NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 310
T-MOBILE USA, INC. 498
LEVEL 3 COMMUNICATIONS, LLC - CA 246
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 215
NEW CINGULAR WIRELESS PCS, LLC 198
ONVOY, LLC - CA 177
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
2011-08-23 310-912-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2011-08-23 310-912-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2011-08-23 310-912-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2011-08-22 310-935-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN PEDRO CA
2011-08-22 310-935-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN PEDRO CA
2011-08-16 310-935-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN PEDRO CA
2011-08-09 310-853-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CULVERCITY CA
2011-07-21 310-579-3XXX 3000–3999Assigned PACIFIC BELL (COMPETITIVE) 7480 MALIBU CA
2011-07-19 310-733-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2011-07-12 310-857-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2011-07-12 310-857-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2011-06-10 310-981-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 INGLEWOOD CA
2011-06-09 310-986-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J LOMITA CA
2011-05-26 310-626-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LOMITA CA
2011-04-26 310-935-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K SAN PEDRO CA
2011-04-25 310-935-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN PEDRO CA
2011-04-25 310-935-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SAN PEDRO CA
2011-04-25 310-981-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E INGLEWOOD CA
2011-04-22 310-426-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E EL SEGUNDO CA
2011-04-22 310-800-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN GRDN CA
2011-04-22 310-800-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN GRDN CA
2011-04-22 310-853-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2011-04-22 310-853-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2011-04-22 310-853-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2011-04-22 310-853-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2011-04-22 310-853-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2011-04-22 310-955-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E EL SEGUNDO CA
2011-04-13 310-735-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2011-04-13 310-853-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C CULVERCITY CA
2011-04-12 310-272-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEVERLYHLS CA
2011-04-12 310-846-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L INGLEWOOD CA
2011-04-08 310-694-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E W ANGELES CA
2011-04-08 310-893-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E W ANGELES CA
2011-03-25 310-510-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J AVALON CA
2011-03-21 310-295-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J W ANGELES CA
2011-03-21 310-921-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D REDONDO CA
2011-03-14 310-935-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN PEDRO CA
2011-03-08 310-321-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2011-02-28 310-331-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAWTHORNE CA
2011-02-28 310-359-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MALIBU CA
2011-02-28 310-405-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2011-02-28 310-776-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2011-02-28 310-817-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN GRDN CA
2011-02-22 310-935-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SAN PEDRO CA
2011-02-18 310-873-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C W ANGELES CA
2011-02-15 310-400-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2011-02-08 310-431-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2011-02-04 310-776-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D SNMN MRVS CA
2011-01-19 310-438-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2011-01-19 310-438-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN 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.