+1 857 numbers: Boston, MA
What the numbering plan and the regulator's allocation table say about numbers starting +1 857: the place, the line types, every block's status and the carriers those blocks were allocated to. Original allocation, not who serves a number today.
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Response
Look up any number to see the full API response, straight from the live service. National formats need the country.
The range at a glance
| Country | United States (US) |
|---|---|
| Calling code | +1 |
| Prefix | 857 |
| Place named by the numbering metadata | Boston, MA |
| Time zones | America/New_York |
| Line types by the numbering plan | fixed_line_or_mobile |
| Example format | +1 857-200-0000 |
Blocks in the regulator's table
Each block is a 6-digit prefix of the national number. A number in an allocated block is assignable; in an unassigned block no carrier can have a subscriber, so the lookup answers unassigned_block for it. Of the allocated blocks, 47.9% belong to a wireless carrier, 20.9% to a virtual-number wholesaler or VoIP provider, and 31.1% to a holder whose name settles neither.
| Allocated | 363 |
|---|---|
| Unassigned | 0 |
| Reserved | 20 |
| Total blocks | 383 |
Who the blocks were allocated to
The holders as the regulator lists them, by number of allocated blocks. Allocation is not service: a ported number keeps its original block, so a holder here may no longer serve a given number.
| holder | kind | blocks | share |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | mobile | 67 | 18.5% |
| OMNIPOINT MIAMI E LICENSE, LLC | mobile | 62 | 17.1% |
| ONVOY, LLC - MA | voip | 42 | 11.6% |
| METROPCS, INC. | mobile | 25 | 6.9% |
| PAETEC ITEL, LLC | unsettled | 19 | 5.2% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | mobile | 18 | 5.0% |
| VERIZON NEW ENGLAND INC. | unsettled | 13 | 3.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | unsettled | 13 | 3.6% |
| LEVEL 3 COMMUNICATIONS, LLC - MA | unsettled | 10 | 2.8% |
| BANDWIDTH.COM CLEC, LLC - MA | voip | 10 | 2.8% |
How to read this page
Everything above comes from two public sources: the numbering metadata that names the place, the zones and the line types of the range, and the regulator's allocation table that lists each block's status and holder. Neither knows who serves a number today, whether a handset is switched on, or who answers it. Spaw reports what the tables say and names the dataset and version behind every answer.
More area codes in United States
nanpa-co-codes 2026-09-05 · checked 2026-09-05
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