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 917
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-09-24 | 917-352-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN09 | NY |
| 2024-07-11 | 917-210-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN01 | NY |
| 2013-12-30 | 917-819-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN03 | NY |
| 2013-12-03 | 917-963-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN09 | NY |
| 2013-07-30 | 917-724-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN15 | NY |
| 2013-03-18 | 917-722-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN14 | NY |
| 2013-03-18 | 917-732-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN09 | NY |
| 2013-03-18 | 917-795-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN04 | NY |
| 2013-03-01 | 917-728-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN01 | NY |
| 2012-05-08 | 917-870-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN03 | NY |
| 2012-03-16 | 917-480-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN12 | NY |
| 2012-03-12 | 917-391-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN08 | NY |
| 2012-03-05 | 917-702-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN07 | NY |
| 2012-03-05 | 917-795-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN04 | NY |
| 2011-02-11 | 917-341-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN09 | NY |
| 2009-03-02 | 917-284-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN01 | NY |
| 2008-03-05 | 917-675-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN01 | NY |
| 2007-08-31 | 917-628-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN01 | NY |
| 2004-10-01 | 917-475-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | NWYRCYZN01 | NY |
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.