NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2006-06-07 310-734-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-06-07 310-746-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-06-07 310-997-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOMITA CA
2006-06-01 310-598-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-05-31 310-818-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-05-31 310-818-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-05-26 310-469-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J EL SEGUNDO CA
2006-05-25 310-484-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2006-05-25 310-579-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2006-05-25 310-896-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D REDONDO CA
2006-05-25 310-896-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2006-05-24 310-425-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2006-05-24 310-425-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2006-05-15 310-616-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C EL SEGUNDO CA
2006-05-12 310-237-9XXX 9000–9999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CULVERCITY CA
2006-05-12 310-439-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNMN MRVS CA
2006-05-12 310-589-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MALIBU CA
2006-05-12 310-747-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN CMTN CA
2006-05-12 310-765-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 EL SEGUNDO CA
2006-05-12 310-848-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 HAWTHORNE CA
2006-05-12 310-878-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2006-05-12 310-974-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TORRANCE CA
2006-05-10 310-998-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2006-05-09 310-436-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-05-08 310-402-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-05-08 310-733-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2006-05-05 310-584-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2006-05-05 310-775-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 W ANGELES CA
2006-05-05 310-876-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULVERCITY CA
2006-05-04 310-334-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-05-04 310-382-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2006-05-04 310-460-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2006-05-04 310-526-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2006-05-04 310-661-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2006-05-04 310-661-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2006-05-04 310-668-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2006-05-04 310-752-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2006-05-04 310-773-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-05-03 310-221-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN PEDRO CA
2006-05-03 310-382-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNMN SNMN CA
2006-05-03 310-961-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TORRANCE CA
2006-05-02 310-988-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2006-05-01 310-740-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNMN MRVS CA
2006-04-24 310-355-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAWTHORNE CA
2006-04-18 310-752-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K SNMN SNMN CA
2006-04-17 310-499-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BEVERLYHLS CA
2006-04-17 310-499-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BEVERLYHLS CA
2006-04-17 310-775-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2006-04-17 310-997-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LOMITA CA
2006-04-14 310-807-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CMTN GRDN CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.