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
2018-10-25 857-348-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-19 857-425-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2018-10-19 857-425-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D BRIGHTON MA
2018-10-18 857-856-0XXX 0000–0999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2018-10-18 857-856-1XXX 1000–1999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2018-10-09 857-332-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-332-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-332-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-332-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-332-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-332-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-332-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-338-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-338-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-338-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-10-09 857-386-8XXX 8000–8999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F CHELSEA MA
2018-10-04 857-332-1XXX 1000–1999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2018-10-04 857-332-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2018-10-01 857-290-9XXX 9000–9999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F NEWTON MA
2018-10-01 857-386-1XXX 1000–1999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F CHELSEA MA
2018-10-01 857-663-9XXX 9000–9999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F DORCHESTER MA
2018-10-01 857-760-6XXX 6000–6999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F WATERTOWN MA
2018-09-26 857-326-1XXX 1000–1999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-2XXX 2000–2999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-3XXX 3000–3999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-4XXX 4000–4999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-25 857-331-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2018-09-21 857-349-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E WINTHROP MA
2018-09-14 857-347-2XXX 2000–2999Assigned NUSO, LLC 551G BOSTON MA
2018-09-14 857-348-2XXX 2000–2999Assigned NUSO, LLC 551G BOSTON MA
2018-09-07 857-320-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2018-09-07 857-347-1XXX 1000–1999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2018-09-07 857-348-0XXX 0000–0999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2018-08-16 857-425-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J BRIGHTON MA
2018-08-14 857-348-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-14 857-348-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-14 857-348-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-14 857-348-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-09 857-290-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D NEWTON MA
2018-08-09 857-347-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-09 857-347-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-09 857-347-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-09 857-347-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2018-08-09 857-524-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D SO BOSTON MA
2018-08-08 857-347-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D BOSTON MA
2018-08-06 857-322-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 EASTBOSTON MA
2018-08-06 857-331-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2018-08-06 857-347-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D 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.