NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

13 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2005-02-17 831-210-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2005-02-17 831-274-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2005-02-16 831-776-0XXX 0000–0999Assigned METROPCS, INC. 5562 SALINAS CA
2005-02-10 831-233-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MONTEREY CA
2005-02-08 831-207-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HOLLISTER CA
2005-02-08 831-421-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2005-02-08 831-421-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2004-12-17 831-534-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FELTON CA
2004-12-17 831-534-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FELTON CA
2004-11-12 831-420-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA CRUZ CA
2004-10-15 831-241-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2004-09-14 831-794-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALINAS CA
2004-09-14 831-794-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALINAS CA
2004-09-14 831-794-7XXX 7000–7999Assigned METROPCS, INC. 5562 SALINAS CA
2004-09-01 831-710-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALINAS CA
2004-08-31 831-533-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOULDERCRK CA
2004-08-31 831-536-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WATSONVL CA
2004-08-25 831-536-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WATSONVL CA
2004-07-19 831-331-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2004-07-19 831-331-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2004-07-19 831-331-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2004-07-19 831-331-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2004-07-19 831-331-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2004-06-24 831-331-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA CRUZ CA
2004-06-10 831-241-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2004-05-14 831-776-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALINAS CA
2004-04-14 831-869-6XXX 6000–6999Assigned METROPCS, INC. 5562 MONTEREY CA
2004-04-07 831-331-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2004-03-16 831-216-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FELTON CA
2004-03-16 831-337-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BOULDERCRK CA
2003-12-23 831-531-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 APTOS CA
2003-12-23 831-709-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEN LOMOND CA
2003-12-11 831-776-8XXX 8000–8999Assigned METROPCS, INC. 5562 SALINAS CA
2003-10-14 831-241-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2003-10-13 831-869-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MONTEREY CA
2003-09-26 831-435-5XXX 5000–5999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2003-09-26 831-512-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2003-09-11 831-227-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-227-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-359-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-359-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-359-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-11 831-359-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2003-09-02 831-524-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HOLLISTER CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.