NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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
2011-02-14 617-863-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D SOMERVILLE MA
2011-02-10 617-752-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E SO BOSTON MA
2011-02-02 617-418-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 EASTBOSTON MA
2011-01-24 617-286-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CHARLESTN MA
2011-01-10 617-934-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 QUINCY MA
2011-01-05 617-945-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2010-12-06 617-866-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2010-12-03 617-249-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E QUINCY MA
2010-12-03 617-286-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CHARLESTN MA
2010-12-03 617-334-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E SO BOSTON MA
2010-12-03 617-410-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E EVERETT MA
2010-12-03 617-466-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CHELSEA MA
2010-12-03 617-539-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E WINTHROP MA
2010-12-03 617-870-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BRIGHTON MA
2010-11-19 617-231-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J WATERTOWN MA
2010-11-15 617-702-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SOMERVILLE MA
2010-11-02 617-945-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2010-10-20 617-751-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J BROOKLINE MA
2010-10-18 617-333-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E HYDE PARK MA
2010-10-18 617-340-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E NEWTON MA
2010-10-18 617-396-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BROOKLINE MA
2010-10-18 617-433-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E MILTON MA
2010-10-18 617-684-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E SOMERVILLE MA
2010-10-18 617-819-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CHELSEA MA
2010-10-18 617-858-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E ROXBURY MA
2010-10-18 617-939-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BOSTON MA
2010-10-18 617-971-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E JAMAICA PL MA
2010-10-14 617-649-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MA 316E CAMBRIDGE MA
2010-10-14 617-649-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MA 316E CAMBRIDGE MA
2010-10-14 617-858-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MA 316E ROXBURY MA
2010-10-13 617-583-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2010-10-13 617-583-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2010-10-13 617-583-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2010-10-13 617-682-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2010-10-13 617-898-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
2010-10-13 617-898-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
2010-10-12 617-706-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D QUINCY MA
2010-10-12 617-706-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D QUINCY MA
2010-10-12 617-706-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-12 617-706-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D QUINCY MA
2010-10-12 617-706-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-12 617-729-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-12 617-729-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D QUINCY MA
2010-10-12 617-729-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D QUINCY MA
2010-10-12 617-729-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-12 617-793-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-12 617-793-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D QUINCY MA
2010-10-12 617-793-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-12 617-793-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
2010-10-08 617-939-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON 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.