NumberResearchThousands-blocks in 508-381
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 508-381 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 508-381-0XXX | 0000–0999 | Reserved | COMCAST IP PHONE, LLC | 318J | MILFORD | MA |
| — | 508-381-1XXX | 1000–1999 | Reserved | COMCAST IP PHONE, LLC | 318J | MILFORD | MA |
| 2011-01-17 | 508-381-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | MILFORD | MA |
| — | 508-381-3XXX | 3000–3999 | Reserved | COMCAST IP PHONE, LLC | 318J | MILFORD | MA |
| — | 508-381-4XXX | 4000–4999 | Available | MILFORD | MA | ||
| 2006-01-05 | 508-381-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | MILFORD | MA |
| — | 508-381-6XXX | 6000–6999 | Reserved | PAETEC ITEL, LLC | 829J | MILFORD | MA |
| 2009-03-06 | 508-381-7XXX | 7000–7999 | Assigned | FREEDOM RING COMMUNICATIONS, LLC | 8468 | MILFORD | MA |
| 2008-10-30 | 508-381-8XXX | 8000–8999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | MILFORD | MA |
| 2010-01-13 | 508-381-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | MILFORD | MA |
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.