NumberResearchRecent thousands-block assignments
26 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, last 30 days — NPA 636
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-01-31 | 636-443-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | MO |
| 2003-01-31 | 636-443-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | ST CHARLES | MO |
| 2003-01-16 | 636-299-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | CHESTERFLD | MO |
| 2002-12-27 | 636-299-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | CHESTERFLD | MO |
| 2002-12-26 | 636-614-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | OFALLON | MO |
| 2002-12-23 | 636-442-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | HARVESTER | MO |
| 2002-11-25 | 636-634-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | MO |
| 2002-11-25 | 636-634-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | MO |
| 2002-11-25 | 636-634-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | MO |
| 2002-11-08 | 636-628-4XXX | 4000–4999 | Assigned | AT&T - LOCAL | 7421 | MANCHESTER | MO |
| 2002-10-28 | 636-405-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MO | 093F | POND | MO |
| 2002-10-28 | 636-442-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MO | 093F | HARVESTER | MO |
| 2002-10-28 | 636-475-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MO | 093F | HERCUMPVLY | MO |
| 2002-10-28 | 636-671-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MO | 093F | HIGH RIDGE | MO |
| 2002-10-28 | 636-938-0XXX | 0000–0999 | Assigned | ONVOY, LLC - MO | 093F | EUREKA | MO |
| 2002-10-28 | 636-942-0XXX | 0000–0999 | Assigned | ONVOY, LLC - MO | 093F | ANTONIA | 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.