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
2016-08-10 857-385-0XXX 0000–0999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-08-10 857-385-1XXX 1000–1999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-08-10 857-385-4XXX 4000–4999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-08-10 857-385-5XXX 5000–5999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-08-10 857-385-7XXX 7000–7999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-08-10 857-403-5XXX 5000–5999Assigned HD CARRIER LLC 321J QUINCY MA
2016-08-10 857-414-0XXX 0000–0999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-2XXX 2000–2999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-3XXX 3000–3999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-4XXX 4000–4999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-5XXX 5000–5999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-6XXX 6000–6999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-8XXX 8000–8999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-414-9XXX 9000–9999Assigned HD CARRIER LLC 321J BRIGHTON MA
2016-08-10 857-523-4XXX 4000–4999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-08-10 857-997-1XXX 1000–1999Assigned HD CARRIER LLC 321J SOMERVILLE MA
2016-08-09 857-419-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
2016-08-09 857-763-1XXX 1000–1999Assigned NUSO, LLC 551G BOSTON MA
2016-08-09 857-763-2XXX 2000–2999Assigned NUSO, LLC 551G BOSTON MA
2016-08-09 857-763-3XXX 3000–3999Assigned NUSO, LLC 551G BOSTON MA
2016-08-09 857-763-4XXX 4000–4999Assigned NUSO, LLC 551G BOSTON MA
2016-08-09 857-763-5XXX 5000–5999Assigned NUSO, LLC 551G BOSTON MA
2016-08-05 857-386-2XXX 2000–2999Assigned VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
2016-08-05 857-386-3XXX 3000–3999Assigned VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
2016-07-28 857-772-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-28 857-772-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-28 857-772-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-28 857-772-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-28 857-772-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-28 857-772-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-28 857-772-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-25 857-763-6XXX 6000–6999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2016-07-25 857-763-7XXX 7000–7999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2016-07-25 857-763-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2016-07-25 857-763-9XXX 9000–9999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2016-07-21 857-762-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2016-07-21 857-762-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-21 857-762-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-21 857-762-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-21 857-762-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-07-21 857-762-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2016-07-21 857-762-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2016-07-21 857-762-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2016-07-21 857-762-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2016-07-19 857-762-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-13 857-406-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-13 857-406-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-13 857-406-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-06 857-971-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-07-06 857-971-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D CHARLESTN 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.