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
2004-12-10 310-818-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C CMTN GRDN CA
2004-12-10 310-984-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SAN PEDRO CA
2004-12-09 310-254-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-12-09 310-465-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 REDONDO CA
2004-12-09 310-689-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-12-09 310-956-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAWTHORNE CA
2004-12-02 310-984-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SAN PEDRO CA
2004-11-24 310-456-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2004-11-24 310-526-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2004-11-24 310-706-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2004-11-24 310-706-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2004-11-22 310-984-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN PEDRO CA
2004-11-19 310-492-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2004-11-19 310-654-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2004-11-19 310-654-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2004-11-19 310-697-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDONDO CA
2004-11-17 310-984-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN PEDRO CA
2004-11-16 310-697-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2004-11-16 310-741-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2004-11-16 310-741-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2004-11-16 310-741-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNMN MRVS CA
2004-11-16 310-894-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2004-11-11 310-623-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2004-11-11 310-623-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2004-11-11 310-623-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2004-11-08 310-654-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D INGLEWOOD CA
2004-11-05 310-465-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2004-11-05 310-465-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2004-11-05 310-465-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2004-11-05 310-467-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2004-11-05 310-467-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2004-11-05 310-467-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2004-11-02 310-437-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2004-10-28 310-747-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J CMTN CMTN CA
2004-10-28 310-782-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2004-10-28 310-782-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2004-10-21 310-514-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2004-10-19 310-218-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2004-10-19 310-953-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2004-10-15 310-602-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2004-10-15 310-743-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2004-10-15 310-743-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2004-10-15 310-906-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2004-10-15 310-966-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D W ANGELES CA
2004-10-11 310-889-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2004-10-11 310-909-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2004-10-07 310-220-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAWTHORNE CA
2004-09-28 310-401-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2004-09-28 310-876-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CULVERCITY CA
2004-09-28 310-876-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D CULVERCITY 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.