NumberResearch Membership · Data 09/22/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/22/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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 617
HD CARRIER LLC 31
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2026-08-13 617-597-3XXX 3000–3999Assigned HD CARRIER LLC 321J NEWTON MA
2026-06-17 617-376-9XXX 9000–9999Assigned HD CARRIER LLC 321J QUINCY MA
2026-04-09 617-717-2XXX 2000–2999Assigned HD CARRIER LLC 321J BOSTON MA
2026-02-12 617-671-2XXX 2000–2999Assigned HD CARRIER LLC 321J BOSTON MA
2026-02-12 617-848-7XXX 7000–7999Assigned HD CARRIER LLC 321J BOSTON MA
2026-02-12 617-885-5XXX 5000–5999Assigned HD CARRIER LLC 321J BOSTON MA
2025-10-29 617-857-3XXX 3000–3999Assigned HD CARRIER LLC 321J BROOKLINE MA
2025-10-29 617-857-4XXX 4000–4999Assigned HD CARRIER LLC 321J BROOKLINE MA
2025-10-29 617-857-5XXX 5000–5999Assigned HD CARRIER LLC 321J BROOKLINE MA
2016-08-10 617-890-2XXX 2000–2999Assigned HD CARRIER LLC 321J QUINCY MA
2016-08-10 617-890-3XXX 3000–3999Assigned HD CARRIER LLC 321J QUINCY MA
2016-08-10 617-890-8XXX 8000–8999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-691-8XXX 8000–8999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-729-1XXX 1000–1999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-769-8XXX 8000–8999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-793-8XXX 8000–8999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-804-8XXX 8000–8999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-804-9XXX 9000–9999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-829-1XXX 1000–1999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-829-5XXX 5000–5999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-829-6XXX 6000–6999Assigned HD CARRIER LLC 321J QUINCY MA
2016-04-18 617-829-7XXX 7000–7999Assigned HD CARRIER LLC 321J QUINCY MA
2016-03-18 617-544-5XXX 5000–5999Assigned HD CARRIER LLC 321J EVERETT MA
2016-03-18 617-741-2XXX 2000–2999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-03-18 617-941-8XXX 8000–8999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-03-18 617-944-3XXX 3000–3999Assigned HD CARRIER LLC 321J EVERETT MA
2016-03-18 617-944-7XXX 7000–7999Assigned HD CARRIER LLC 321J EVERETT MA
2016-03-18 617-944-8XXX 8000–8999Assigned HD CARRIER LLC 321J EVERETT MA
2016-03-18 617-996-3XXX 3000–3999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-03-18 617-996-4XXX 4000–4999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2015-05-20 617-657-7XXX 7000–7999Assigned HD CARRIER LLC 321J QUINCY MA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.