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
2005-07-20 310-401-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-07-20 310-547-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SAN PEDRO CA
2005-07-20 310-703-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J INGLEWOOD CA
2005-07-20 310-893-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J W ANGELES CA
2005-07-19 310-633-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2005-07-19 310-703-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2005-07-19 310-735-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2005-07-19 310-876-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2005-07-19 310-883-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2005-07-18 310-689-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2005-07-15 310-703-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2005-07-15 310-703-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2005-07-14 310-703-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J INGLEWOOD CA
2005-07-12 310-280-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2005-07-12 310-303-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2005-07-11 310-928-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2005-07-11 310-928-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2005-07-11 310-928-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2005-07-11 310-928-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2005-07-08 310-525-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
2005-07-08 310-525-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
2005-07-08 310-525-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
2005-07-08 310-525-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
2005-07-08 310-892-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
2005-06-23 310-910-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2005-06-23 310-910-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2005-06-23 310-986-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2005-06-22 310-359-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2005-06-22 310-893-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 W ANGELES CA
2005-06-21 310-773-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2005-06-21 310-773-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2005-06-21 310-929-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 AVALON CA
2005-06-21 310-975-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BEVERLYHLS CA
2005-06-20 310-220-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2005-06-20 310-297-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2005-06-16 310-496-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SNMN SNMN CA
2005-06-10 310-817-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2005-06-08 310-557-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2005-06-08 310-598-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-06-08 310-598-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-06-08 310-598-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-06-08 310-651-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-06-08 310-986-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C LOMITA CA
2005-06-03 310-469-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2005-06-03 310-867-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2005-06-01 310-728-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BEVERLYHLS CA
2005-05-31 310-400-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2005-05-31 310-802-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2005-05-31 310-855-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BEVERLYHLS CA
2005-05-31 310-933-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 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.