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
2020-09-09 313-688-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-09-09 313-688-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-09-09 313-688-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-09-09 313-688-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2020-09-03 313-479-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2020-09-03 313-479-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN6 MI
2020-09-03 313-513-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-513-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2020-09-03 313-631-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-631-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2020-09-03 313-634-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-634-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2020-09-03 313-763-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-09-03 313-763-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-19 313-450-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2020-08-19 313-512-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2020-08-19 313-512-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2020-08-19 313-512-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 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.