NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 401
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-06-17 | 401-571-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | PROVIDENCE | RI |
| 2026-06-17 | 401-571-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | PROVIDENCE | RI |
| 2026-06-17 | 401-571-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | PROVIDENCE | RI |
| 2025-12-11 | 401-534-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | WOONSOCKET | RI |
| 2025-12-11 | 401-534-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | WOONSOCKET | RI |
| 2025-12-11 | 401-540-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | CUMBLND HL | RI |
| 2025-12-11 | 401-540-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | CUMBLND HL | RI |
| 2025-12-11 | 401-546-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | PAWTUCKET | RI |
| 2025-12-11 | 401-546-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | PAWTUCKET | RI |
| 2025-12-11 | 401-843-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | NEWPORT | RI |
| 2025-12-11 | 401-843-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | NEWPORT | RI |
| 2021-12-15 | 401-395-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | CENTREDALE | RI |
| 2021-12-15 | 401-395-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | CENTREDALE | RI |
| 2020-05-06 | 401-240-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2020-05-06 | 401-240-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2020-05-06 | 401-610-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2020-05-06 | 401-610-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2020-05-06 | 401-678-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | PASCOAG | RI |
| 2020-05-06 | 401-678-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | PASCOAG | RI |
| 2020-05-04 | 401-472-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | PORTSMOUTH | RI |
| 2020-05-04 | 401-472-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | PORTSMOUTH | RI |
| 2018-12-19 | 401-799-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | PROVIDENCE | RI |
| 2016-04-25 | 401-342-0XXX | 0000–0999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2016-04-25 | 401-342-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2016-04-25 | 401-342-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2016-04-25 | 401-342-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2016-04-25 | 401-342-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2016-04-25 | 401-342-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | BRISTOL | RI |
| 2016-04-25 | 401-385-1XXX | 1000–1999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2016-04-25 | 401-385-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2016-04-25 | 401-385-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2016-04-25 | 401-385-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2016-04-25 | 401-385-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
| 2016-04-25 | 401-385-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | COVENTRY | RI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.