NumberResearchThousands-blocks in 501-261
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 501-261 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-04-03 | 501-261-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AR | 196F | SPRINGLAKE | AR |
| — | 501-261-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | SPRINGLAKE | AR |
| 2018-06-07 | 501-261-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - AR | 196F | SPRINGLAKE | AR |
| 2017-01-17 | 501-261-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SPRINGLAKE | AR |
| 2018-12-11 | 501-261-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | SPRINGLAKE | AR |
| 2011-03-21 | 501-261-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SPRINGLAKE | AR |
| 2018-12-17 | 501-261-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AR | 348F | SPRINGLAKE | AR |
| — | 501-261-7XXX | 7000–7999 | Reserved | SOUTHWESTERN BELL | 9533 | SPRINGLAKE | AR |
| 2005-11-07 | 501-261-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | SPRINGLAKE | AR |
| 2011-06-07 | 501-261-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - AR | 196F | SPRINGLAKE | AR |
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.