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
2006-01-04 313-926-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-926-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-926-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-982-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2005-12-28 313-305-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J DETROITZN3 MI
2005-12-19 313-254-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2005-12-12 313-416-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J DETROITZN4 MI
2005-12-09 313-221-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2005-12-09 313-221-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2005-12-06 313-334-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN3 MI
2005-12-06 313-334-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN3 MI
2005-12-06 313-486-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI
2005-12-06 313-486-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI
2005-12-06 313-486-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI
2005-11-22 313-256-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J DETROITZN1 MI
2005-11-22 313-732-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J DETROITZN2 MI
2005-11-08 313-335-5XXX 5000–5999Assigned ACD TELECOM, INC. - MI 3535 DETROITZN1 MI
2005-11-08 313-404-4XXX 4000–4999Assigned ACD TELECOM, INC. - MI 3535 DETROITZN5 MI
2005-11-08 313-422-2XXX 2000–2999Assigned ACD TELECOM, INC. - MI 3535 DETROITZN3 MI
2005-11-08 313-425-9XXX 9000–9999Assigned ACD TELECOM, INC. - MI 3535 DETROITZN6 MI
2005-11-08 313-499-7XXX 7000–7999Assigned ACD TELECOM, INC. - MI 3535 DETROITZN2 MI
2005-11-08 313-544-5XXX 5000–5999Assigned ACD TELECOM, INC. - MI 3535 DETROITZN4 MI
2005-10-11 313-216-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DETROITZN6 MI
2005-10-11 313-221-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-305-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J DETROITZN3 MI
2005-10-11 313-416-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J DETROITZN4 MI
2005-10-11 313-459-1XXX 1000–1999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-8XXX 8000–8999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-459-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN1 MI
2005-10-11 313-499-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DETROITZN2 MI
2005-09-23 313-362-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J DETROITZN5 MI
2005-09-20 313-768-5XXX 5000–5999Assigned WOW! INTERNET, CABLE AND PHONE 961J DETROITZN6 MI
2005-09-15 313-293-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2005-08-24 313-406-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2005-08-24 313-406-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2005-08-02 313-769-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J DETROITZN6 MI
2005-07-14 313-416-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J DETROITZN4 MI
2005-07-14 313-499-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J DETROITZN2 MI
2005-06-21 313-293-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN1 MI
2005-06-21 313-429-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN6 MI
2005-06-21 313-429-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN6 MI
2005-06-21 313-429-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN6 MI
2005-06-20 313-221-2XXX 2000–2999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2005-06-08 313-263-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 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.