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
2012-04-19 586-248-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J RICHMOND MI
2012-03-20 586-381-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C WARREN MI
2012-03-20 586-806-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2012-03-07 586-276-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2012-03-07 586-359-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2012-03-07 586-359-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2012-03-05 586-473-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ARMADA MI
2012-02-07 586-859-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ROSEVILLE MI
2012-01-31 586-510-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C CENTERLINE MI
2012-01-30 586-232-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2012-01-17 586-684-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWBALTIMR MI
2012-01-11 586-625-3XXX 3000–3999Assigned METROPCS, INC. 5562 ARMADA MI
2012-01-06 586-480-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2012-01-06 586-480-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2011-12-27 586-961-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2011-12-09 586-244-7XXX 7000–7999Assigned METROPCS, INC. 5562 NEW HAVEN MI
2011-12-09 586-533-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2011-12-09 586-684-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J NEWBALTIMR MI
2011-12-09 586-690-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2011-12-08 586-430-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J RICHMOND MI
2011-12-08 586-991-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2011-12-01 586-277-9XXX 9000–9999Assigned METROPCS, INC. 5562 NEW HAVEN MI
2011-12-01 586-588-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ARMADA MI
2011-12-01 586-684-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NEWBALTIMR MI
2011-11-18 586-277-8XXX 8000–8999Assigned METROPCS, INC. 5562 NEW HAVEN MI
2011-11-16 586-473-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ARMADA MI
2011-11-09 586-846-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2011-11-09 586-920-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2011-10-18 586-277-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEW HAVEN MI
2011-09-28 586-846-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2011-09-22 586-359-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2011-08-31 586-480-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WARREN MI
2011-08-15 586-281-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ROMEO MI
2011-08-12 586-745-5XXX 5000–5999Assigned METROPCS, INC. 5562 WASHINGTON MI
2011-08-09 586-697-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WASHINGTON MI
2011-08-03 586-960-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROMEO MI
2011-07-27 586-799-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2011-07-19 586-690-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2011-06-09 586-467-6XXX 6000–6999Assigned MICHIGAN BELL TEL CO 9323 CENTERLINE MI
2011-06-09 586-467-7XXX 7000–7999Assigned MICHIGAN BELL TEL CO 9323 CENTERLINE MI
2011-06-09 586-467-8XXX 8000–8999Assigned MICHIGAN BELL TEL CO 9323 CENTERLINE MI
2011-06-09 586-834-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2011-06-09 586-834-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2011-06-03 586-859-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2011-05-31 586-232-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2011-05-31 586-277-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEW HAVEN MI
2011-05-31 586-372-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROMEO MI
2011-05-31 586-436-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2011-05-31 586-436-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2011-05-27 586-884-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E UTICA 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.