NumberResearchRecent thousands-block assignments
2 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-07-14 | 857-991-8XXX | 8000–8999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2004-07-12 | 857-991-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2004-07-12 | 857-991-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2003-12-05 | 857-991-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2003-12-05 | 857-991-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2003-12-05 | 857-991-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2003-11-18 | 857-991-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-11-10 | 857-991-6XXX | 6000–6999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-11-10 | 857-991-7XXX | 7000–7999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-08-22 | 857-598-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MILTON | MA |
| 2003-07-11 | 857-204-8XXX | 8000–8999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-05-05 | 857-204-5XXX | 5000–5999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-05-05 | 857-204-6XXX | 6000–6999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-05-05 | 857-204-7XXX | 7000–7999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-04-14 | 857-204-4XXX | 4000–4999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-01-17 | 857-204-2XXX | 2000–2999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2003-01-17 | 857-204-3XXX | 3000–3999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2002-12-27 | 857-373-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | BELMONT | MA |
| 2002-11-14 | 857-204-0XXX | 0000–0999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2002-11-14 | 857-204-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2002-07-25 | 857-991-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | BOSTON | MA |
| 2002-04-22 | 857-217-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | DORCHESTER | MA |
| 2002-01-17 | 857-524-4XXX | 4000–4999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | SO BOSTON | MA |
| 2002-01-16 | 857-728-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | JAMAICA PL | MA |
| 2001-09-17 | 857-229-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | NEWTON | MA |
| 2001-08-15 | 857-228-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | WATERTOWN | MA |
| 2001-08-15 | 857-559-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | BRIGHTON | MA |
| 2001-08-15 | 857-574-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | EASTBOSTON | MA |
| 2001-08-15 | 857-728-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | JAMAICA PL | MA |
| 2001-08-15 | 857-995-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | SOMERVILLE | MA |
| 2001-08-01 | 857-524-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | SO BOSTON | MA |
| 2001-07-23 | 857-401-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | SO BOSTON | MA |
| 2001-07-02 | 857-364-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | BROOKLINE | MA |
| 2001-05-15 | 857-574-7XXX | 7000–7999 | Assigned | AT&T - LOCAL | 7421 | EASTBOSTON | MA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.