NumberResearchRecent thousands-block assignments
2 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 857
New assignments by month
Sep 2026
Aug 2026
Jul 2026
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Apr 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-05-27 | 857-342-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | HYDE PARK | MA |
| 2010-05-25 | 857-239-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | BOSTON | MA |
| 2010-04-27 | 857-230-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | ROXBURY | MA |
| 2010-04-21 | 857-243-8XXX | 8000–8999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BOSTON | MA |
| 2010-04-21 | 857-243-9XXX | 9000–9999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BOSTON | MA |
| 2010-04-21 | 857-547-9XXX | 9000–9999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | JAMAICA PL | MA |
| 2010-03-23 | 857-203-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | JAMAICA PL | MA |
| 2010-03-23 | 857-342-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | HYDE PARK | MA |
| 2010-03-23 | 857-574-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | EASTBOSTON | MA |
| 2010-03-12 | 857-239-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2010-03-04 | 857-225-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BROOKLINE | MA |
| 2010-02-23 | 857-215-0XXX | 0000–0999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-1XXX | 1000–1999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-2XXX | 2000–2999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-3XXX | 3000–3999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-4XXX | 4000–4999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-5XXX | 5000–5999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-6XXX | 6000–6999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-7XXX | 7000–7999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-8XXX | 8000–8999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-23 | 857-215-9XXX | 9000–9999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2010-02-16 | 857-293-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | EASTBOSTON | MA |
| 2010-02-03 | 857-246-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | BOSTON | MA |
| 2010-01-29 | 857-246-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOSTON | MA |
| 2010-01-21 | 857-246-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2010-01-19 | 857-342-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | HYDE PARK | MA |
| 2010-01-07 | 857-939-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | QUINCY | MA |
| 2009-12-17 | 857-224-0XXX | 0000–0999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-1XXX | 1000–1999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-2XXX | 2000–2999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-3XXX | 3000–3999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-4XXX | 4000–4999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-5XXX | 5000–5999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-6XXX | 6000–6999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-7XXX | 7000–7999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-8XXX | 8000–8999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-12-17 | 857-224-9XXX | 9000–9999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BOSTON | MA |
| 2009-11-24 | 857-243-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2009-11-23 | 857-217-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | DORCHESTER | MA |
| 2009-11-23 | 857-227-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | SOMERVILLE | MA |
| 2009-11-23 | 857-228-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MA | 892D | WATERTOWN | MA |
| 2009-11-23 | 857-229-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MA | 892D | NEWTON | MA |
| 2009-11-23 | 857-364-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | BROOKLINE | MA |
| 2009-11-23 | 857-399-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | ROXBURY | MA |
| 2009-11-23 | 857-403-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MA | 892D | QUINCY | MA |
| 2009-11-23 | 857-496-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MA | 892D | SO BOSTON | MA |
| 2009-11-23 | 857-559-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | BRIGHTON | MA |
| 2009-11-23 | 857-574-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | EASTBOSTON | MA |
| 2009-11-23 | 857-588-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | CHARLESTN | MA |
| 2009-11-23 | 857-598-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | 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.