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
2014-09-24 586-343-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2014-09-24 586-343-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2014-09-24 586-930-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C UTICA MI
2014-09-24 586-930-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C UTICA MI
2014-09-15 586-383-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-438-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-480-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-481-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-481-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-482-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-565-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-567-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-576-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2014-09-15 586-576-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2014-09-15 586-668-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-918-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-918-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-946-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-946-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-994-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-15 586-995-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2014-09-05 586-213-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MT CLEMENS MI
2014-09-05 586-930-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2014-08-28 586-553-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2014-08-28 586-843-1XXX 1000–1999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 UTICA MI
2014-08-27 586-213-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2014-08-27 586-213-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2014-08-27 586-213-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2014-08-14 586-981-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2014-08-11 586-217-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2014-08-11 586-574-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2014-08-11 586-960-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROMEO MI
2014-08-06 586-200-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROSEVILLE MI
2014-08-05 586-636-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E RICHMOND MI
2014-08-04 586-221-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2014-07-21 586-337-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMEO MI
2014-07-21 586-625-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ARMADA MI
2014-07-08 586-992-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WASHINGTON MI
2014-07-02 586-213-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-07-01 586-475-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-07-01 586-475-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
2014-06-27 586-200-5XXX 5000–5999Assigned 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.