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 317
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-03-18 | 317-343-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CARMEL | IN |
| 2013-11-06 | 317-279-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PLAINFIELD | IN |
| 2013-11-06 | 317-401-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | SHELBYVL | IN |
| 2013-11-06 | 317-483-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MOORESVL | IN |
| 2013-11-06 | 317-597-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | OAKLANDON | IN |
| 2013-11-06 | 317-620-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | NEWPALSTIN | IN |
| 2013-11-06 | 317-647-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SHERIDAN | IN |
| 2013-11-06 | 317-857-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WESTNEWTON | IN |
| 2013-11-06 | 317-900-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | NOBLESVL | IN |
| 2013-11-06 | 317-973-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ZIONSVILLE | IN |
| 2013-11-04 | 317-215-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | GREENWOOD | IN |
| 2013-11-04 | 317-350-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BROWNSBURG | IN |
| 2013-11-04 | 317-434-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | CUMBERLAND | IN |
| 2013-11-04 | 317-449-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ACTON | IN |
| 2013-11-04 | 317-563-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | DANVILLE | IN |
| 2013-11-04 | 317-649-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | GREENFIELD | IN |
| 2013-11-04 | 317-712-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | FISHERS | IN |
| 2013-11-04 | 317-720-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | FAIRLAND | IN |
| 2013-11-04 | 317-814-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | CARMEL | IN |
| 2013-11-04 | 317-936-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | CHARLOTSVL | IN |
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.