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
2004-11-09 415-404-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2004-11-02 415-367-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAUSALITO CA
2004-10-05 415-946-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2004-10-05 415-946-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2004-10-05 415-946-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2004-09-23 415-283-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-09-16 415-508-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2004-09-14 415-335-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2004-09-14 415-686-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2004-09-14 415-686-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2004-09-14 415-702-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2004-08-31 415-295-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN RAFAEL CA
2004-08-25 415-226-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN RAFAEL CA
2004-08-06 415-299-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SAN RAFAEL CA
2004-07-29 415-300-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2004-07-29 415-300-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2004-07-06 415-283-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-07-06 415-283-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-07-06 415-283-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-07-06 415-283-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-07-02 415-692-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2004-06-21 415-410-4XXX 4000–4999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2004-06-21 415-410-5XXX 5000–5999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2004-06-21 415-410-6XXX 6000–6999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2004-06-21 415-410-7XXX 7000–7999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2004-06-21 415-410-8XXX 8000–8999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2004-06-16 415-216-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-06-16 415-216-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-06-16 415-217-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-06-16 415-318-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-05-21 415-568-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-05-17 415-318-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-05-12 415-315-0XXX 0000–0999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC CNTRL CA
2004-04-28 415-568-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-04-26 415-328-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NOVATO CA
2004-04-16 415-568-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-04-16 415-568-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2004-04-08 415-570-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNFC JUNPR CA
2004-03-29 415-299-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SAN RAFAEL CA
2004-03-25 415-374-1XXX 1000–1999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-374-3XXX 3000–3999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-374-4XXX 4000–4999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-374-5XXX 5000–5999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-374-6XXX 6000–6999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-678-0XXX 0000–0999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-678-6XXX 6000–6999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-678-7XXX 7000–7999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-678-8XXX 8000–8999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-25 415-678-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNFC CNTRL CA
2004-03-24 415-651-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 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.