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
2018-08-06 857-347-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D BOSTON MA
2018-07-16 857-347-0XXX 0000–0999Assigned ADVANCED TELECOM SOLUTIONS, LLC 181J BOSTON MA
2018-07-09 857-343-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-424-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROXBURY MA
2018-06-28 857-346-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BOSTON MA
2018-06-22 857-346-1XXX 1000–1999Assigned NUSO, LLC 551G BOSTON MA
2018-06-20 857-346-3XXX 3000–3999Assigned METROPCS, INC. 5562 BOSTON MA
2018-06-20 857-346-4XXX 4000–4999Assigned METROPCS, INC. 5562 BOSTON MA
2018-06-20 857-346-5XXX 5000–5999Assigned METROPCS, INC. 5562 BOSTON MA
2018-05-24 857-346-0XXX 0000–0999Assigned TELENGY LLC 148J BOSTON MA
2018-05-17 857-290-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D NEWTON MA
2018-05-17 857-343-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BOSTON MA
2018-05-17 857-344-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D QUINCY MA
2018-05-07 857-296-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-03-22 857-352-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BROOKLINE MA
2018-03-20 857-361-5XXX 5000–5999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F BROOKLINE MA
2018-03-20 857-773-2XXX 2000–2999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F JAMAICA PL MA
2018-02-14 857-343-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-02-14 857-343-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-02-14 857-343-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-02-09 857-419-4XXX 4000–4999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F MILTON MA
2018-02-07 857-338-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-02-06 857-322-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D EASTBOSTON MA
2018-02-01 857-299-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D BELMONT MA
2018-02-01 857-338-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2018-02-01 857-338-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2018-01-29 857-757-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CAMBRIDGE MA
2018-01-29 857-757-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CAMBRIDGE MA
2018-01-29 857-757-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CAMBRIDGE MA
2018-01-29 857-757-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CAMBRIDGE MA
2018-01-26 857-338-8XXX 8000–8999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2018-01-26 857-338-9XXX 9000–9999Assigned TC SYSTEMS, INC. 7135 BOSTON MA
2018-01-16 857-332-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-01-02 857-329-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2017-12-15 857-326-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D BOSTON MA
2017-12-15 857-326-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D BOSTON MA
2017-12-11 857-499-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY 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.