NumberResearchThousands-blocks in 501-365
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 501-365 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 501 blocks
Most active assignees, all time — NPA 501
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 501-365-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | HEBER SPG | AR |
| 2008-11-21 | 501-365-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - AR | 196F | HEBER SPG | AR |
| 2008-01-22 | 501-365-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AR | 5179 | HEBER SPG | AR |
| 2006-12-21 | 501-365-3XXX | 3000–3999 | Assigned | TCA COMMUNICATIONS, LLC DBA SUDDENLINK COMM - AR | 048G | HEBER SPG | AR |
| 2026-06-03 | 501-365-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | HEBER SPG | AR |
| 2026-06-03 | 501-365-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | HEBER SPG | AR |
| 2008-09-05 | 501-365-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HEBER SPG | AR |
| 2011-03-30 | 501-365-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HEBER SPG | AR |
| 2020-01-06 | 501-365-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AR | 348F | HEBER SPG | AR |
| 2020-01-06 | 501-365-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AR | 348F | HEBER SPG | AR |
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.