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
2020-08-19 313-637-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-08-19 313-646-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-08-19 313-678-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-678-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2020-08-19 313-766-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-19 313-825-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-08-19 313-889-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-19 313-942-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-13 313-254-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-08-13 313-254-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-08-13 313-422-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-08-13 313-458-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-08-13 313-474-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-08-13 313-497-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-13 313-497-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-13 313-546-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-08-13 313-546-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-08-13 313-546-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-08-13 313-546-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-08-13 313-546-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-08-13 313-733-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-08-13 313-736-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-08-13 313-769-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-08-13 313-923-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-08-11 313-263-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2020-08-10 313-351-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-08-10 313-351-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-08-10 313-351-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-08-10 313-362-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-10 313-362-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-10 313-385-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2020-08-10 313-385-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2020-08-10 313-546-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2020-08-10 313-546-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2020-07-23 313-518-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2020-07-23 313-856-8XXX 8000–8999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2020-07-23 313-856-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2020-07-06 313-546-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-07-06 313-546-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-06-25 313-385-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2020-06-25 313-385-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2020-06-25 313-385-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2020-06-25 313-385-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2020-06-22 313-946-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 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.