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
2018-03-02 559-528-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DINUBA CA
2018-03-02 559-898-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SELMA CA
2018-02-28 559-653-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FOWLER CA
2018-02-28 559-823-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 ORANGECOVE CA
2018-02-23 559-729-1XXX 1000–1999Assigned EXIANT COMMUNICATIONS LLC 114J AVENAL CA
2017-12-14 559-890-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D FRESNO CA
2017-12-08 559-755-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KERMAN CA
2017-12-07 559-770-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLOVIS CA
2017-12-07 559-961-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 COALINGA CA
2017-11-28 559-705-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2017-11-06 559-550-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRESNO CA
2017-10-30 559-529-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C TIPTON CA
2017-10-04 559-701-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 CLOVIS CA
2017-09-25 559-991-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2017-09-25 559-991-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2017-09-22 559-207-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLOVIS CA
2017-09-22 559-257-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SELMA CA
2017-09-22 559-769-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WOODLAKE CA
2017-08-31 559-386-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K AVENAL CA
2017-08-22 559-550-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-22 559-550-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-22 559-550-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-22 559-550-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-22 559-550-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-22 559-550-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-22 559-550-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-08-18 559-405-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DEL REY CA
2017-08-17 559-239-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K LINDSAY CA
2017-08-17 559-409-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K VISALIA CA
2017-08-17 559-594-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K EXETER CA
2017-08-14 559-527-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J TERRABELLA CA
2017-08-08 559-483-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SPRINGVL CA
2017-08-08 559-483-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SPRINGVL CA
2017-07-25 559-401-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 AVENAL CA
2017-07-25 559-538-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2017-07-05 559-254-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PARLIER CA
2017-06-29 559-931-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F VISALIA CA
2017-06-23 559-376-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TERRABELLA CA
2017-06-13 559-705-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRESNO CA
2017-05-16 559-409-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C VISALIA CA
2017-05-16 559-701-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C CLOVIS CA
2017-05-16 559-705-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C FRESNO CA
2017-05-16 559-831-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MADERA CA
2017-05-02 559-463-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STRATFORD CA
2017-04-26 559-407-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FIREBAUGH CA
2017-04-26 559-574-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PARLIER CA
2017-04-17 559-336-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C MIRANTPHST CA
2017-04-17 559-551-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C REEDLEY CA
2017-04-11 559-332-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SQUAW VLY CA
2017-04-11 559-335-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C GRANTGROVE 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.