NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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, all time — NPA 351
ONVOY, LLC - MA 285
OMNIPOINT MIAMI E LICENSE, LLC 83
ONVOY SPECTRUM, LLC 74
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 40
PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 37
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
2021-01-26 351-900-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H IPSWICH MA
2021-01-20 351-277-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D LAWRENCE MA
2021-01-20 351-277-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D LAWRENCE MA
2021-01-20 351-277-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D LAWRENCE MA
2020-11-19 351-215-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 HAVERHILL MA
2020-10-19 351-500-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LOWELL MA
2020-10-19 351-500-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LOWELL MA
2020-10-19 351-500-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LOWELL MA
2020-10-19 351-500-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J LOWELL MA
2020-10-12 351-800-1XXX 1000–1999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F WINCHENDON MA
2020-10-08 351-215-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 HAVERHILL MA
2020-08-25 351-209-6XXX 6000–6999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
2020-08-25 351-209-7XXX 7000–7999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
2020-07-27 351-356-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEOMINSTER MA
2020-07-27 351-356-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEOMINSTER MA
2020-07-23 351-209-5XXX 5000–5999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
2020-07-22 351-356-7XXX 7000–7999Assigned FRACTEL, LLC 965H LEOMINSTER MA
2020-07-22 351-356-9XXX 9000–9999Assigned FRACTEL, LLC 965H LEOMINSTER MA
2020-07-22 351-900-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D IPSWICH MA
2020-07-22 351-900-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D IPSWICH MA
2020-06-24 351-209-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H ACTON MA
2020-06-24 351-209-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H ACTON MA
2020-06-11 351-200-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D ASHBY MA
2020-06-10 351-216-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAMILTON MA
2020-05-26 351-208-2XXX 2000–2999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F LOWELL MA
2020-05-26 351-247-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D LUNENBURG MA
2020-05-26 351-247-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D LUNENBURG MA
2020-05-26 351-529-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D MERRIMAC MA
2020-05-26 351-529-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D MERRIMAC MA
2020-05-26 351-529-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D MERRIMAC MA
2020-05-12 351-215-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 HAVERHILL MA
2020-05-11 351-400-0XXX 0000–0999Assigned FRACTEL, LLC 965H ESSEX MA
2020-05-11 351-400-4XXX 4000–4999Assigned FRACTEL, LLC 965H ESSEX MA
2020-05-11 351-500-0XXX 0000–0999Assigned FRACTEL, LLC 965H LOWELL MA
2020-05-11 351-500-5XXX 5000–5999Assigned FRACTEL, LLC 965H LOWELL MA
2020-05-11 351-529-3XXX 3000–3999Assigned FRACTEL, LLC 965H MERRIMAC MA
2020-05-11 351-529-9XXX 9000–9999Assigned FRACTEL, LLC 965H MERRIMAC MA
2020-05-11 351-600-0XXX 0000–0999Assigned FRACTEL, LLC 965H PEABODY MA
2020-05-11 351-600-6XXX 6000–6999Assigned FRACTEL, LLC 965H PEABODY MA
2020-05-11 351-800-0XXX 0000–0999Assigned FRACTEL, LLC 965H WINCHENDON MA
2020-05-11 351-800-8XXX 8000–8999Assigned FRACTEL, LLC 965H WINCHENDON MA
2020-05-11 351-900-0XXX 0000–0999Assigned FRACTEL, LLC 965H IPSWICH MA
2020-05-11 351-900-9XXX 9000–9999Assigned FRACTEL, LLC 965H IPSWICH MA
2020-04-28 351-215-0XXX 0000–0999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F HAVERHILL MA
2020-03-19 351-200-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D ASHBY MA
2020-03-19 351-200-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D ASHBY MA
2020-03-19 351-200-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D ASHBY MA
2020-03-19 351-247-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D LUNENBURG MA
2020-03-19 351-247-4XXX 4000–4999Assigned ONVOY, LLC - MA 892D LUNENBURG MA
2020-03-19 351-444-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D IPSWICH MA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.