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
2016-06-10 313-420-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2016-06-10 313-424-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2016-05-31 313-261-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2016-04-18 313-326-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C DETROITZN5 MI
2016-04-15 313-284-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2016-04-15 313-284-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2016-04-15 313-284-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2016-04-15 313-314-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2016-04-15 313-314-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2016-04-15 313-314-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2016-04-15 313-636-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2016-04-11 313-261-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2016-04-11 313-261-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2016-04-11 313-261-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2016-04-11 313-261-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2016-04-11 313-261-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2016-04-11 313-635-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2016-04-11 313-653-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2016-04-05 313-395-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DETROITZN6 MI
2016-04-05 313-635-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2016-04-05 313-635-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2016-03-29 313-261-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2016-03-29 313-261-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2016-03-29 313-315-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2016-03-29 313-315-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2016-03-29 313-509-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2016-03-29 313-666-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2016-03-29 313-666-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2016-03-29 313-788-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2016-03-29 313-788-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2016-03-23 313-509-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C DETROITZN2 MI
2016-03-14 313-800-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DETROITZN1 MI
2016-03-11 313-800-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2016-03-08 313-315-3XXX 3000–3999Assigned TELNET WORLDWIDE, INC. 817J DETROITZN5 MI
2016-03-08 313-788-7XXX 7000–7999Assigned TELNET WORLDWIDE, INC. 817J DETROITZN3 MI
2016-03-02 313-315-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2016-02-25 313-635-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DETROITZN4 MI
2016-02-12 313-666-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2016-02-12 313-666-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2016-02-11 313-509-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2016-02-11 313-509-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2016-02-11 313-800-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2016-02-11 313-800-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2016-02-11 313-992-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2016-02-11 313-992-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2016-01-14 313-509-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2016-01-08 313-398-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2016-01-08 313-398-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2016-01-08 313-788-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2016-01-08 313-788-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 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.