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
2020-09-16 559-209-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-319-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-319-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-319-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-344-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FOWLER CA
2020-09-16 559-421-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-570-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-08-25 559-207-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLOVIS CA
2020-08-21 559-507-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-08-21 559-507-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-08-21 559-507-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-08-21 559-507-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-08-21 559-507-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2020-08-20 559-335-0XXX 0000–0999Assigned TELNYX LLC 073H GRANTGROVE CA
2020-08-14 559-570-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-08-12 559-383-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 AVENAL CA
2020-08-12 559-420-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-08-12 559-580-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 COARSEGOLD CA
2020-08-11 559-254-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PARLIER CA
2020-08-11 559-509-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2020-08-04 559-509-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TULARE CA
2020-08-03 559-755-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KERMAN CA
2020-07-24 559-599-9XXX 9000–9999Assigned FRACTEL, LLC 965H CLOVIS CA
2020-07-23 559-209-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-07-23 559-388-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-07-23 559-388-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-07-23 559-388-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2020-07-21 559-516-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-553-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-699-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-699-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-699-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-699-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-746-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-746-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-746-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-21 559-750-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2020-07-10 559-699-9XXX 9000–9999Assigned FRACTEL, LLC 965H VISALIA CA
2020-07-10 559-955-5XXX 5000–5999Assigned FRACTEL, LLC 965H TIVYVALLEY CA
2020-07-07 559-509-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2020-06-30 559-590-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DINUBA CA
2020-06-30 559-615-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PORTERVL CA
2020-06-17 559-209-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H FRESNO CA
2020-06-17 559-209-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H FRESNO CA
2020-06-17 559-209-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H FRESNO CA
2020-06-17 559-209-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H FRESNO CA
2020-06-15 559-702-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WOODLAKE CA
2020-06-12 559-553-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2020-06-09 559-257-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SELMA CA
2020-06-09 559-383-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 AVENAL 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.