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
2005-05-27 313-772-4XXX 4000–4999Assigned WOW! INTERNET, CABLE AND PHONE 961J DETROITZN4 MI
2005-05-05 313-879-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2005-05-05 313-879-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2005-05-05 313-879-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2005-04-29 313-447-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN2 MI
2005-04-29 313-447-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN2 MI
2005-04-08 313-262-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN1 MI
2005-04-08 313-262-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN1 MI
2005-04-08 313-447-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2005-04-08 313-447-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2005-04-08 313-447-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2005-04-08 313-486-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN5 MI
2005-04-08 313-486-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN5 MI
2005-04-08 313-486-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN5 MI
2005-04-08 313-651-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN4 MI
2005-04-08 313-731-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN3 MI
2005-04-08 313-731-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN3 MI
2005-04-08 313-731-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN3 MI
2005-04-08 313-772-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN4 MI
2005-04-08 313-772-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN4 MI
2005-04-08 313-772-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN4 MI
2005-03-30 313-447-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2005-03-30 313-447-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2005-03-18 313-915-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2005-03-18 313-915-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2005-03-14 313-216-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J DETROITZN6 MI
2005-03-14 313-262-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J DETROITZN1 MI
2005-03-14 313-423-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J DETROITZN2 MI
2005-02-28 313-293-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2005-02-15 313-332-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J DETROITZN2 MI
2005-02-15 313-334-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DETROITZN3 MI
2005-02-11 313-334-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN3 MI
2005-02-11 313-486-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI
2005-02-10 313-486-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI
2005-02-02 313-687-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2005-01-26 313-449-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2005-01-19 313-405-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2005-01-19 313-405-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2005-01-19 313-405-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2005-01-19 313-405-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2005-01-19 313-405-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2005-01-18 313-449-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2005-01-18 313-449-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2005-01-18 313-468-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2004-12-17 313-279-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J DETROITZN4 MI
2004-12-17 313-281-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DETROITZN3 MI
2004-12-08 313-758-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2004-12-03 313-254-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
2004-12-02 313-409-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
2004-12-02 313-409-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 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.