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
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 |
|---|---|---|---|---|---|---|---|
| 2022-11-03 | 636-867-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | JONESBURG | MO |
| 2013-11-04 | 636-209-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | FSSCRSTLCY | MO |
| 2013-11-04 | 636-223-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | IMPERIAL | MO |
| 2013-11-04 | 636-231-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WASHINGTON | MO |
| 2013-11-04 | 636-238-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | MANCHESTER | MO |
| 2013-11-04 | 636-259-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GRAYSUMMIT | MO |
| 2013-11-04 | 636-321-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MAXVILLE | MO |
| 2013-11-04 | 636-322-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | ST CLAIR | MO |
| 2013-11-04 | 636-324-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | POND | MO |
| 2013-11-04 | 636-362-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HARVESTER | MO |
| 2013-11-04 | 636-385-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | OFALLON | MO |
| 2013-11-04 | 636-393-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | PACIFIC | MO |
| 2013-11-04 | 636-400-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PORTAGSIUX | MO |
| 2013-11-04 | 636-429-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | EUREKA | MO |
| 2013-11-04 | 636-435-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | VALLEYPARK | MO |
| 2013-11-04 | 636-475-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | HERCUMPVLY | MO |
| 2013-11-04 | 636-495-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HIGH RIDGE | MO |
| 2013-11-04 | 636-649-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | UNION | MO |
| 2013-11-04 | 636-651-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | FENTON | MO |
| 2013-11-04 | 636-723-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ST CHARLES | MO |
| 2013-11-04 | 636-789-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | HILLSBORO | MO |
| 2013-11-04 | 636-944-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WARE | MO |
| 2013-11-01 | 636-323-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ANTONIA | MO |
| 2013-11-01 | 636-565-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | DE SOTO | MO |
| 2013-11-01 | 636-730-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | CHESTERFLD | MO |
| 2013-11-01 | 636-748-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | CEDAR HILL | 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.