NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 857
BANDWIDTH.COM CLEC, LLC - MA 1
AHOI LLC 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
2019-04-11 857-344-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D QUINCY MA
2019-04-11 857-344-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D QUINCY MA
2019-04-10 857-349-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WINTHROP MA
2019-03-27 857-856-9XXX 9000–9999Assigned IP HORIZON LLC 515J CAMBRIDGE MA
2019-02-28 857-760-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WATERTOWN MA
2019-02-08 857-341-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2019-02-08 857-341-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2019-02-05 857-299-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2019-02-05 857-299-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2019-02-05 857-299-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2019-02-05 857-299-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2019-02-04 857-349-1XXX 1000–1999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F WINTHROP MA
2019-02-04 857-524-8XXX 8000–8999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F SO BOSTON MA
2019-01-25 857-322-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D EASTBOSTON MA
2019-01-25 857-322-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D EASTBOSTON MA
2019-01-25 857-520-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D HYDE PARK MA
2019-01-25 857-663-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2019-01-25 857-663-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2019-01-25 857-703-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D HYDE PARK MA
2019-01-24 857-290-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D NEWTON MA
2019-01-24 857-297-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D NEWTON MA
2019-01-24 857-299-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D BELMONT MA
2019-01-24 857-299-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D BELMONT MA
2019-01-24 857-361-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D BROOKLINE MA
2019-01-24 857-386-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D CHELSEA MA
2019-01-24 857-386-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D CHELSEA MA
2019-01-24 857-410-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2019-01-24 857-410-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2019-01-24 857-419-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D MILTON MA
2019-01-24 857-419-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D MILTON MA
2019-01-24 857-425-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2019-01-24 857-425-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2019-01-24 857-576-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BROOKLINE MA
2019-01-24 857-760-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D WATERTOWN MA
2019-01-24 857-760-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D WATERTOWN MA
2018-12-27 857-354-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-12-27 857-354-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-12-12 857-344-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2018-12-06 857-299-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D BELMONT MA
2018-12-06 857-299-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BELMONT MA
2018-12-05 857-663-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E DORCHESTER MA
2018-11-26 857-354-9XXX 9000–9999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2018-11-20 857-757-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2018-11-20 857-757-9XXX 9000–9999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2018-11-07 857-799-9XXX 9000–9999Assigned HD CARRIER LLC 321J CAMBRIDGE MA
2018-10-31 857-338-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-30 857-338-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J BOSTON MA
2018-10-26 857-520-6XXX 6000–6999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F HYDE PARK MA
2018-10-25 857-348-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-25 857-348-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 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.