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
2020-12-09 313-480-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-12-09 313-480-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-12-08 313-678-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-12-08 313-678-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-11-24 313-688-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-11-24 313-688-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-11-24 313-688-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-11-24 313-688-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-11-18 313-756-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-11-18 313-756-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-11-18 313-756-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-11-18 313-756-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-11-18 313-998-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN1 MI
2020-11-05 313-591-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN3 MI
2020-11-04 313-479-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-11-04 313-479-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-11-04 313-479-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-11-04 313-479-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-11-04 313-479-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-11-04 313-479-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2020-11-04 313-512-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-11-04 313-512-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-11-04 313-512-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-11-04 313-512-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-11-04 313-512-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-11-04 313-512-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2020-11-04 313-552-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-11-04 313-552-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-11-04 313-552-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-11-04 313-552-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-11-04 313-998-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-11-04 313-998-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-10-29 313-552-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2020-10-29 313-552-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2020-10-29 313-552-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2020-10-29 313-552-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2020-10-23 313-479-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2020-10-15 313-591-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2020-10-15 313-591-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2020-10-15 313-591-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2020-10-09 313-351-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2020-09-30 313-552-9XXX 9000–9999Assigned HD CARRIER LLC 321J DETROITZN1 MI
2020-09-25 313-998-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-09-10 313-998-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-10 313-998-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-10 313-998-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-10 313-998-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-10 313-998-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-10 313-998-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-09 313-688-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 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.