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
2009-01-14 415-400-1XXX 1000–1999Assigned RACE TELECOMMUNICATIONS, INC. - CA 973E SNFC CNTRL CA
2009-01-08 415-684-9XXX 9000–9999Assigned IP HORIZON LLC 515J SNFC CNTRL CA
2008-12-16 415-493-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NOVATO CA
2008-12-16 415-763-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E IGNACIO CA
2008-12-16 415-935-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-12-16 415-935-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-12-16 415-935-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-12-04 415-935-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2008-12-04 415-935-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2008-12-04 415-935-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2008-12-04 415-935-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2008-12-04 415-935-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2008-12-01 415-324-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SAUSALITO CA
2008-11-17 415-524-9XXX 9000–9999Assigned METROPCS, INC. 5562 SAN RAFAEL CA
2008-11-07 415-875-0XXX 0000–0999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-11-07 415-946-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-11-07 415-947-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-11-05 415-715-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC JUNPR CA
2008-10-21 415-347-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC JUNPR CA
2008-10-21 415-347-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC JUNPR CA
2008-10-21 415-347-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC JUNPR CA
2008-10-21 415-448-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN RAFAEL CA
2008-10-21 415-690-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BELVEDERE CA
2008-10-21 415-702-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2008-10-21 415-742-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2008-10-21 415-754-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2008-10-21 415-843-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MILLVALLEY CA
2008-10-21 415-886-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORTEMADRA CA
2008-10-21 415-894-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-10-21 415-894-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-10-21 415-894-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-10-21 415-894-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-10-17 415-935-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2008-10-13 415-296-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2008-10-13 415-744-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2008-10-07 415-525-0XXX 0000–0999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-10-07 415-955-7XXX 7000–7999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-10-01 415-889-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BELVEDERE CA
2008-09-24 415-755-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2008-09-17 415-525-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2008-09-12 415-671-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNFC CNTRL CA
2008-09-12 415-671-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNFC CNTRL CA
2008-08-20 415-506-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L IGNACIO CA
2008-08-18 415-887-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAUSALITO CA
2008-08-18 415-891-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CORTEMADRA CA
2008-08-13 415-702-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC MT-EV CA
2008-08-07 415-314-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2008-08-07 415-652-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2008-08-05 415-983-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2008-08-04 415-896-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L 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.