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
2020-05-29 857-837-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2020-05-29 857-837-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2020-05-28 857-353-1XXX 1000–1999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-26 857-357-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D CAMBRIDGE MA
2020-05-26 857-357-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D CAMBRIDGE MA
2020-05-26 857-386-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D CHELSEA MA
2020-05-26 857-423-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D BROOKLINE MA
2020-05-26 857-423-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D BROOKLINE MA
2020-05-26 857-520-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D HYDE PARK MA
2020-05-26 857-728-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D JAMAICA PL MA
2020-05-20 857-326-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-326-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-335-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-335-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-353-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-18 857-567-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2020-05-18 857-567-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2020-05-18 857-567-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2020-05-18 857-567-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2020-05-14 857-380-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D EASTBOSTON MA
2020-05-14 857-380-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D EASTBOSTON MA
2020-05-14 857-858-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D NEWTON MA
2020-05-14 857-858-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D NEWTON MA
2020-05-14 857-858-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D NEWTON MA
2020-05-14 857-877-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2020-05-14 857-877-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2020-05-14 857-877-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2020-05-13 857-341-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D BELMONT MA
2020-05-13 857-341-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D BELMONT MA
2020-05-12 857-298-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H CAMBRIDGE MA
2020-05-12 857-298-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H CAMBRIDGE MA
2020-05-12 857-298-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H CAMBRIDGE MA
2020-05-12 857-298-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H CAMBRIDGE MA
2020-05-11 857-465-8XXX 8000–8999Assigned FRACTEL, LLC 965H BOSTON MA
2020-05-08 857-358-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D QUINCY MA
2020-05-08 857-358-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D QUINCY MA
2020-05-08 857-358-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D QUINCY MA
2020-05-08 857-437-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D ROXBURY MA
2020-05-08 857-437-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D ROXBURY MA
2020-05-04 857-335-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-05-04 857-335-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-05-04 857-335-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-04-28 857-355-9XXX 9000–9999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F EVERETT MA
2020-04-23 857-355-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D EVERETT MA
2020-04-23 857-355-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D EVERETT MA
2020-04-16 857-328-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-04-16 857-328-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-04-16 857-328-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-04-14 857-358-5XXX 5000–5999Assigned HD CARRIER LLC 321J QUINCY MA
2020-04-06 857-524-6XXX 6000–6999Assigned TC SYSTEMS, INC. 7135 SO 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.