NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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, all time — NPA 857
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-12-03 | 857-337-3XXX | 3000–3999 | Assigned | BARR TELL USA, INC. - MA | 732H | BROOKLINE | MA |
| 2015-12-03 | 857-520-5XXX | 5000–5999 | Assigned | BARR TELL USA, INC. - MA | 732H | HYDE PARK | MA |
| 2015-12-02 | 857-226-6XXX | 6000–6999 | Assigned | BARR TELL USA, INC. - MA | 732H | NEWTON | MA |
| 2015-12-02 | 857-227-7XXX | 7000–7999 | Assigned | BARR TELL USA, INC. - MA | 732H | SOMERVILLE | MA |
| 2015-12-02 | 857-314-3XXX | 3000–3999 | Assigned | BARR TELL USA, INC. - MA | 732H | MILTON | MA |
| 2015-12-02 | 857-316-1XXX | 1000–1999 | Assigned | BARR TELL USA, INC. - MA | 732H | BRIGHTON | MA |
| 2015-12-02 | 857-323-4XXX | 4000–4999 | Assigned | BARR TELL USA, INC. - MA | 732H | CHELSEA | MA |
| 2015-12-02 | 857-402-2XXX | 2000–2999 | Assigned | BARR TELL USA, INC. - MA | 732H | EASTBOSTON | MA |
| 2015-12-02 | 857-407-7XXX | 7000–7999 | Assigned | BARR TELL USA, INC. - MA | 732H | ROXBURY | MA |
| 2015-12-02 | 857-499-9XXX | 9000–9999 | Assigned | BARR TELL USA, INC. - MA | 732H | QUINCY | MA |
| 2015-12-02 | 857-757-2XXX | 2000–2999 | Assigned | BARR TELL USA, INC. - MA | 732H | CAMBRIDGE | MA |
| 2015-11-24 | 857-880-8XXX | 8000–8999 | Assigned | BARR TELL USA, INC. - MA | 732H | BOSTON | MA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.