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
2012-06-25 857-268-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2012-06-25 857-404-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-25 857-404-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-25 857-404-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-25 857-404-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-25 857-404-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-25 857-404-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-15 857-206-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BOSTON MA
2012-06-15 857-250-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BOSTON MA
2012-06-07 857-404-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-07 857-404-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-06-05 857-250-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2012-06-05 857-259-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2012-06-05 857-939-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2012-05-31 857-250-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BOSTON MA
2012-05-24 857-999-3XXX 3000–3999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F CAMBRIDGE MA
2012-05-24 857-999-9XXX 9000–9999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F CAMBRIDGE MA
2012-05-21 857-259-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2012-05-21 857-404-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-05-21 857-636-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-05-15 857-208-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2012-05-15 857-208-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2012-05-09 857-636-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-05-09 857-636-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-05-08 857-232-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-232-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-240-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-255-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-05-08 857-255-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D NEWTON MA
2012-04-30 857-293-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EASTBOSTON MA
2012-04-18 857-242-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J CAMBRIDGE MA
2012-04-06 857-230-6XXX 6000–6999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 ROXBURY MA
2012-04-04 857-636-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
2012-03-29 857-250-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BOSTON MA
2012-03-09 857-219-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D NEWTON 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.