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
2010-12-08 415-529-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2010-12-07 415-529-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2010-12-07 415-797-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BELVEDERE CA
2010-12-03 415-484-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2010-12-03 415-484-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2010-11-30 415-233-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2010-11-30 415-813-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2010-11-30 415-813-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2010-11-23 415-500-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-500-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-500-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-500-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-500-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-500-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-795-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-795-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-795-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-795-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-23 415-795-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2010-11-23 415-813-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2010-11-23 415-813-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2010-11-23 415-813-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2010-11-23 415-900-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C BELVEDERE CA
2010-11-19 415-465-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SAUSALITO CA
2010-11-19 415-639-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C INVERNESS CA
2010-11-18 415-500-6XXX 6000–6999Assigned IP HORIZON LLC 515J SNFC CNTRL CA
2010-11-18 415-888-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C MILLVALLEY CA
2010-11-18 415-888-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C MILLVALLEY CA
2010-11-18 415-888-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C MILLVALLEY CA
2010-11-16 415-496-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORTEMADRA CA
2010-11-16 415-598-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NICASIO CA
2010-11-16 415-663-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POINTREYES CA
2010-11-16 415-689-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2010-11-16 415-690-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BELVEDERE CA
2010-11-16 415-895-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NOVATO CA
2010-11-16 415-895-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NOVATO CA
2010-11-12 415-475-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E IGNACIO CA
2010-11-12 415-766-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2010-11-12 415-766-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2010-11-12 415-766-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-12 415-766-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2010-11-12 415-944-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2010-11-08 415-349-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC JUNPR CA
2010-11-04 415-529-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2010-11-04 415-529-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2010-11-03 415-888-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C MILLVALLEY CA
2010-10-29 415-789-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BELVEDERE CA
2010-10-27 415-347-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2010-10-27 415-408-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NOVATO CA
2010-10-18 415-766-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E 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.