NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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 636
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-04-18 | 636-362-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2010-12-09 | 636-300-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2010-06-15 | 636-392-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | WASHINGTON | MO |
| 2009-02-26 | 636-321-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | MAXVILLE | MO |
| 2008-10-14 | 636-496-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | FENTON | MO |
| 2008-10-14 | 636-496-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | FENTON | MO |
| 2008-10-14 | 636-496-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | FENTON | MO |
| 2008-10-14 | 636-496-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | FENTON | MO |
| 2008-04-18 | 636-686-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | MANCHESTER | MO |
| 2007-11-23 | 636-717-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | FENTON | MO |
| 2007-07-11 | 636-461-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | IMPERIAL | MO |
| 2007-05-25 | 636-524-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | FSSCRSTLCY | MO |
| 2006-03-30 | 636-744-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | UNION | MO |
| 2006-01-11 | 636-322-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | ST CLAIR | MO |
| 2006-01-11 | 636-432-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | WASHINGTON | MO |
| 2005-06-13 | 636-321-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | MAXVILLE | MO |
| 2005-05-25 | 636-344-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2005-05-25 | 636-344-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2005-05-25 | 636-344-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2005-05-25 | 636-344-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2005-05-25 | 636-344-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2005-05-13 | 636-422-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | POND | MO |
| 2003-04-14 | 636-261-0XXX | 0000–0999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-5XXX | 5000–5999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-6XXX | 6000–6999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-7XXX | 7000–7999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-8XXX | 8000–8999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
| 2003-04-14 | 636-261-9XXX | 9000–9999 | Assigned | SOUTHWESTERN BELL | 9533 | HARVESTER | MO |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.