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
2021-03-19 831-230-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-03-19 831-230-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-03-19 831-230-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-03-18 831-666-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WATSONVL CA
2021-03-18 831-677-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOLEDAD CA
2021-03-17 831-884-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEREY CA
2021-03-17 831-884-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEREY CA
2021-03-15 831-243-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2021-03-15 831-243-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2021-03-01 831-529-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SANTA CRUZ CA
2021-03-01 831-529-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SANTA CRUZ CA
2021-03-01 831-529-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SANTA CRUZ CA
2021-03-01 831-889-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SANTA CRUZ CA
2021-03-01 831-889-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SANTA CRUZ CA
2021-02-22 831-274-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 WATSONVL CA
2021-02-22 831-348-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 WATSONVL CA
2021-02-22 831-830-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F KING CITY CA
2021-02-18 831-297-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HOLLISTER CA
2021-02-18 831-529-0XXX 0000–0999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2021-02-11 831-718-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MONTEREY CA
2021-02-05 831-231-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C GREENFIELD CA
2021-02-05 831-231-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C GREENFIELD CA
2021-02-05 831-652-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C CARMEL VLY CA
2021-02-05 831-830-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C KING CITY CA
2021-02-05 831-830-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C KING CITY CA
2021-02-05 831-830-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C KING CITY CA
2021-02-05 831-830-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C KING CITY CA
2021-02-05 831-877-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CARMEL CA
2021-01-28 831-204-4XXX 4000–4999Assigned TELNYX LLC 073H MONTEREY CA
2021-01-28 831-303-1XXX 1000–1999Assigned TELNYX LLC 073H SAN ARDO CA
2021-01-28 831-667-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BIG SUR CA
2021-01-27 831-243-7XXX 7000–7999Assigned TELNYX LLC 073H SALINAS CA
2021-01-20 831-215-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-01-20 831-215-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-01-20 831-215-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-01-20 831-215-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2021-01-08 831-305-4XXX 4000–4999Assigned METROPCS, INC. 5562 GONZALES CA
2021-01-07 831-356-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2021-01-07 831-356-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2020-12-22 831-432-8XXX 8000–8999Assigned FRACTEL, LLC 965H BOULDERCRK CA
2020-12-22 831-699-9XXX 9000–9999Assigned FRACTEL, LLC 965H FELTON CA
2020-12-15 831-382-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J SAN LUCAS CA
2020-12-15 831-632-6XXX 6000–6999Assigned TERRA NOVA TELECOM INC. 145J CASTROVL CA
2020-12-15 831-659-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J CARMEL VLY CA
2020-12-15 831-675-7XXX 7000–7999Assigned TERRA NOVA TELECOM INC. 145J GONZALES CA
2020-12-15 831-679-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J CHUALAR CA
2020-12-15 831-854-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2020-12-08 831-336-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J BEN LOMOND CA
2020-12-04 831-253-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SALINAS CA
2020-11-27 831-677-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOLEDAD 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.