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
2019-02-27 313-397-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2019-02-27 313-751-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2019-02-27 313-751-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2019-02-27 313-765-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2019-02-27 313-789-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2019-02-08 313-771-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN1 MI
2019-02-06 313-725-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN1 MI
2019-02-06 313-751-3XXX 3000–3999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN5 MI
2019-02-04 313-217-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2019-02-04 313-306-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2019-02-04 313-725-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2019-02-04 313-765-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2019-02-04 313-765-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2019-01-22 313-725-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2018-12-17 313-751-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-12-17 313-751-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-12-17 313-751-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-12-13 313-403-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-12-13 313-403-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-12-13 313-558-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-12-13 313-666-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-11-29 313-771-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-11-29 313-816-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-11-29 313-816-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-11-29 313-816-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-11-29 313-816-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-11-14 313-306-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-11-14 313-306-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-11-14 313-771-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-11-07 313-403-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-11-01 313-217-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2018-10-26 313-816-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-10-26 313-816-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-10-26 313-816-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-10-26 313-816-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-10-26 313-816-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-10-18 313-497-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-10-18 313-497-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-10-18 313-497-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-10-18 313-497-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-10-18 313-497-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-10-02 313-395-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-10-02 313-403-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-10-02 313-403-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-10-02 313-403-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-10-02 313-403-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2018-10-01 313-217-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN2 MI
2018-10-01 313-306-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN4 MI
2018-10-01 313-356-7XXX 7000–7999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN3 MI
2018-10-01 313-765-8XXX 8000–8999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G 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.