NumberResearchThousands-blocks in 857-386
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 857-386 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-04-18 | 857-386-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | CHELSEA | MA |
| 2018-10-01 | 857-386-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | CHELSEA | MA |
| 2016-08-05 | 857-386-2XXX | 2000–2999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | CHELSEA | MA |
| 2016-08-05 | 857-386-3XXX | 3000–3999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | CHELSEA | MA |
| 2020-05-26 | 857-386-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | CHELSEA | MA |
| 2017-03-15 | 857-386-5XXX | 5000–5999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CHELSEA | MA |
| 2019-01-24 | 857-386-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MA | 892D | CHELSEA | MA |
| 2019-01-24 | 857-386-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MA | 892D | CHELSEA | MA |
| 2018-10-09 | 857-386-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | CHELSEA | MA |
| 2017-06-08 | 857-386-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | CHELSEA | 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.