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
2004-09-22 310-436-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CMTN GRDN CA
2004-09-20 310-743-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2004-09-16 310-467-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2004-09-16 310-926-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2004-09-15 310-272-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2004-09-14 310-507-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN PEDRO CA
2004-09-10 310-694-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 W ANGELES CA
2004-09-08 310-689-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-09-08 310-696-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-09-08 310-696-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-09-08 310-696-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-09-07 310-696-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J W ANGELES CA
2004-09-03 310-347-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C TORRANCE CA
2004-09-02 310-507-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SAN PEDRO CA
2004-09-01 310-526-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2004-08-31 310-317-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C MALIBU CA
2004-08-31 310-460-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNMN SNMN CA
2004-08-31 310-706-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HAWTHORNE CA
2004-08-25 310-570-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNMN SNMN CA
2004-08-21 310-893-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C W ANGELES CA
2004-08-20 310-421-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2004-08-20 310-846-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2004-08-20 310-933-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2004-08-19 310-406-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 REDONDO CA
2004-08-19 310-760-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EL SEGUNDO CA
2004-08-19 310-760-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EL SEGUNDO CA
2004-08-19 310-867-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEVERLYHLS CA
2004-08-19 310-867-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEVERLYHLS CA
2004-08-19 310-909-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 W ANGELES CA
2004-08-13 310-349-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2004-08-13 310-531-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2004-08-13 310-694-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2004-08-12 310-357-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2004-08-12 310-357-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2004-08-11 310-695-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2004-08-04 310-658-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EL SEGUNDO CA
2004-07-30 310-626-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2004-07-22 310-401-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2004-07-22 310-694-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 W ANGELES CA
2004-07-21 310-220-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2004-07-21 310-431-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D INGLEWOOD CA
2004-07-21 310-693-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2004-07-21 310-695-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2004-07-21 310-696-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-07-21 310-844-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2004-07-21 310-910-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D INGLEWOOD CA
2004-07-19 310-683-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDONDO CA
2004-07-19 310-683-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDONDO CA
2004-07-13 310-254-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2004-07-13 310-254-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 W ANGELES 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.