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
2014-08-11 313-858-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2014-08-11 313-858-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2014-08-07 313-228-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2014-08-07 313-335-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2014-08-07 313-343-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2014-08-07 313-349-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2014-08-07 313-723-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2014-08-05 313-438-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J DETROITZN6 MI
2014-08-04 313-349-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2014-08-04 313-723-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2014-07-25 313-960-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2014-07-02 313-466-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C DETROITZN2 MI
2014-06-23 313-246-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2014-06-23 313-293-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2014-06-23 313-307-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2014-06-23 313-429-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2014-06-23 313-432-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2014-06-12 313-723-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DETROITZN4 MI
2014-05-13 313-277-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2014-05-13 313-908-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2014-05-06 313-327-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2014-05-06 313-914-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2014-04-16 313-307-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C DETROITZN4 MI
2014-04-08 313-427-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DETROITZN6 MI
2014-03-19 313-246-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2014-03-19 313-307-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2014-03-19 313-466-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2014-03-19 313-749-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2014-03-17 313-349-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DETROITZN3 MI
2014-03-17 313-732-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DETROITZN2 MI
2014-03-06 313-438-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2014-03-06 313-438-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2014-03-06 313-502-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2014-03-06 313-502-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2014-03-06 313-502-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2014-03-06 313-502-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2014-03-06 313-502-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2014-03-06 313-502-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2014-03-06 313-633-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2014-03-06 313-633-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2014-02-26 313-327-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2014-02-24 313-296-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DETROITZN5 MI
2014-02-07 313-263-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2014-01-29 313-324-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2014-01-28 313-246-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2014-01-28 313-307-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2014-01-28 313-324-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2014-01-28 313-466-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2014-01-28 313-769-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2014-01-16 313-307-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J 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.