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
2005-04-01 310-256-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2005-04-01 310-683-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2005-04-01 310-683-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2005-04-01 310-894-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2005-03-30 310-256-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2005-03-30 310-256-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2005-03-30 310-256-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2005-03-30 310-573-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-03-30 310-698-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2005-03-30 310-802-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J REDONDO CA
2005-03-29 310-760-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J EL SEGUNDO CA
2005-03-29 310-760-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J EL SEGUNDO CA
2005-03-25 310-227-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2005-03-22 310-256-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2005-03-22 310-256-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2005-03-22 310-404-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2005-03-22 310-987-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2005-03-15 310-867-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J BEVERLYHLS CA
2005-03-14 310-561-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TORRANCE CA
2005-03-11 310-907-3XXX 3000–3999Assigned PACIFIC BELL (COMPETITIVE) 7480 SNMN SNMN CA
2005-03-11 310-907-4XXX 4000–4999Assigned PACIFIC BELL (COMPETITIVE) 7480 SNMN SNMN CA
2005-03-10 310-882-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2005-03-10 310-893-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2005-03-09 310-736-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULVERCITY CA
2005-03-09 310-945-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULVERCITY CA
2005-03-08 310-910-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D INGLEWOOD CA
2005-03-07 310-873-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C W ANGELES CA
2005-03-07 310-882-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-03-07 310-882-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-03-04 310-219-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2005-03-04 310-469-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C EL SEGUNDO CA
2005-03-04 310-651-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-03-04 310-697-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C REDONDO CA
2005-03-04 310-866-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2005-03-04 310-882-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-03-04 310-987-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D SAN PEDRO CA
2005-03-04 310-987-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2005-03-04 310-987-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2005-03-02 310-237-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2005-03-02 310-561-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-03-02 310-561-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C TORRANCE CA
2005-03-02 310-561-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-03-02 310-561-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-03-02 310-561-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-03-02 310-561-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-03-02 310-561-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-03-02 310-862-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNMN MRVS CA
2005-02-28 310-494-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2005-02-28 310-956-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2005-02-28 310-956-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE 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.