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
2013-02-15 559-644-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C CARUTHERS CA
2013-02-14 559-369-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRESNO CA
2013-02-12 559-472-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CLOVIS CA
2013-02-11 559-374-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2013-01-31 559-823-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ORANGECOVE CA
2013-01-29 559-369-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2013-01-29 559-369-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2013-01-29 559-479-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MADERA CA
2013-01-28 559-544-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PORTERVL CA
2013-01-14 559-366-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C TULARE CA
2013-01-14 559-399-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SANGER CA
2013-01-14 559-715-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CHOWCHILLA CA
2013-01-14 559-725-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C DINUBA CA
2013-01-10 559-573-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2012-12-21 559-467-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2012-12-21 559-481-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2012-12-14 559-317-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRESNO CA
2012-12-05 559-201-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C CHOWCHILLA CA
2012-12-05 559-223-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C CHOWCHILLA CA
2012-12-05 559-223-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CHOWCHILLA CA
2012-12-05 559-295-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COALINGA CA
2012-11-30 559-343-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STRATFORD CA
2012-11-30 559-461-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SEQUOIA CA
2012-11-30 559-466-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TIPTON CA
2012-11-29 559-228-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2012-11-29 559-426-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PARLIER CA
2012-11-29 559-428-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERDALE CA
2012-11-29 559-821-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E COALINGA CA
2012-11-26 559-900-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CLOVIS CA
2012-11-19 559-573-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2012-11-16 559-517-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MADERA CA
2012-11-13 559-500-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2012-11-13 559-666-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2012-10-31 559-869-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KINGSBURG CA
2012-10-30 559-212-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HANFORD CA
2012-10-30 559-258-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DEL REY CA
2012-10-16 559-267-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RAYMOND CA
2012-10-16 559-817-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 LEMOORE CA
2012-10-08 559-909-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VISALIA CA
2012-10-01 559-369-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2012-10-01 559-618-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TIVYVALLEY CA
2012-09-27 559-749-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VISALIA CA
2012-09-27 559-975-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MADERA CA
2012-09-26 559-829-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANJOAQUIN CA
2012-09-20 559-500-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRESNO CA
2012-09-19 559-500-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2012-09-19 559-500-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2012-09-19 559-500-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2012-09-19 559-500-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRESNO CA
2012-09-19 559-500-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E 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.