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
2017-02-23 559-465-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E THREERIVRS CA
2017-02-15 559-293-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-15 559-293-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-15 559-293-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-15 559-293-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-15 559-293-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-09 559-612-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-02-07 559-409-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2017-01-30 559-343-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E STRATFORD CA
2017-01-27 559-407-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FIREBAUGH CA
2017-01-11 559-542-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SPRINGVL CA
2017-01-11 559-744-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SPRINGVL CA
2017-01-11 559-837-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2017-01-09 559-290-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-01-09 559-290-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-01-09 559-290-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-01-09 559-290-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-01-09 559-290-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2017-01-09 559-290-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-12-21 559-290-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2016-12-21 559-290-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRESNO CA
2016-12-20 559-837-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2016-12-16 559-409-1XXX 1000–1999Assigned TELNYX LLC 073H VISALIA CA
2016-12-14 559-290-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2016-12-07 559-690-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2016-12-07 559-931-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2016-12-06 559-290-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-12-06 559-780-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CORCORAN CA
2016-11-28 559-207-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CLOVIS CA
2016-11-28 559-371-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-28 559-653-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FOWLER CA
2016-11-28 559-785-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-28 559-832-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-28 559-832-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-22 559-608-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C VISALIA CA
2016-11-22 559-608-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C VISALIA CA
2016-11-21 559-462-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SPRINGVL CA
2016-11-16 559-207-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLOVIS CA
2016-11-16 559-207-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLOVIS CA
2016-11-16 559-207-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLOVIS CA
2016-11-14 559-340-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DUNLAP CA
2016-11-14 559-594-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 EXETER CA
2016-11-14 559-775-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CHOWCHILLA CA
2016-11-10 559-654-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SEQUOIA CA
2016-11-08 559-216-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-08 559-216-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-08 559-216-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-08 559-216-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-08 559-216-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-11-08 559-216-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 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.