NumberResearchRecent thousands-block assignments
0 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, all time — NPA 857
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-01-12 | 857-574-6XXX | 6000–6999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | EASTBOSTON | 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 |
| 2009-11-03 | 857-216-0XXX | 0000–0999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | NEWTON | MA |
| 2009-11-03 | 857-216-1XXX | 1000–1999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | NEWTON | MA |
| 2008-08-29 | 857-574-2XXX | 2000–2999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | EASTBOSTON | MA |
| 2008-06-19 | 857-288-0XXX | 0000–0999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BOSTON | MA |
| 2006-11-09 | 857-245-0XXX | 0000–0999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BROOKLINE | MA |
| 2006-11-09 | 857-245-1XXX | 1000–1999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BROOKLINE | MA |
| 2006-11-09 | 857-245-2XXX | 2000–2999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BROOKLINE | MA |
| 2006-11-09 | 857-245-3XXX | 3000–3999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BROOKLINE | MA |
| 2006-11-09 | 857-245-4XXX | 4000–4999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | BROOKLINE | 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.