NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2003-11-21 408-876-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2003-11-21 408-876-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2003-11-20 408-416-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS NORTH CA
2003-11-13 408-761-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2003-10-23 408-357-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LOS GATOS CA
2003-10-20 408-580-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2003-10-20 408-580-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2003-10-10 408-528-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2003-10-10 408-528-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2003-09-26 408-317-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LOS GATOS CA
2003-09-19 408-429-1XXX 1000–1999Assigned IP HORIZON LLC 515J CAMPBELL CA
2003-09-19 408-429-2XXX 2000–2999Assigned IP HORIZON LLC 515J CAMPBELL CA
2003-09-19 408-582-6XXX 6000–6999Assigned IP HORIZON LLC 515J SNJS NORTH CA
2003-09-19 408-582-7XXX 7000–7999Assigned IP HORIZON LLC 515J SNJS NORTH CA
2003-09-17 408-513-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2003-09-17 408-513-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2003-09-16 408-228-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS NORTH CA
2003-09-02 408-687-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2003-09-02 408-687-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2003-09-02 408-687-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2003-09-02 408-914-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2003-09-02 408-914-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2003-09-02 408-914-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2003-08-22 408-461-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SAN MARTIN CA
2003-08-15 408-761-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2003-08-15 408-761-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2003-08-05 408-335-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOS GATOS CA
2003-07-16 408-608-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2003-07-16 408-608-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2003-07-10 408-833-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2003-07-10 408-833-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2003-07-10 408-834-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS NORTH CA
2003-07-10 408-834-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS NORTH CA
2003-07-10 408-834-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS NORTH CA
2003-07-10 408-834-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS NORTH CA
2003-07-01 408-603-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2003-06-20 408-385-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2003-06-13 408-416-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2003-06-13 408-416-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2003-06-13 408-416-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2003-05-28 408-340-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 CAMPBELL CA
2003-05-28 408-438-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOS GATOS CA
2003-05-28 408-825-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MORGANHILL CA
2003-05-20 408-761-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2003-05-05 408-449-0XXX 0000–0999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2003-05-05 408-449-1XXX 1000–1999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2003-05-05 408-449-2XXX 2000–2999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2003-05-05 408-449-3XXX 3000–3999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2003-05-05 408-449-8XXX 8000–8999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2003-05-05 408-449-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNJS NORTH CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.