NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

13 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 831
ONVOY, LLC - CA 10
EXIANT COMMUNICATIONS LLC 2
BANDWIDTH.COM CLEC, LLC - CA 1
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
2016-03-18 831-322-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2016-03-08 831-346-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-03-08 831-346-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-03-08 831-425-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-03-08 831-888-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-03-07 831-222-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FELTON CA
2016-03-07 831-508-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FELTON CA
2016-03-02 831-225-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2016-03-02 831-225-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2016-03-02 831-225-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2016-02-23 831-800-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALINAS CA
2016-02-22 831-627-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN ARDO CA
2016-02-16 831-315-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SOLEDAD CA
2016-02-16 831-888-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-02-16 831-888-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-02-16 831-888-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2016-02-12 831-534-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FELTON CA
2016-02-12 831-534-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FELTON CA
2016-02-12 831-610-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C BOULDERCRK CA
2016-02-12 831-610-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C BOULDERCRK CA
2016-02-12 831-709-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C BEN LOMOND CA
2016-02-12 831-709-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BEN LOMOND CA
2016-02-10 831-221-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAN ARDO CA
2016-02-10 831-232-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CHUALAR CA
2016-02-10 831-250-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CARMEL CA
2016-02-10 831-263-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F KING CITY CA
2016-02-10 831-267-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BIG SUR CA
2016-02-10 831-298-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CARMEL VLY CA
2016-02-10 831-586-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAN JUAN CA
2016-02-10 831-613-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F GREENFIELD CA
2016-02-10 831-741-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CASTROVL CA
2016-02-10 831-744-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F GONZALES CA
2016-02-10 831-778-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAN LUCAS CA
2016-02-10 831-921-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F TRES PINOS CA
2016-02-09 831-228-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WATSONVL CA
2016-02-05 831-217-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C BOULDERCRK CA
2016-02-05 831-217-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BOULDERCRK CA
2016-01-29 831-228-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2016-01-29 831-228-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2016-01-29 831-278-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BEN LOMOND CA
2016-01-29 831-888-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2016-01-27 831-709-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C BEN LOMOND CA
2016-01-27 831-709-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C BEN LOMOND CA
2016-01-26 831-228-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2016-01-26 831-228-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2016-01-25 831-612-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C APTOS CA
2016-01-25 831-708-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C APTOS CA
2016-01-22 831-888-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SANTA CRUZ CA
2016-01-22 831-888-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SANTA CRUZ CA
2016-01-07 831-612-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C APTOS 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.