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
2011-03-16 415-534-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 STNSN-BLNS CA
2011-03-16 415-630-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NICASIO CA
2011-03-16 415-723-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 POINTREYES CA
2011-03-15 415-729-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUSALITO CA
2011-03-14 415-799-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2011-03-14 415-799-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2011-03-09 415-900-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BELVEDERE CA
2011-02-25 415-745-4XXX 4000–4999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2011-02-25 415-745-6XXX 6000–6999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2011-02-24 415-852-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2011-02-24 415-895-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L NOVATO CA
2011-02-23 415-656-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2011-02-23 415-745-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SNFC MT-EV CA
2011-02-17 415-341-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2011-02-16 415-852-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2011-02-16 415-852-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2011-02-10 415-852-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-02-10 415-852-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-02-10 415-852-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-02-10 415-895-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 NOVATO CA
2011-02-07 415-755-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2011-01-31 415-728-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2011-01-31 415-813-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2011-01-28 415-529-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-28 415-813-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-28 415-813-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-28 415-813-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-28 415-813-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-28 415-815-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-28 415-815-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2011-01-27 415-879-7XXX 7000–7999Assigned METROPCS, INC. 5562 MILLVALLEY CA
2011-01-26 415-815-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2011-01-20 415-326-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MILLVALLEY CA
2011-01-20 415-483-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E IGNACIO CA
2011-01-20 415-529-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2011-01-20 415-689-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2011-01-11 415-529-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2011-01-11 415-745-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC MT-EV CA
2011-01-10 415-213-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2011-01-10 415-944-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2011-01-07 415-798-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NOVATO CA
2011-01-06 415-213-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC MT-EV CA
2010-12-29 415-404-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2010-12-17 415-529-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2010-12-17 415-529-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2010-12-13 415-508-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC JUNPR CA
2010-12-10 415-689-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2010-12-10 415-704-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2010-12-08 415-430-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2010-12-08 415-529-1XXX 1000–1999Assigned 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.