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
2019-05-24 831-208-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALINAS CA
2019-05-24 831-220-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MONTEREY CA
2019-05-07 831-889-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2019-05-03 831-231-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C GREENFIELD CA
2019-05-01 831-643-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MONTEREY CA
2019-04-29 831-293-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CARMEL CA
2019-04-12 831-292-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOLEDAD CA
2019-04-08 831-887-7XXX 7000–7999Assigned TERRA NOVA TELECOM INC. 145J MONTEREY CA
2019-04-02 831-208-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SALINAS CA
2019-03-20 831-208-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2019-03-20 831-348-6XXX 6000–6999Assigned FRACTEL, LLC 965H WATSONVL CA
2019-03-20 831-877-7XXX 7000–7999Assigned FRACTEL, LLC 965H CARMEL CA
2019-03-20 831-877-8XXX 8000–8999Assigned FRACTEL, LLC 965H CARMEL CA
2019-03-12 831-297-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HOLLISTER CA
2019-03-05 831-202-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SALINAS CA
2019-03-04 831-717-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MONTEREY CA
2019-02-27 831-202-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-02-27 831-202-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-02-27 831-202-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-02-27 831-290-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C GONZALES CA
2019-02-27 831-290-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C GONZALES CA
2019-02-26 831-401-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEN LOMOND CA
2019-02-20 831-265-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C HOLLISTER CA
2019-02-20 831-265-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HOLLISTER CA
2019-02-20 831-844-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C BIG SUR CA
2019-02-20 831-844-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C BIG SUR CA
2019-02-20 831-867-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2019-02-20 831-867-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2019-01-24 831-268-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FELTON CA
2019-01-24 831-268-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FELTON CA
2019-01-24 831-400-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2019-01-24 831-400-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2019-01-24 831-889-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2019-01-24 831-889-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2019-01-16 831-387-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 KING CITY CA
2019-01-08 831-292-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOLEDAD CA
2018-10-18 831-532-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BEN LOMOND CA
2018-10-17 831-741-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASTROVL CA
2018-09-25 831-249-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BIG SUR CA
2018-09-24 831-315-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SOLEDAD CA
2018-09-18 831-652-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CARMEL VLY CA
2018-09-05 831-889-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2018-09-04 831-202-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SALINAS CA
2018-08-30 831-202-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2018-08-30 831-202-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2018-08-21 831-453-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CASTROVL CA
2018-08-15 831-315-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOLEDAD CA
2018-07-30 831-202-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALINAS CA
2018-07-30 831-666-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WATSONVL CA
2018-06-29 831-202-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALINAS 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.