NumberResearchThousands-blocks in 857-349
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 857-349 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 857 blocks
Most active assignees, all time — NPA 857
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-09-21 | 857-349-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | WINTHROP | MA |
| 2019-02-04 | 857-349-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | WINTHROP | MA |
| 2021-03-23 | 857-349-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MA | 892D | WINTHROP | MA |
| — | 857-349-3XXX | 3000–3999 | Available | WINTHROP | MA | ||
| 2021-02-05 | 857-349-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | WINTHROP | MA |
| 2021-02-05 | 857-349-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MA | 892D | WINTHROP | MA |
| 2019-04-10 | 857-349-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | WINTHROP | MA |
| 2021-03-16 | 857-349-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WINTHROP | MA |
| 2019-04-17 | 857-349-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | WINTHROP | MA |
| 2020-06-19 | 857-349-9XXX | 9000–9999 | Assigned | ONVOY, LLC - MA | 892D | 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.