NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

22 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 559
NEW CINGULAR WIRELESS PCS, LLC 4
HD CARRIER LLC 4
EXIANT COMMUNICATIONS LLC 4
BANDWIDTH.COM CLEC, LLC - CA 4
OPENTACT INC. 2
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
2013-08-19 559-400-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2013-08-16 559-210-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SANJOAQUIN CA
2013-08-16 559-900-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2013-08-13 559-400-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FRESNO CA
2013-08-09 559-203-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLOVIS CA
2013-08-09 559-536-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MADERA CA
2013-08-09 559-660-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2013-08-06 559-480-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 REEDLEY CA
2013-08-05 559-385-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2013-08-02 559-536-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MADERA CA
2013-07-31 559-468-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J WOODLAKE CA
2013-07-31 559-666-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2013-07-31 559-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2013-07-31 559-666-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2013-07-31 559-666-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2013-07-25 559-203-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLOVIS CA
2013-07-18 559-372-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2013-07-10 559-544-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PORTERVL CA
2013-07-10 559-751-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ALPAUGH CA
2013-07-08 559-385-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRESNO CA
2013-07-08 559-385-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRESNO CA
2013-07-08 559-385-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRESNO CA
2013-07-08 559-385-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRESNO CA
2013-07-08 559-385-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRESNO CA
2013-07-08 559-747-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2013-07-08 559-747-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2013-07-02 559-391-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 REEDLEY CA
2013-07-02 559-391-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 REEDLEY CA
2013-07-02 559-391-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 REEDLEY CA
2013-06-27 559-385-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRESNO CA
2013-06-26 559-998-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LEMOORE CA
2013-06-18 559-302-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J VISALIA CA
2013-06-18 559-500-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2013-06-18 559-777-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J FRESNO CA
2013-06-10 559-369-0XXX 0000–0999Assigned METROPCS, INC. 5562 FRESNO CA
2013-06-10 559-442-9XXX 9000–9999Assigned METROPCS, INC. 5562 FRESNO CA
2013-06-10 559-549-1XXX 1000–1999Assigned METROPCS, INC. 5562 FRESNO CA
2013-06-10 559-777-3XXX 3000–3999Assigned METROPCS, INC. 5562 FRESNO CA
2013-06-07 559-374-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRESNO CA
2013-06-05 559-900-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2013-05-31 559-363-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2013-05-21 559-329-6XXX 6000–6999Assigned METROPCS, INC. 5562 TULARE CA
2013-05-21 559-350-6XXX 6000–6999Assigned METROPCS, INC. 5562 PORTERVL CA
2013-05-21 559-358-8XXX 8000–8999Assigned METROPCS, INC. 5562 TULARE CA
2013-05-21 559-546-2XXX 2000–2999Assigned METROPCS, INC. 5562 SANGER CA
2013-05-21 559-546-3XXX 3000–3999Assigned METROPCS, INC. 5562 SANGER CA
2013-05-21 559-596-4XXX 4000–4999Assigned METROPCS, INC. 5562 DINUBA CA
2013-05-21 559-645-9XXX 9000–9999Assigned METROPCS, INC. 5562 MADERA CA
2013-05-21 559-852-9XXX 9000–9999Assigned METROPCS, INC. 5562 HANFORD CA
2013-05-17 559-369-3XXX 3000–3999Assigned METROPCS, INC. 5562 FRESNO 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.