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
2011-08-05 559-366-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TULARE CA
2011-08-05 559-517-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MADERA CA
2011-08-02 559-376-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TERRABELLA CA
2011-07-26 559-463-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C STRATFORD CA
2011-07-26 559-682-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CARUTHERS CA
2011-07-21 559-713-8XXX 8000–8999Assigned METROPCS, INC. 5562 VISALIA CA
2011-07-20 559-403-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CARUTHERS CA
2011-07-19 559-494-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2011-07-15 559-480-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 REEDLEY CA
2011-07-13 559-203-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CLOVIS CA
2011-06-29 559-554-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRESNO CA
2011-06-27 559-554-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2011-06-27 559-554-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2011-06-24 559-406-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DINUBA CA
2011-06-24 559-406-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DINUBA CA
2011-06-16 559-684-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 TULARE CA
2011-06-07 559-370-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E THREERIVRS CA
2011-06-07 559-382-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MENDOTA CA
2011-05-26 559-203-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CLOVIS CA
2011-05-26 559-296-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FIREBAUGH CA
2011-05-26 559-306-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PORTERVL CA
2011-05-26 559-343-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STRATFORD CA
2011-05-26 559-366-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TULARE CA
2011-05-26 559-376-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TERRABELLA CA
2011-05-26 559-460-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SELMA CA
2011-05-26 559-481-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MADERA CA
2011-05-26 559-537-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HANFORD CA
2011-05-26 559-852-2XXX 2000–2999Assigned PACIFIC BELL 9740 HANFORD CA
2011-05-26 559-852-4XXX 4000–4999Assigned PACIFIC BELL 9740 HANFORD CA
2011-05-25 559-320-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2011-05-25 559-498-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2011-05-25 559-517-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MADERA CA
2011-05-25 559-840-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2011-05-25 559-981-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2011-05-24 559-203-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLOVIS CA
2011-05-18 559-372-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E VISALIA CA
2011-05-18 559-429-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E VISALIA CA
2011-05-18 559-756-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PORTERVL CA
2011-05-10 559-997-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LEMOORE CA
2011-05-09 559-670-1XXX 1000–1999Assigned WIDE VOICE, LLC - CA 252F HANFORD CA
2011-05-06 559-331-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TULARE CA
2011-05-06 559-537-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HANFORD CA
2011-05-06 559-909-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VISALIA CA
2011-05-05 559-348-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J FRESNO CA
2011-04-27 559-415-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HANFORD CA
2011-04-26 559-529-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TIPTON CA
2011-04-26 559-840-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2011-04-22 559-762-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORCORAN CA
2011-04-21 559-570-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C FRESNO CA
2011-04-14 559-402-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BURREL 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.