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
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-04-18 | 857-587-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | DORCHESTER | MA |
| 2016-04-18 | 857-587-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | DORCHESTER | MA |
| 2016-04-18 | 857-587-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | DORCHESTER | MA |
| 2016-03-25 | 857-276-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-276-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-972-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-25 | 857-972-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2016-03-18 | 857-227-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | SOMERVILLE | MA |
| 2016-03-18 | 857-227-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | SOMERVILLE | MA |
| 2016-03-18 | 857-227-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | SOMERVILLE | MA |
| 2016-03-18 | 857-256-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-280-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-280-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | BRIGHTON | MA |
| 2016-03-18 | 857-314-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | MILTON | MA |
| 2016-03-18 | 857-314-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | MILTON | MA |
| 2016-03-18 | 857-336-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | WINTHROP | MA |
| 2016-03-18 | 857-336-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | WINTHROP | MA |
| 2016-03-18 | 857-336-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | WINTHROP | MA |
| 2016-03-18 | 857-336-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | WINTHROP | MA |
| 2016-03-18 | 857-402-0XXX | 0000–0999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-402-1XXX | 1000–1999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-402-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-402-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-402-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-402-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-402-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | EASTBOSTON | MA |
| 2016-03-18 | 857-477-0XXX | 0000–0999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-1XXX | 1000–1999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-477-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | JAMAICA PL | MA |
| 2016-03-18 | 857-577-0XXX | 0000–0999 | Assigned | HD CARRIER LLC | 321J | CHARLESTN | MA |
| 2016-03-18 | 857-577-1XXX | 1000–1999 | Assigned | HD CARRIER LLC | 321J | CHARLESTN | MA |
| 2016-03-18 | 857-577-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | CHARLESTN | 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.