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
2018-07-09 313-356-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2018-07-09 313-449-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2018-07-09 313-466-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2018-06-27 313-364-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-06-19 313-379-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-06-13 313-518-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2018-06-13 313-518-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2018-06-13 313-518-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2018-06-13 313-518-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2018-06-13 313-518-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2018-04-24 313-332-7XXX 7000–7999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN2 MI
2018-04-03 313-364-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-03-28 313-416-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-03-09 313-856-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-03-05 313-497-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-03-05 313-497-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-03-05 313-771-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-03-05 313-771-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-03-05 313-771-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-03-05 313-771-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-03-05 313-992-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-02-14 313-747-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-01-16 313-314-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2018-01-16 313-314-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2018-01-16 313-403-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-01-16 313-403-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-01-05 313-296-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2018-01-05 313-296-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2017-12-18 313-356-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2017-12-18 313-356-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2017-12-06 313-518-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2017-12-06 313-518-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2017-11-21 313-635-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2017-11-14 313-379-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2017-11-14 313-379-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2017-11-10 313-636-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2017-11-10 313-636-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2017-11-10 313-636-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2017-11-10 313-666-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2017-11-10 313-666-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2017-11-10 313-666-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2017-11-10 313-666-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2017-11-08 313-825-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2017-11-08 313-825-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2017-11-08 313-921-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2017-11-08 313-923-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2017-11-01 313-466-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-11-01 313-509-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-11-01 313-509-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-09-28 313-329-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 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.