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
2014-01-09 313-502-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DETROITZN1 MI
2013-12-13 313-264-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J DETROITZN2 MI
2013-12-06 313-349-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2013-12-06 313-349-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2013-12-06 313-723-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2013-12-06 313-723-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2013-12-06 313-723-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2013-12-02 313-254-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DETROITZN6 MI
2013-12-02 313-502-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2013-12-02 313-502-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2013-12-02 313-502-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2013-11-26 313-264-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2013-11-26 313-264-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2013-11-26 313-264-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2013-11-26 313-264-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2013-11-26 313-264-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN2 MI
2013-11-26 313-307-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2013-11-26 313-307-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN4 MI
2013-11-26 313-327-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2013-11-26 313-327-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2013-11-26 313-327-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN3 MI
2013-11-25 313-265-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2013-11-25 313-265-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2013-11-25 313-265-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN1 MI
2013-11-08 313-246-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DETROITZN5 MI
2013-11-04 313-327-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2013-11-01 313-425-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2013-11-01 313-425-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN6 MI
2013-10-24 313-545-0XXX 0000–0999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-1XXX 1000–1999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-2XXX 2000–2999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-3XXX 3000–3999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-4XXX 4000–4999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-5XXX 5000–5999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-6XXX 6000–6999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-7XXX 7000–7999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-8XXX 8000–8999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-24 313-545-9XXX 9000–9999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2013-10-15 313-264-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN2 MI
2013-10-15 313-265-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J DETROITZN1 MI
2013-09-27 313-264-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN2 MI
2013-09-27 313-307-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN4 MI
2013-09-27 313-327-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN3 MI
2013-09-27 313-930-6XXX 6000–6999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN5 MI
2013-09-27 313-995-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN6 MI
2013-09-19 313-307-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2013-09-19 313-307-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2013-09-16 313-367-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2013-09-16 313-367-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2013-09-16 313-367-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C 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.