NumberResearchThousands-blocks in 617-433
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 617-433 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-12-21 | 617-433-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | MILTON | MA |
| 2006-08-31 | 617-433-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILTON | MA |
| — | 617-433-2XXX | 2000–2999 | Reserved | PAETEC ITEL, LLC | 829J | MILTON | MA |
| — | 617-433-3XXX | 3000–3999 | Reserved | TC SYSTEMS, INC. | 7135 | MILTON | MA |
| 2004-09-15 | 617-433-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | MILTON | MA |
| 2010-03-23 | 617-433-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MA | 892D | MILTON | MA |
| 2009-08-11 | 617-433-6XXX | 6000–6999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | MILTON | MA |
| 2010-05-27 | 617-433-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | MILTON | MA |
| 2010-10-18 | 617-433-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | MILTON | MA |
| 2012-11-26 | 617-433-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | MILTON | 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.