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
2005-08-23 310-230-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-382-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-401-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-401-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-584-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-584-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-985-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-23 310-985-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-08-18 310-417-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 INGLEWOOD CA
2005-08-18 310-496-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNMN SNMN CA
2005-08-18 310-747-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CMTN CMTN CA
2005-08-18 310-817-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CMTN GRDN CA
2005-08-18 310-975-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEVERLYHLS CA
2005-08-18 310-975-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEVERLYHLS CA
2005-08-17 310-904-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CULVERCITY CA
2005-08-16 310-558-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C CULVERCITY CA
2005-08-16 310-691-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2005-08-16 310-747-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2005-08-16 310-765-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C EL SEGUNDO CA
2005-08-16 310-878-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CMTN GRDN CA
2005-08-15 310-595-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BEVERLYHLS CA
2005-08-15 310-595-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BEVERLYHLS CA
2005-08-15 310-855-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-08-15 310-860-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2005-08-11 310-341-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
2005-08-10 310-401-2XXX 2000–2999Assigned PACIFIC BELL (COMPETITIVE) 7480 SNMN SNMN CA
2005-08-05 310-776-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D SNMN MRVS CA
2005-08-05 310-961-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TORRANCE CA
2005-08-05 310-961-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TORRANCE CA
2005-08-05 310-961-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TORRANCE CA
2005-08-03 310-237-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2005-08-03 310-736-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2005-08-03 310-736-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2005-08-03 310-961-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2005-08-03 310-961-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2005-07-27 310-986-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2005-07-27 310-986-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2005-07-26 310-359-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MALIBU CA
2005-07-26 310-406-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2005-07-26 310-697-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2005-07-25 310-706-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2005-07-25 310-744-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J EL SEGUNDO CA
2005-07-25 310-956-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J HAWTHORNE CA
2005-07-22 310-703-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2005-07-22 310-703-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2005-07-22 310-910-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 INGLEWOOD CA
2005-07-22 310-975-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2005-07-22 310-975-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2005-07-21 310-947-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2005-07-21 310-947-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D 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.