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
2005-10-03 310-295-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-10-03 310-295-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-10-03 310-295-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-10-03 310-295-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-10-03 310-425-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CULVERCITY CA
2005-10-03 310-921-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J REDONDO CA
2005-09-26 310-359-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MALIBU CA
2005-09-26 310-881-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNMN MRVS CA
2005-09-26 310-896-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 REDONDO CA
2005-09-23 310-736-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CULVERCITY CA
2005-09-23 310-982-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN PEDRO CA
2005-09-23 310-982-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN PEDRO CA
2005-09-20 310-982-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN PEDRO CA
2005-09-16 310-405-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2005-09-16 310-405-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2005-09-16 310-405-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2005-09-16 310-405-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 W ANGELES CA
2005-09-16 310-848-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HAWTHORNE CA
2005-09-16 310-997-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOMITA CA
2005-09-16 310-999-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CMTN GRDN CA
2005-09-15 310-651-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2005-09-15 310-691-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2005-09-15 310-691-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2005-09-13 310-591-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNMN MRVS CA
2005-09-12 310-526-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-09-12 310-570-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2005-09-12 310-848-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2005-09-12 310-848-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2005-09-12 310-848-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2005-09-12 310-944-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDONDO CA
2005-09-12 310-944-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDONDO CA
2005-09-08 310-824-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 W ANGELES CA
2005-09-08 310-848-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2005-09-08 310-988-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C INGLEWOOD CA
2005-09-08 310-997-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C LOMITA CA
2005-09-06 310-359-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2005-09-06 310-359-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MALIBU CA
2005-09-06 310-694-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2005-09-02 310-237-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2005-08-30 310-221-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SAN PEDRO CA
2005-08-30 310-746-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2005-08-30 310-746-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2005-08-30 310-746-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2005-08-30 310-961-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C TORRANCE CA
2005-08-30 310-982-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D SAN PEDRO CA
2005-08-30 310-982-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D SAN PEDRO CA
2005-08-29 310-954-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2005-08-25 310-961-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-08-25 310-961-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2005-08-25 310-961-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE 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.