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
2006-09-22 586-948-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2006-09-22 586-948-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2006-08-16 586-623-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROMEO MI
2006-08-10 586-718-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2006-08-10 586-718-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2006-08-07 586-276-9XXX 9000–9999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 WARREN MI
2006-08-07 586-350-2XXX 2000–2999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 ROSEVILLE MI
2006-08-07 586-372-3XXX 3000–3999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 ROMEO MI
2006-08-07 586-619-3XXX 3000–3999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 CENTERLINE MI
2006-08-07 586-649-6XXX 6000–6999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 MT CLEMENS MI
2006-08-07 586-884-5XXX 5000–5999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 UTICA MI
2006-06-16 586-879-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
2006-06-12 586-619-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2006-06-12 586-619-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2006-06-12 586-843-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2006-06-12 586-991-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2006-06-08 586-913-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C MT CLEMENS MI
2006-05-25 586-248-7XXX 7000–7999Assigned CYNERGYCOMM.NET, INC. - MI 9245 RICHMOND MI
2006-05-17 586-276-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WARREN MI
2006-03-31 586-913-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2006-03-30 586-438-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J WARREN MI
2006-03-30 586-737-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J UTICA MI
2006-03-24 586-421-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2006-03-24 586-421-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2006-03-23 586-232-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WASHINGTON MI
2006-03-23 586-232-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WASHINGTON MI
2006-03-23 586-745-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C WASHINGTON MI
2006-03-16 586-741-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J MT CLEMENS MI
2006-03-15 586-585-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2006-03-15 586-585-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2006-03-09 586-859-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ROSEVILLE MI
2006-02-27 586-744-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2006-02-27 586-744-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2006-02-08 586-746-8XXX 8000–8999Assigned METROPCS, INC. 5562 MT CLEMENS MI
2006-02-06 586-372-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ROMEO MI
2006-02-06 586-646-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C NEW HAVEN MI
2006-02-06 586-648-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NEWBALTIMR MI
2006-02-06 586-799-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C UTICA MI
2006-01-31 586-486-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CENTERLINE MI
2006-01-16 586-648-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NEWBALTIMR MI
2006-01-12 586-362-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J ROSEVILLE MI
2006-01-10 586-840-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2006-01-09 586-913-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2006-01-09 586-913-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2006-01-04 586-222-1XXX 1000–1999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2006-01-04 586-222-2XXX 2000–2999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2006-01-04 586-222-3XXX 3000–3999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2006-01-04 586-222-4XXX 4000–4999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2006-01-04 586-222-5XXX 5000–5999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2006-01-04 586-222-6XXX 6000–6999Assigned METROPCS, INC. 5562 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.