NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

6 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 313
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 4
OPENTACT INC. 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
2023-06-22 313-698-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2023-06-20 313-435-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2023-06-20 313-435-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2023-06-12 313-726-3XXX 3000–3999Assigned BOOST SUBSCRIBERCO L.L.C. 490J DETROITZN6 MI
2023-06-12 313-787-7XXX 7000–7999Assigned BOOST SUBSCRIBERCO L.L.C. 490J DETROITZN6 MI
2023-06-08 313-708-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2023-06-02 313-370-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2023-05-26 313-210-0XXX 0000–0999Assigned FIVE9, INC. 598J DETROITZN1 MI
2023-05-24 313-787-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN6 MI
2023-05-22 313-787-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2023-05-22 313-787-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2023-05-22 313-787-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2023-05-17 313-370-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-05-17 313-370-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-05-17 313-370-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-05-17 313-370-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-05-15 313-604-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2023-05-15 313-787-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2023-05-04 313-787-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2023-04-04 313-391-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2023-04-04 313-761-0XXX 0000–0999Assigned FIVE9, INC. 598J DETROITZN1 MI
2023-03-22 313-773-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-03-22 313-817-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-03-22 313-844-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-03-08 313-604-0XXX 0000–0999Assigned LEAP TELECOM, LLC 616J DETROITZN1 MI
2023-03-03 313-370-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-03-03 313-370-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-03-03 313-370-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2023-03-02 313-696-0XXX 0000–0999Assigned NUSO, LLC 732J DETROITZN4 MI
2023-02-23 313-708-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2023-02-23 313-708-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2023-02-23 313-708-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2023-02-21 313-708-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN2 MI
2023-02-21 313-708-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN2 MI
2023-02-21 313-787-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN6 MI
2023-02-21 313-787-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN6 MI
2023-02-21 313-787-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN6 MI
2023-02-06 313-698-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2023-02-06 313-698-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2023-02-06 313-698-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2023-01-31 313-696-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN4 MI
2023-01-31 313-713-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN5 MI
2023-01-24 313-586-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2023-01-13 313-215-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-01-13 313-326-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-01-13 313-352-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-01-13 313-428-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-01-13 313-472-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2023-01-10 313-726-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2023-01-10 313-726-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN6 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.