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
2016-10-14 857-361-6XXX 6000–6999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2016-10-14 857-361-9XXX 9000–9999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2016-10-12 857-279-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-10-12 857-279-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-10-12 857-279-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-10-12 857-279-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2016-10-10 857-760-3XXX 3000–3999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2016-09-23 857-385-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DORCHESTER MA
2016-09-23 857-385-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DORCHESTER MA
2016-09-22 857-409-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-409-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-505-5XXX 5000–5999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-507-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-22 857-507-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-19 857-320-5XXX 5000–5999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2016-09-19 857-763-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-19 857-772-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-19 857-772-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-19 857-880-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-19 857-880-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-09-16 857-410-8XXX 8000–8999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F CHARLESTN MA
2016-09-14 857-361-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D BROOKLINE MA
2016-09-14 857-773-9XXX 9000–9999Assigned METROPCS, INC. 5562 JAMAICA PL MA
2016-09-07 857-425-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIGHTON MA
2016-08-17 857-772-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BOSTON MA
2016-08-16 857-316-6XXX 6000–6999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BRIGHTON MA
2016-08-16 857-361-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2016-08-16 857-760-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 WATERTOWN MA
2016-08-15 857-410-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CHARLESTN MA
2016-08-15 857-410-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CHARLESTN MA
2016-08-10 857-252-1XXX 1000–1999Assigned HD CARRIER LLC 321J QUINCY MA
2016-08-10 857-279-5XXX 5000–5999Assigned HD CARRIER LLC 321J NEWTON MA
2016-08-10 857-279-6XXX 6000–6999Assigned HD CARRIER LLC 321J NEWTON MA
2016-08-10 857-279-9XXX 9000–9999Assigned HD CARRIER LLC 321J NEWTON MA
2016-08-10 857-325-8XXX 8000–8999Assigned HD CARRIER LLC 321J NEWTON MA
2016-08-10 857-325-9XXX 9000–9999Assigned HD CARRIER LLC 321J NEWTON MA
2016-08-10 857-336-9XXX 9000–9999Assigned HD CARRIER LLC 321J WINTHROP MA
2016-08-10 857-363-4XXX 4000–4999Assigned HD CARRIER LLC 321J EVERETT 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.