NumberResearchThousands-blocks in 617-207
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 617-207 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 617 blocks
Most active assignees, all time — NPA 617
New assignments by month
Sep 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 |
|---|---|---|---|---|---|---|---|
| 2015-04-30 | 617-207-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | WINTHROP | MA |
| — | 617-207-1XXX | 1000–1999 | Reserved | COMCAST IP PHONE, LLC | 318J | WINTHROP | MA |
| 2016-01-25 | 617-207-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MA | 892D | WINTHROP | MA |
| 2013-01-23 | 617-207-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | WINTHROP | MA |
| 2009-07-13 | 617-207-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WINTHROP | MA |
| 2005-09-02 | 617-207-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WINTHROP | MA |
| 2010-03-23 | 617-207-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MA | 892D | WINTHROP | MA |
| 2009-06-26 | 617-207-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | WINTHROP | MA |
| 2013-04-08 | 617-207-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | WINTHROP | MA |
| 2006-08-15 | 617-207-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | WINTHROP | 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.