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
2014-07-14 415-872-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2014-07-10 415-872-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-07-10 415-872-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-07-09 415-872-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C SNFC CNTRL CA
2014-07-08 415-991-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2014-07-02 415-988-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2014-06-26 415-969-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-26 415-969-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-24 415-941-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC MT-EV CA
2014-06-23 415-942-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2014-06-23 415-942-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2014-06-19 415-289-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2014-06-19 415-660-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2014-06-19 415-941-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2014-06-19 415-941-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2014-06-19 415-941-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2014-06-19 415-941-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2014-06-19 415-941-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC MT-EV CA
2014-06-18 415-769-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2014-06-18 415-769-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2014-06-18 415-870-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN RAFAEL CA
2014-06-17 415-729-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAUSALITO CA
2014-06-17 415-872-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2014-06-17 415-872-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2014-06-17 415-872-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2014-06-11 415-941-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC MT-EV CA
2014-06-10 415-484-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2014-06-10 415-496-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORTEMADRA CA
2014-06-10 415-723-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POINTREYES CA
2014-06-10 415-723-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POINTREYES CA
2014-06-10 415-723-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POINTREYES CA
2014-06-10 415-737-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORTEMADRA CA
2014-06-10 415-862-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2014-06-10 415-862-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2014-06-10 415-868-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2014-06-10 415-870-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN RAFAEL CA
2014-06-10 415-870-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN RAFAEL CA
2014-06-10 415-870-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN RAFAEL CA
2014-06-10 415-886-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORTEMADRA CA
2014-06-02 415-275-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SAUSALITO CA
2014-06-02 415-842-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 IGNACIO CA
2014-06-02 415-872-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNFC CNTRL CA
2014-06-02 415-941-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2014-06-02 415-969-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-02 415-969-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-02 415-969-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-02 415-969-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-02 415-969-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-06-02 415-969-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2014-05-30 415-870-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL 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.