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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2019-09-17 831-620-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CARMEL CA
2019-09-13 831-580-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 GONZALES CA
2019-09-11 831-292-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOLEDAD CA
2019-08-27 831-257-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L APTOS CA
2019-08-14 831-208-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-08-14 831-220-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MONTEREY CA
2019-08-14 831-231-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C GREENFIELD CA
2019-08-14 831-231-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C GREENFIELD CA
2019-08-14 831-292-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SOLEDAD CA
2019-08-14 831-292-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SOLEDAD CA
2019-08-14 831-348-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WATSONVL CA
2019-08-14 831-484-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-08-14 831-484-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-08-14 831-586-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SAN JUAN CA
2019-08-14 831-623-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SAN JUAN CA
2019-08-14 831-653-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SAN LUCAS CA
2019-08-14 831-653-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SAN LUCAS CA
2019-08-14 831-732-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SAN ARDO CA
2019-08-13 831-208-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2019-08-01 831-653-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAN LUCAS CA
2019-07-31 831-292-0XXX 0000–0999Assigned METROPCS, INC. 5562 SOLEDAD CA
2019-07-31 831-316-6XXX 6000–6999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2019-07-29 831-744-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GONZALES CA
2019-07-22 831-430-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SANTA CRUZ CA
2019-07-09 831-208-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALINAS CA
2019-07-02 831-533-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C BOULDERCRK CA
2019-07-01 831-208-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-07-01 831-208-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SALINAS CA
2019-07-01 831-292-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SOLEDAD CA
2019-07-01 831-292-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SOLEDAD CA
2019-07-01 831-593-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SAN JUAN CA
2019-07-01 831-593-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SAN JUAN CA
2019-07-01 831-653-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SAN LUCAS CA
2019-07-01 831-653-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SAN LUCAS CA
2019-07-01 831-732-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SAN ARDO CA
2019-07-01 831-921-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C TRES PINOS CA
2019-07-01 831-921-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C TRES PINOS CA
2019-06-28 831-263-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C KING CITY CA
2019-06-28 831-263-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C KING CITY CA
2019-06-28 831-298-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CARMEL VLY CA
2019-06-28 831-298-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CARMEL VLY CA
2019-06-28 831-705-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C CHUALAR CA
2019-06-28 831-705-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CHUALAR CA
2019-06-28 831-741-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C CASTROVL CA
2019-06-28 831-741-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CASTROVL CA
2019-06-28 831-744-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C GONZALES CA
2019-06-28 831-774-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C GONZALES CA
2019-06-28 831-877-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C CARMEL CA
2019-06-27 831-400-1XXX 1000–1999Assigned VOIP INNOVATIONS, LLC 597F SANTA CRUZ CA
2019-06-11 831-855-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEREY 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.