 2008-08-15 | 580-616-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2008-08-15 | 580-616-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2008-08-15 | 580-616-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2008-08-15 | 580-616-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | ENID | OK |
| 2007-02-15 | 580-559-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | ADA | OK |
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.