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
2012-07-24 415-583-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2012-07-17 415-463-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC MT-EV CA
2012-07-17 415-527-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2012-07-17 415-527-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SNFC CNTRL CA
2012-07-16 415-527-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2012-07-13 415-527-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2012-07-13 415-527-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2012-07-09 415-360-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MILLVALLEY CA
2012-07-09 415-580-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J SNFC CNTRL CA
2012-07-02 415-687-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-07-02 415-687-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-06-28 415-275-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAUSALITO CA
2012-06-28 415-419-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN RAFAEL CA
2012-06-28 415-419-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2012-06-28 415-527-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2012-06-28 415-527-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2012-06-28 415-527-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2012-06-28 415-527-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2012-06-27 415-528-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2012-06-26 415-729-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAUSALITO CA
2012-06-06 415-580-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2012-06-05 415-580-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2012-05-29 415-859-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2012-05-25 415-463-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC MT-EV CA
2012-05-22 415-527-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNFC CNTRL CA
2012-05-21 415-534-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STNSN-BLNS CA
2012-05-21 415-535-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-21 415-535-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-21 415-535-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-21 415-535-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-21 415-580-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2012-05-21 415-580-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNFC CNTRL CA
2012-05-21 415-580-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNFC CNTRL CA
2012-05-17 415-528-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2012-05-16 415-369-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-16 415-410-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC MT-EV CA
2012-05-16 415-470-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-16 415-470-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-16 415-470-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-16 415-470-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-16 415-603-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2012-05-16 415-603-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 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.