NumberResearchThousands-blocks in 508-576
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 508-576 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 508 blocks
Most active assignees, all time — NPA 508
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-12-08 | 508-576-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | NO ATTLEBO | MA |
| 2015-02-24 | 508-576-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NO ATTLEBO | MA |
| 2015-12-03 | 508-576-2XXX | 2000–2999 | Assigned | BARR TELL USA, INC. - MA | 732H | NO ATTLEBO | MA |
| 2024-05-14 | 508-576-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | NO ATTLEBO | MA |
| 2012-10-18 | 508-576-4XXX | 4000–4999 | Assigned | TC SYSTEMS, INC. | 7135 | NO ATTLEBO | MA |
| 2016-02-29 | 508-576-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MA | 892D | NO ATTLEBO | MA |
| — | 508-576-6XXX | 6000–6999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NO ATTLEBO | MA |
| — | 508-576-7XXX | 7000–7999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NO ATTLEBO | MA |
| 2014-12-31 | 508-576-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | NO ATTLEBO | MA |
| 2025-12-02 | 508-576-9XXX | 9000–9999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | NO ATTLEBO | MA |
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.