NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 408
BANDWIDTH.COM CLEC, LLC - CA 411
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 287
LEVEL 3 COMMUNICATIONS, LLC - CA 262
NEW CINGULAR WIRELESS PCS, LLC 243
T-MOBILE USA, INC. 230
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
2011-03-16 408-868-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2011-03-09 408-791-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2011-03-08 408-455-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LOS GATOS CA
2011-03-02 408-900-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SUNNYVALE CA
2011-02-28 408-352-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J SNJS WEST CA
2011-02-25 408-679-6XXX 6000–6999Assigned METROPCS, INC. 5562 CAMPBELL CA
2011-02-25 408-766-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNJS SOUTH CA
2011-02-25 408-766-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNJS SOUTH CA
2011-02-25 408-791-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C SNJS NORTH CA
2011-02-17 408-791-4XXX 4000–4999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2011-02-17 408-791-5XXX 5000–5999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2011-02-08 408-201-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORGANHILL CA
2011-01-31 408-532-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2011-01-26 408-680-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2011-01-25 408-658-2XXX 2000–2999Assigned METROPCS, INC. 5562 SNJS WEST CA
2011-01-25 408-658-3XXX 3000–3999Assigned METROPCS, INC. 5562 SNJS WEST CA
2011-01-25 408-658-4XXX 4000–4999Assigned METROPCS, INC. 5562 SNJS WEST CA
2011-01-25 408-658-5XXX 5000–5999Assigned METROPCS, INC. 5562 SNJS WEST CA
2011-01-25 408-658-7XXX 7000–7999Assigned METROPCS, INC. 5562 SNJS WEST CA
2011-01-20 408-359-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SARATOGA CA
2011-01-20 408-659-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MORGANHILL CA
2011-01-20 408-663-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNNYVALE CA
2011-01-18 408-353-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOS GATOS CA
2011-01-18 408-579-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SNJS WEST CA
2011-01-14 408-484-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SARATOGA CA
2011-01-11 408-419-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SUNNYVALE CA
2011-01-11 408-692-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SAN MARTIN CA
2011-01-07 408-335-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LOS GATOS CA
2011-01-04 408-658-1XXX 1000–1999Assigned PACIFIC BELL 9740 SNJS WEST CA
2011-01-04 408-791-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SNJS NORTH CA
2010-12-23 408-791-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2010-12-22 408-412-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CAMPBELL CA
2010-12-17 408-637-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2010-12-17 408-663-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNNYVALE CA
2010-12-13 408-645-8XXX 8000–8999Assigned METROPCS, INC. 5562 SNJS WEST CA
2010-12-13 408-645-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNJS WEST CA
2010-12-10 408-645-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2010-12-10 408-645-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2010-12-10 408-724-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS SOUTH CA
2010-12-10 408-800-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS SOUTH CA
2010-12-07 408-645-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SNJS WEST CA
2010-12-07 408-645-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNJS WEST CA
2010-12-06 408-340-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CAMPBELL CA
2010-12-03 408-645-1XXX 1000–1999Assigned METROPCS, INC. 5562 SNJS WEST CA
2010-12-02 408-385-2XXX 2000–2999Assigned IP HORIZON LLC 515J CAMPBELL CA
2010-11-22 408-800-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNJS SOUTH CA
2010-11-22 408-800-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNJS SOUTH CA
2010-11-22 408-800-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNJS SOUTH CA
2010-11-19 408-514-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2010-11-16 408-663-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUNNYVALE 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.