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
2014-10-24 831-313-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HOLLISTER CA
2014-10-20 831-856-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 GREENFIELD CA
2014-10-17 831-290-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GONZALES CA
2014-10-15 831-673-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HOLLISTER CA
2014-10-14 831-319-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WATSONVL CA
2014-10-08 831-242-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2014-10-08 831-242-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2014-10-03 831-324-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEREY CA
2014-10-02 831-346-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA CRUZ CA
2014-09-30 831-652-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CARMEL VLY CA
2014-09-23 831-346-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SANTA CRUZ CA
2014-09-18 831-293-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CARMEL CA
2014-09-18 831-975-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2014-09-17 831-210-7XXX 7000–7999Assigned METROPCS, INC. 5562 SALINAS CA
2014-09-17 831-785-9XXX 9000–9999Assigned METROPCS, INC. 5562 SALINAS CA
2014-09-15 831-245-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HOLLISTER CA
2014-09-08 831-800-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SALINAS CA
2014-09-08 831-800-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SALINAS CA
2014-09-04 831-291-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2014-09-04 831-291-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2014-09-04 831-444-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2014-09-04 831-484-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2014-09-03 831-296-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SALINAS CA
2014-09-02 831-263-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E KING CITY CA
2014-09-02 831-265-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HOLLISTER CA
2014-08-29 831-800-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SALINAS CA
2014-08-28 831-744-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GONZALES CA
2014-08-28 831-744-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GONZALES CA
2014-08-20 831-219-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E APTOS CA
2014-08-20 831-708-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E APTOS CA
2014-08-14 831-246-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEN LOMOND CA
2014-08-12 831-324-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2014-08-08 831-975-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2014-08-08 831-975-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2014-08-05 831-291-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2014-07-31 831-275-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MONTEREY CA
2014-07-31 831-275-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MONTEREY CA
2014-07-30 831-291-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA CRUZ CA
2014-07-30 831-291-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA CRUZ CA
2014-07-30 831-884-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEREY CA
2014-07-22 831-237-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SOLEDAD CA
2014-07-22 831-586-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN JUAN CA
2014-07-22 831-652-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CARMEL VLY CA
2014-07-22 831-856-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GREENFIELD CA
2014-07-14 831-293-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CARMEL CA
2014-07-10 831-217-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C BOULDERCRK CA
2014-07-03 831-244-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BIG SUR CA
2014-06-18 831-821-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TRES PINOS CA
2014-06-18 831-901-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MONTEREY CA
2014-06-11 831-244-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BIG SUR 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.