NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 415
BOOST SUBSCRIBERCO L.L.C. 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
2005-03-06 415-513-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2005-02-25 415-342-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2005-02-25 415-342-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2005-02-22 415-632-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2005-02-18 415-508-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2005-02-18 415-508-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2005-02-18 415-578-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2005-02-18 415-578-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2005-02-17 415-322-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C MILLVALLEY CA
2005-02-17 415-704-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SNFC JUNPR CA
2005-02-16 415-373-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-16 415-373-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-16 415-373-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-16 415-374-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-16 415-490-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-16 415-503-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-16 415-503-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2005-02-09 415-259-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2005-02-09 415-259-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2005-02-09 415-259-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2005-02-09 415-494-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC JUNPR CA
2005-02-08 415-209-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NOVATO CA
2005-02-04 415-692-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2005-02-04 415-692-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2005-02-01 415-691-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BELVEDERE CA
2005-01-21 415-630-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NICASIO CA
2005-01-13 415-692-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2004-12-29 415-877-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MILLVALLEY CA
2004-12-28 415-413-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORTEMADRA CA
2004-12-28 415-504-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2004-12-28 415-504-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2004-12-28 415-599-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NOVATO CA
2004-12-14 415-573-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2004-12-10 415-237-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INVERNESS CA
2004-12-10 415-683-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2004-12-09 415-570-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2004-11-23 415-367-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUSALITO CA
2004-11-19 415-375-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC MT-EV CA
2004-11-12 415-321-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-321-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-351-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-351-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-374-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-395-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-401-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-430-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-430-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-430-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-438-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-11-12 415-489-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA

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.