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
2020-04-02 857-297-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTON MA
2020-04-02 857-423-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BROOKLINE MA
2020-04-02 857-423-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BROOKLINE MA
2020-03-27 857-358-7XXX 7000–7999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F QUINCY MA
2020-03-24 857-358-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
2020-03-24 857-358-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
2020-03-24 857-359-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-24 857-359-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-19 857-290-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D NEWTON MA
2020-03-19 857-290-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D NEWTON MA
2020-03-16 857-353-9XXX 9000–9999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F BOSTON MA
2020-03-16 857-357-0XXX 0000–0999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F CAMBRIDGE MA
2020-03-16 857-423-7XXX 7000–7999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F BROOKLINE MA
2020-02-18 857-297-9XXX 9000–9999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F NEWTON MA
2020-02-18 857-322-0XXX 0000–0999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F EASTBOSTON MA
2020-02-18 857-423-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BROOKLINE MA
2020-02-14 857-353-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-02-14 857-353-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-01-31 857-353-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-01-31 857-353-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D BOSTON MA
2020-01-31 857-995-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SOMERVILLE MA
2020-01-14 857-285-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CAMBRIDGE MA
2020-01-06 857-353-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2020-01-06 857-353-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2020-01-06 857-353-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2019-12-27 857-357-1XXX 1000–1999Assigned MEGAPHONE, INC. 007J CAMBRIDGE MA
2019-12-23 857-703-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HYDE PARK MA
2019-12-17 857-557-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D BOSTON MA
2019-12-17 857-557-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D BOSTON MA
2019-12-06 857-557-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2019-12-03 857-423-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2019-11-29 857-356-3XXX 3000–3999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F BOSTON MA
2019-11-19 857-344-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2019-11-19 857-344-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2019-11-19 857-344-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2019-10-30 857-331-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2019-10-30 857-331-9XXX 9000–9999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2019-10-29 857-356-0XXX 0000–0999Assigned INTRADO COMMUNICATIONS, LLC 116E BOSTON MA
2019-10-29 857-356-1XXX 1000–1999Assigned INTRADO COMMUNICATIONS, LLC 116E BOSTON MA
2019-10-29 857-356-2XXX 2000–2999Assigned INTRADO COMMUNICATIONS, LLC 116E BOSTON MA
2019-10-29 857-557-1XXX 1000–1999Assigned INTRADO COMMUNICATIONS, LLC 116E BOSTON MA
2019-10-21 857-557-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D BOSTON MA
2019-10-21 857-557-7XXX 7000–7999Assigned 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.