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
2006-04-14 310-807-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C CMTN GRDN CA
2006-04-14 310-921-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2006-04-11 310-425-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2006-04-11 310-741-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2006-04-07 310-482-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-03-31 310-616-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2006-03-31 310-752-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2006-03-31 310-894-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2006-03-31 310-947-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2006-03-28 310-469-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2006-03-27 310-309-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2006-03-23 310-736-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2006-03-23 310-876-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2006-03-22 310-876-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2006-03-22 310-944-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 REDONDO CA
2006-03-14 310-424-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-03-14 310-808-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-03-14 310-808-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-03-08 310-406-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2006-03-08 310-465-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2006-03-08 310-750-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2006-03-01 310-424-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-03-01 310-424-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-03-01 310-424-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-02-28 310-745-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-02-28 310-754-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-02-27 310-997-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOMITA CA
2006-02-21 310-684-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN PEDRO CA
2006-02-20 310-760-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-02-20 310-793-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2006-02-20 310-796-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2006-02-20 310-886-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2006-02-10 310-862-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN MRVS CA
2006-02-08 310-590-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2006-02-07 310-752-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SNMN SNMN CA
2006-02-07 310-775-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2006-02-03 310-741-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2006-02-03 310-741-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2006-02-02 310-424-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BEVERLYHLS CA
2006-02-02 310-424-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J BEVERLYHLS CA
2006-02-02 310-424-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J BEVERLYHLS CA
2006-02-02 310-667-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2006-02-02 310-876-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2006-02-01 310-750-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L REDONDO CA
2006-01-30 310-997-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2006-01-30 310-997-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2006-01-20 310-684-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2006-01-20 310-775-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J W ANGELES CA
2006-01-20 310-775-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J W ANGELES CA
2006-01-18 310-341-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO 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.