NumberResearchThousands-blocks in 857-363
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 857-363 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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 857-363-0XXX | 0000–0999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | EVERETT | MA |
| — | 857-363-1XXX | 1000–1999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | EVERETT | MA |
| 2006-02-23 | 857-363-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | EVERETT | MA |
| 2006-02-23 | 857-363-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | EVERETT | MA |
| 2016-08-10 | 857-363-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | EVERETT | MA |
| 2023-06-28 | 857-363-5XXX | 5000–5999 | Assigned | TELNYX LLC | 073H | EVERETT | MA |
| 2022-04-14 | 857-363-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MA | 892D | EVERETT | MA |
| 2016-02-02 | 857-363-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | EVERETT | MA |
| — | 857-363-8XXX | 8000–8999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | EVERETT | MA |
| 2026-08-17 | 857-363-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | EVERETT | 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.