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
2008-08-04 415-932-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2008-07-30 415-612-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C IGNACIO CA
2008-07-24 415-618-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-07-21 415-329-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CORTEMADRA CA
2008-07-21 415-729-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SAUSALITO CA
2008-07-21 415-797-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BELVEDERE CA
2008-07-21 415-895-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C NOVATO CA
2008-07-09 415-544-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2008-07-09 415-932-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2008-07-08 415-494-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2008-07-01 415-666-5XXX 5000–5999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2008-06-25 415-261-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2008-06-25 415-261-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2008-06-24 415-323-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 NICASIO CA
2008-06-24 415-886-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CORTEMADRA CA
2008-06-23 415-779-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 STNSN-BLNS CA
2008-06-23 415-842-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 IGNACIO CA
2008-06-23 415-878-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 NOVATO CA
2008-06-23 415-944-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SAUSALITO CA
2008-06-23 415-968-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MILLVALLEY CA
2008-06-23 415-997-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 NICASIO CA
2008-06-10 415-702-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2008-06-09 415-532-9XXX 9000–9999Assigned METROPCS, INC. 5562 SAN RAFAEL CA
2008-06-09 415-685-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2008-06-04 415-450-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2008-05-23 415-480-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUSALITO CA
2008-05-23 415-817-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2008-05-23 415-913-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2008-05-21 415-685-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2008-05-21 415-742-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2008-05-21 415-742-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2008-05-20 415-255-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2008-05-20 415-418-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC MT-EV CA
2008-05-14 415-935-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2008-05-07 415-390-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 POINTREYES CA
2008-05-07 415-524-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2008-05-06 415-484-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 STNSN-BLNS CA
2008-05-01 415-409-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2008-05-01 415-409-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2008-04-28 415-263-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2008-04-28 415-684-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2008-04-24 415-419-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2008-04-24 415-419-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2008-04-18 415-475-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 IGNACIO CA
2008-04-16 415-230-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2008-04-15 415-729-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAUSALITO CA
2008-04-14 415-524-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN RAFAEL CA
2008-04-14 415-895-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L NOVATO CA
2008-04-04 415-230-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2008-04-04 415-230-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J 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.