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
2006-11-21 415-859-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC JUNPR CA
2006-11-21 415-859-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC JUNPR CA
2006-11-16 415-658-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-658-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-692-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-814-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-814-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-814-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-830-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-830-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-830-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-830-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-830-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-16 415-830-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-11-13 415-682-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC MT-EV CA
2006-11-02 415-774-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2006-10-30 415-404-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2006-10-27 415-963-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-10-25 415-827-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 NOVATO CA
2006-10-24 415-848-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2006-10-24 415-848-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2006-10-23 415-912-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-10-20 415-295-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN RAFAEL CA
2006-10-20 415-524-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN RAFAEL CA
2006-10-19 415-758-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CORTEMADRA CA
2006-10-10 415-209-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NOVATO CA
2006-10-09 415-422-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNFC MT-EV CA
2006-10-06 415-742-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC MT-EV CA
2006-09-29 415-829-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2006-09-29 415-829-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2006-09-29 415-829-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2006-09-29 415-829-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2006-09-28 415-728-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2006-09-26 415-663-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C POINTREYES CA
2006-09-26 415-829-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-09-26 415-829-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-09-21 415-704-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SNFC JUNPR CA
2006-09-17 415-738-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2006-09-14 415-614-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-09-14 415-683-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC MT-EV CA
2006-09-14 415-755-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2006-09-14 415-814-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-09-14 415-814-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-09-14 415-814-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-09-05 415-814-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2006-08-28 415-493-9XXX 9000–9999Assigned TWILIO INTERNATIONAL, INC. 506J NOVATO CA
2006-08-18 415-827-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 NOVATO CA
2006-08-18 415-827-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 NOVATO CA
2006-08-11 415-692-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-08-06 415-335-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR 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.