NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

21 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
2020-06-09 559-423-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LEMOORE CA
2020-06-09 559-428-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERDALE CA
2020-06-09 559-509-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2020-05-28 559-516-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-28 559-516-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-05-26 559-531-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TIVYVALLEY CA
2020-05-13 559-710-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H FRESNO CA
2020-05-13 559-710-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H FRESNO CA
2020-04-21 559-209-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-446-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-446-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-499-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-499-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-981-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-981-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-981-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-981-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-21 559-981-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-04-15 559-507-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MADERA CA
2020-04-15 559-701-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CLOVIS CA
2020-04-10 559-608-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 VISALIA CA
2020-04-07 559-245-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MIRANTPHST CA
2020-04-07 559-245-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C MIRANTPHST CA
2020-04-07 559-507-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-04-03 559-395-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-04-03 559-601-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CARUTHERS CA
2020-04-03 559-645-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-04-01 559-590-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DINUBA CA
2020-04-01 559-624-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VISALIA CA
2020-04-01 559-749-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VISALIA CA
2020-03-26 559-527-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TERRABELLA CA
2020-03-25 559-509-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2020-03-24 559-570-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-03-09 559-710-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRESNO CA
2020-03-09 559-729-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 AVENAL CA
2020-03-03 559-570-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-03-03 559-890-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRESNO CA
2020-02-28 559-395-8XXX 8000–8999Assigned METROPCS, INC. 5562 MADERA CA
2020-02-28 559-395-9XXX 9000–9999Assigned METROPCS, INC. 5562 MADERA CA
2020-02-28 559-615-8XXX 8000–8999Assigned METROPCS, INC. 5562 PORTERVL CA
2020-02-28 559-615-9XXX 9000–9999Assigned METROPCS, INC. 5562 PORTERVL CA
2020-02-28 559-710-3XXX 3000–3999Assigned METROPCS, INC. 5562 FRESNO CA
2020-02-28 559-710-4XXX 4000–4999Assigned 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.