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
2016-03-18 857-577-3XXX 3000–3999Assigned HD CARRIER LLC 321J CHARLESTN MA
2016-03-18 857-577-4XXX 4000–4999Assigned HD CARRIER LLC 321J CHARLESTN MA
2016-03-18 857-577-5XXX 5000–5999Assigned HD CARRIER LLC 321J CHARLESTN MA
2016-03-18 857-577-6XXX 6000–6999Assigned HD CARRIER LLC 321J CHARLESTN MA
2016-03-18 857-577-9XXX 9000–9999Assigned HD CARRIER LLC 321J CHARLESTN MA
2016-03-18 857-880-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BOSTON MA
2016-03-18 857-880-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J BOSTON MA
2016-03-18 857-997-5XXX 5000–5999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-03-18 857-997-6XXX 6000–6999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-03-18 857-997-7XXX 7000–7999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-03-02 857-336-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D WINTHROP MA
2016-03-02 857-336-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D WINTHROP MA
2016-03-02 857-880-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2016-03-02 857-995-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D SOMERVILLE MA
2016-03-02 857-995-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D SOMERVILLE MA
2016-02-29 857-280-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2016-02-29 857-280-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2016-02-26 857-227-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SOMERVILLE MA
2016-02-26 857-227-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J SOMERVILLE MA
2016-02-26 857-227-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SOMERVILLE MA
2016-02-26 857-504-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2016-02-24 857-314-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D MILTON MA
2016-02-24 857-314-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D MILTON MA
2016-02-24 857-316-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2016-02-22 857-626-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D BELMONT MA
2016-02-12 857-274-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-274-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-274-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-274-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-274-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-408-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-408-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-02-12 857-577-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-02-12 857-577-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-02-11 857-477-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D JAMAICA PL MA
2016-02-11 857-477-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D JAMAICA PL MA
2016-02-10 857-587-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2016-02-10 857-587-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D DORCHESTER MA
2016-02-09 857-407-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D ROXBURY MA
2016-02-09 857-407-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D ROXBURY MA
2016-02-09 857-412-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D CAMBRIDGE MA
2016-02-09 857-412-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D CAMBRIDGE MA
2016-02-08 857-226-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D NEWTON MA
2016-02-08 857-226-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D NEWTON MA
2016-02-03 857-337-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BROOKLINE MA
2016-02-03 857-337-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BROOKLINE MA
2016-02-03 857-520-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D HYDE PARK MA
2016-02-03 857-520-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D HYDE PARK MA
2016-02-02 857-314-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D MILTON MA
2016-02-02 857-314-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D MILTON 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.