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
2021-06-14 313-591-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2021-06-14 313-644-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2021-06-14 313-644-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2021-06-14 313-944-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2021-06-14 313-944-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2021-06-14 313-944-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2021-06-14 313-944-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2021-06-03 313-380-9XXX 9000–9999Assigned COMMIO, LLC 939H DETROITZN6 MI
2021-06-03 313-476-0XXX 0000–0999Assigned COMMIO, LLC 939H DETROITZN6 MI
2021-06-03 313-476-8XXX 8000–8999Assigned COMMIO, LLC 939H DETROITZN6 MI
2021-06-03 313-476-9XXX 9000–9999Assigned COMMIO, LLC 939H DETROITZN6 MI
2021-06-03 313-524-7XXX 7000–7999Assigned SKYE TELECOM LLC DBA SKYETEL 622J DETROITZN1 MI
2021-06-03 313-524-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2021-06-03 313-524-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2021-06-02 313-547-9XXX 9000–9999Assigned HD CARRIER LLC 321J DETROITZN5 MI
2021-05-19 313-536-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2021-05-19 313-536-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2021-05-19 313-536-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2021-05-19 313-536-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2021-05-17 313-476-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN6 MI
2021-05-17 313-536-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN4 MI
2021-05-17 313-542-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN5 MI
2021-05-17 313-548-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN2 MI
2021-05-17 313-644-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN3 MI
2021-05-07 313-548-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2021-05-06 313-542-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2021-05-05 313-380-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D DETROITZN6 MI
2021-05-05 313-380-7XXX 7000–7999Assigned VONAGE AMERICA LLC 197D DETROITZN6 MI
2021-05-05 313-548-5XXX 5000–5999Assigned VONAGE AMERICA LLC 197D DETROITZN2 MI
2021-05-05 313-548-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D DETROITZN2 MI
2021-04-28 313-380-8XXX 8000–8999Assigned STRATUS NETWORKS 495J DETROITZN6 MI
2021-04-28 313-542-8XXX 8000–8999Assigned STRATUS NETWORKS 495J DETROITZN5 MI
2021-04-28 313-644-8XXX 8000–8999Assigned STRATUS NETWORKS 495J DETROITZN3 MI
2021-04-22 313-524-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2021-04-22 313-524-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2021-04-22 313-524-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H DETROITZN1 MI
2021-04-14 313-644-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2021-04-14 313-644-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2021-04-14 313-644-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2021-04-14 313-644-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2021-04-14 313-644-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2021-04-13 313-542-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2021-04-13 313-542-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2021-04-13 313-569-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2021-04-13 313-569-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2021-04-07 313-254-7XXX 7000–7999Assigned TERRA NOVA TELECOM INC. 145J DETROITZN6 MI
2021-04-07 313-743-6XXX 6000–6999Assigned TERRA NOVA TELECOM INC. 145J DETROITZN2 MI
2021-04-07 313-859-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2021-04-07 313-859-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2021-04-05 313-944-4XXX 4000–4999Assigned FRACTEL, LLC 965H 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.