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
2006-09-07 310-715-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-08-31 310-881-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2006-08-31 310-933-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2006-08-29 310-648-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K EL SEGUNDO CA
2006-08-29 310-817-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K CMTN GRDN CA
2006-08-29 310-817-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K CMTN GRDN CA
2006-08-18 310-933-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CMTN CMTN CA
2006-08-18 310-933-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CMTN CMTN CA
2006-08-09 310-751-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K SNMN MRVS CA
2006-08-08 310-448-1XXX 1000–1999Assigned IP HORIZON LLC 515J SNMN MRVS CA
2006-08-08 310-448-2XXX 2000–2999Assigned IP HORIZON LLC 515J SNMN MRVS CA
2006-08-06 310-878-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CMTN GRDN CA
2006-08-04 310-765-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-08-04 310-955-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-08-04 310-955-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-08-04 310-955-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-08-01 310-765-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2006-07-26 310-755-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TORRANCE CA
2006-07-24 310-929-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 AVALON CA
2006-07-19 310-424-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-07-17 310-591-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2006-07-17 310-591-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2006-07-13 310-857-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2006-07-07 310-401-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNMN SNMN CA
2006-07-05 310-913-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2006-07-05 310-913-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2006-07-05 310-913-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2006-07-05 310-913-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2006-07-03 310-956-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2006-07-03 310-970-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2006-06-29 310-616-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2006-06-29 310-776-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J SNMN MRVS CA
2006-06-29 310-776-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J SNMN MRVS CA
2006-06-29 310-807-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CMTN GRDN CA
2006-06-29 310-807-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J CMTN GRDN CA
2006-06-27 310-606-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J EL SEGUNDO CA
2006-06-22 310-343-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-06-22 310-343-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2006-06-20 310-425-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2006-06-14 310-594-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-06-14 310-856-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN GRDN CA
2006-06-13 310-651-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-06-13 310-691-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2006-06-13 310-883-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D SNMN SNMN CA
2006-06-12 310-598-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-06-12 310-598-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-06-12 310-601-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2006-06-12 310-819-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C CMTN GRDN CA
2006-06-09 310-734-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C BEVERLYHLS CA
2006-06-09 310-933-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C 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.