NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

15 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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, last 30 days — NPA 279
T-MOBILE USA, INC. 7
EXIANT COMMUNICATIONS LLC 3
NEW CINGULAR WIRELESS PCS, LLC 2
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 1
PAETEC ITEL, LLC 1
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
2018-03-28 279-888-2XXX 2000–2999Assigned IP HORIZON LLC 515J LINCOLN CA
2018-03-27 279-999-0XXX 0000–0999Assigned IP HORIZON LLC 515J SO PLACER CA
2018-03-20 279-200-0XXX 0000–0999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-03-20 279-200-1XXX 1000–1999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-03-20 279-200-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2018-03-20 279-200-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2018-03-20 279-200-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2018-03-20 279-200-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2018-03-20 279-200-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2018-03-20 279-321-5XXX 5000–5999Assigned IP HORIZON LLC 515J FOLSOM CA
2018-03-20 279-399-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2018-03-20 279-444-5XXX 5000–5999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-03-20 279-444-6XXX 6000–6999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-03-20 279-444-8XXX 8000–8999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-03-16 279-888-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LINCOLN CA
2018-03-12 279-200-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2018-03-12 279-444-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2018-03-12 279-444-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2018-03-12 279-444-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SCRM MAIN CA
2018-03-07 279-777-2XXX 2000–2999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 SCRM NORTH CA
2018-03-07 279-777-3XXX 3000–3999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 SCRM NORTH CA
2018-03-07 279-777-4XXX 4000–4999Assigned FIDIUM ENTERPRISE SERVICES, LLC 3964 SCRM NORTH CA
2018-01-23 279-444-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2018-01-23 279-777-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-01-23 279-888-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LINCOLN CA
2018-01-23 279-888-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C LINCOLN CA
2018-01-23 279-999-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2018-01-23 279-999-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2018-01-17 279-333-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ELK GROVE CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.