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 586
NEW CINGULAR WIRELESS PCS, LLC - IL 1
INTRADO COMMUNICATIONS, 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
2014-05-20 586-659-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-05-13 586-200-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2014-05-13 586-225-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2014-05-13 586-225-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2014-05-06 586-200-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2014-05-01 586-221-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-05-01 586-331-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ROMEO MI
2014-04-18 586-636-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G RICHMOND MI
2014-04-15 586-200-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ROSEVILLE MI
2014-04-15 586-281-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ROMEO MI
2014-04-14 586-261-8XXX 8000–8999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G CENTERLINE MI
2014-04-11 586-217-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2014-04-10 586-221-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2014-04-08 586-221-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-04-07 586-217-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2014-04-07 586-217-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2014-04-07 586-262-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2014-04-07 586-262-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2014-04-07 586-359-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2014-04-07 586-393-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2014-04-07 586-393-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2014-04-04 586-210-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G NEWBALTIMR MI
2014-04-04 586-315-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G NEW HAVEN MI
2014-04-04 586-745-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G WASHINGTON MI
2014-04-04 586-843-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G UTICA MI
2014-04-02 586-217-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2014-03-19 586-221-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2014-03-06 586-210-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NEWBALTIMR MI
2014-03-06 586-221-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MT CLEMENS MI
2014-03-04 586-315-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NEW HAVEN MI
2014-03-04 586-430-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 RICHMOND MI
2014-03-04 586-745-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WASHINGTON MI
2014-03-03 586-225-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CENTERLINE MI
2014-03-03 586-225-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CENTERLINE MI
2014-02-26 586-262-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E UTICA MI
2014-02-26 586-330-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWBALTIMR MI
2014-02-26 586-353-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2014-02-26 586-482-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2014-02-26 586-745-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2014-02-24 586-331-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ROMEO MI
2014-02-24 586-359-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ROSEVILLE MI
2014-02-20 586-393-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CENTERLINE MI
2014-02-17 586-662-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-02-17 586-662-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-02-17 586-663-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-02-17 586-663-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-02-17 586-884-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2014-01-08 586-359-5XXX 5000–5999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2014-01-08 586-359-7XXX 7000–7999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2013-12-13 586-343-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI

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.