NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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, last 30 days — NPA 617
BANDWIDTH.COM CLEC, LLC - MA 1
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
2016-12-20 617-377-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2016-12-20 617-377-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2016-12-08 617-377-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BOSTON MA
2016-11-18 617-665-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CAMBRIDGE MA
2016-10-14 617-795-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTON MA
2016-10-13 617-345-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2016-10-12 617-618-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-10-12 617-658-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-10-12 617-916-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-09-15 617-934-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D QUINCY 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
2016-06-21 617-544-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E EVERETT MA
2016-06-17 617-837-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E QUINCY MA
2016-06-13 617-618-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E NEWTON MA
2016-06-01 617-334-0XXX 0000–0999Assigned IP HORIZON LLC 515J SO BOSTON MA
2016-06-01 617-612-0XXX 0000–0999Assigned IP HORIZON LLC 515J WATERTOWN MA
2016-06-01 617-932-0XXX 0000–0999Assigned IP HORIZON LLC 515J BELMONT MA
2016-05-27 617-370-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHELSEA MA
2016-04-21 617-917-8XXX 8000–8999Assigned RCN TELECOM SERVICES, INC. - MA 7619 EVERETT 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
2016-02-18 617-410-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D EVERETT MA
2016-02-03 617-539-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D WINTHROP MA
2016-02-03 617-539-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D WINTHROP MA
2016-01-28 617-744-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D WATERTOWN MA
2016-01-28 617-744-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D WATERTOWN MA
2016-01-26 617-315-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D SO BOSTON MA
2016-01-26 617-315-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D SO BOSTON MA
2016-01-26 617-764-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D SOMERVILLE MA
2016-01-26 617-855-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D BELMONT MA
2016-01-26 617-855-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D BELMONT MA
2016-01-26 617-863-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D SOMERVILLE 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.