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
2007-10-02 831-350-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TRES PINOS CA
2007-09-11 831-223-6XXX 6000–6999Assigned METROPCS, INC. 5562 SOLEDAD CA
2007-09-11 831-707-3XXX 3000–3999Assigned METROPCS, INC. 5562 WATSONVL CA
2007-09-07 831-233-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2007-09-07 831-737-2XXX 2000–2999Assigned METROPCS, INC. 5562 SALINAS CA
2007-09-07 831-737-4XXX 4000–4999Assigned METROPCS, INC. 5562 SALINAS CA
2007-09-07 831-737-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALINAS CA
2007-09-06 831-428-1XXX 1000–1999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2007-09-06 831-428-3XXX 3000–3999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2007-08-10 831-333-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEREY CA
2007-08-10 831-713-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2007-08-10 831-713-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2007-08-10 831-737-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2007-08-10 831-737-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2007-08-10 831-902-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HOLLISTER CA
2007-07-17 831-663-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2007-07-10 831-264-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MONTEREY CA
2007-07-10 831-537-6XXX 6000–6999Assigned METROPCS, INC. 5562 HOLLISTER CA
2007-07-10 831-585-4XXX 4000–4999Assigned METROPCS, INC. 5562 SALINAS CA
2007-07-05 831-713-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2007-07-03 831-539-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C WATSONVL CA
2007-06-29 831-420-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2007-06-28 831-316-8XXX 8000–8999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2007-06-28 831-613-2XXX 2000–2999Assigned METROPCS, INC. 5562 GREENFIELD CA
2007-06-21 831-269-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SALINAS CA
2007-06-08 831-240-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SALINAS CA
2007-04-10 831-576-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SANTA CRUZ CA
2007-03-08 831-585-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2007-02-15 831-233-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J MONTEREY CA
2007-02-13 831-676-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2007-02-13 831-676-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SALINAS CA
2007-02-06 831-869-2XXX 2000–2999Assigned METROPCS, INC. 5562 MONTEREY CA
2007-01-31 831-535-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SANTA CRUZ CA
2007-01-22 831-207-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HOLLISTER CA
2007-01-12 831-537-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HOLLISTER CA
2007-01-12 831-998-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SALINAS CA
2007-01-12 831-998-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SALINAS CA
2006-12-27 831-430-8XXX 8000–8999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2006-12-27 831-920-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MONTEREY CA
2006-12-27 831-920-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MONTEREY CA
2006-12-14 831-267-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BIG SUR CA
2006-10-20 831-223-5XXX 5000–5999Assigned AT&T - LOCAL 7421 SOLEDAD CA
2006-10-19 831-536-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WATSONVL CA
2006-10-19 831-540-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2006-10-10 831-212-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2006-10-10 831-212-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA CRUZ CA
2006-10-10 831-585-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2006-10-05 831-600-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA CRUZ CA
2006-10-05 831-600-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA CRUZ CA
2006-09-13 831-585-2XXX 2000–2999Assigned METROPCS, INC. 5562 SALINAS 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.