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
2003-05-27 310-483-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-483-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-483-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-483-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-483-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-773-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2003-05-27 310-803-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-953-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-27 310-953-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-05-23 310-597-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2003-05-23 310-597-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2003-05-23 310-597-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2003-05-23 310-597-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2003-05-23 310-597-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2003-05-23 310-733-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULVERCITY CA
2003-05-23 310-733-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULVERCITY CA
2003-05-23 310-733-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULVERCITY CA
2003-05-19 310-894-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2003-05-16 310-220-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2003-05-16 310-349-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2003-05-16 310-406-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2003-05-16 310-507-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2003-05-16 310-626-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2003-05-16 310-774-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2003-05-13 310-356-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J EL SEGUNDO CA
2003-05-12 310-421-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2003-05-12 310-421-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2003-05-12 310-421-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2003-05-01 310-431-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2003-05-01 310-431-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2003-04-15 310-254-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J W ANGELES CA
2003-04-15 310-895-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2003-04-15 310-895-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2003-04-15 310-895-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2003-04-14 310-602-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOMITA CA
2003-04-09 310-356-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2003-04-09 310-356-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2003-04-04 310-774-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2003-03-19 310-347-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-03-19 310-347-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-03-19 310-347-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2003-03-17 310-221-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN PEDRO CA
2003-03-17 310-347-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J TORRANCE CA
2003-03-17 310-349-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HAWTHORNE CA
2003-03-17 310-590-1XXX 1000–1999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J INGLEWOOD CA
2003-03-17 310-590-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J INGLEWOOD CA
2003-03-17 310-626-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LOMITA CA
2003-03-13 310-321-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J EL SEGUNDO CA
2003-03-13 310-733-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CULVERCITY CA
2003-03-06 310-303-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 REDONDO 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.