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
2018-09-26 313-351-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN3 MI
2018-09-25 313-306-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-09-25 313-306-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-09-25 313-306-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-09-25 313-306-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-09-21 313-257-0XXX 0000–0999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-1XXX 1000–1999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-8XXX 8000–8999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-257-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2018-09-21 313-771-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-09-20 313-462-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-09-19 313-356-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2018-09-19 313-356-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2018-09-19 313-364-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-09-19 313-765-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2018-09-19 313-765-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2018-09-19 313-765-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2018-09-19 313-765-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2018-09-19 313-765-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2018-09-18 313-922-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2018-09-17 313-856-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2018-09-17 313-856-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2018-09-17 313-856-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2018-09-17 313-856-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2018-09-17 313-856-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2018-09-11 313-856-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-09-04 313-816-1XXX 1000–1999Assigned AIRUS, INC. - MI 948H DETROITZN1 MI
2018-08-24 313-725-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-08-24 313-725-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-08-23 313-356-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2018-08-22 313-364-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2018-08-20 313-771-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DETROITZN1 MI
2018-08-17 313-356-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2018-08-17 313-422-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2018-08-15 313-462-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-08-15 313-462-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2018-07-23 313-856-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-07-11 313-217-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2018-07-10 313-364-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2018-07-10 313-364-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2018-07-10 313-364-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2018-07-10 313-364-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2018-07-10 313-364-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2018-07-10 313-364-7XXX 7000–7999Assigned METROPCS, INC. 5562 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.