NumberResearchThousands-blocks in 501-457
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 501-457 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 501-457-0XXX | 0000–0999 | Reserved | WINDSTREAM COMMUNICATIONS, INC. - AR | 7656 | JACKSONVL | AR |
| 2018-10-23 | 501-457-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JACKSONVL | AR |
| 2015-10-28 | 501-457-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | JACKSONVL | AR |
| 2019-11-11 | 501-457-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JACKSONVL | AR |
| 2020-05-15 | 501-457-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | JACKSONVL | AR |
| — | 501-457-5XXX | 5000–5999 | Reserved | WINDSTREAM COMMUNICATIONS, INC. - AR | 7656 | JACKSONVL | AR |
| 2021-03-19 | 501-457-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AR | 348F | JACKSONVL | AR |
| 2007-02-06 | 501-457-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | JACKSONVL | AR |
| — | 501-457-8XXX | 8000–8999 | Reserved | WINDSTREAM COMMUNICATIONS, INC. - AR | 7656 | JACKSONVL | AR |
| 2019-03-14 | 501-457-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AR | 348F | JACKSONVL | 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.