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
2006-12-15 310-648-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-12-15 310-648-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-12-15 310-754-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-12-15 310-913-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-12-08 310-606-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2006-12-08 310-606-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2006-12-06 310-819-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-12-06 310-929-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E AVALON CA
2006-12-05 310-310-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K SNMN SNMN CA
2006-11-29 310-310-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SNMN SNMN CA
2006-11-21 310-661-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2006-11-21 310-747-2XXX 2000–2999Assigned CURATEL, LLC - CA 993B CMTN CMTN CA
2006-11-20 310-341-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-20 310-906-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-20 310-906-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-20 310-906-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-20 310-906-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-16 310-574-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNMN MRVS CA
2006-11-16 310-574-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNMN MRVS CA
2006-11-15 310-343-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-10 310-426-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-11-09 310-574-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2006-11-02 310-414-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-11-02 310-808-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-10-24 310-343-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-10-20 310-819-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-10-20 310-970-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2006-10-16 310-343-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-10-09 310-606-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2006-10-06 310-662-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-10-04 310-591-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-10-03 310-651-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-10-03 310-817-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-10-03 310-817-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-10-03 310-926-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-09-29 310-438-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN CMTN CA
2006-09-29 310-735-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN CMTN CA
2006-09-28 310-579-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MALIBU CA
2006-09-28 310-651-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-09-27 310-658-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-09-27 310-658-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2006-09-26 310-591-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNMN MRVS CA
2006-09-26 310-773-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNMN MRVS CA
2006-09-18 310-751-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-09-14 310-662-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-09-07 310-243-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-09-07 310-594-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-09-07 310-594-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-09-07 310-594-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-09-07 310-660-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN 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.