NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

15 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, 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
2019-08-09 279-800-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C ELK GROVE CA
2019-08-09 279-999-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SO PLACER CA
2019-08-06 279-666-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-08-06 279-666-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-08-06 279-777-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-08-05 279-300-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-08-05 279-300-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-08-05 279-300-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-08-05 279-300-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-07-24 279-999-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SO PLACER CA
2019-07-15 279-800-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ELK GROVE CA
2019-07-12 279-321-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FOLSOM CA
2019-07-12 279-900-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RSVL MAIN CA
2019-07-09 279-300-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2019-07-09 279-800-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-07-09 279-800-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-07-09 279-800-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-07-01 279-201-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2019-07-01 279-201-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2019-07-01 279-800-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ELK GROVE CA
2019-07-01 279-888-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C LINCOLN CA
2019-06-14 279-900-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RSVL MAIN CA
2019-06-13 279-999-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SO PLACER CA
2019-06-05 279-900-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RSVL MAIN CA
2019-06-05 279-999-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SO PLACER CA
2019-06-03 279-333-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-05-31 279-321-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2019-05-16 279-300-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2019-05-16 279-300-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2019-05-16 279-300-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2019-05-16 279-300-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2019-05-16 279-300-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2019-05-10 279-333-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-05-10 279-333-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELK GROVE CA
2019-05-03 279-200-9XXX 9000–9999Assigned HD CARRIER LLC 321J SCRM MAIN CA
2019-05-02 279-222-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-05-02 279-222-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-05-02 279-222-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-05-02 279-222-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-05-02 279-222-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-05-01 279-999-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SO PLACER CA
2019-04-30 279-201-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FAIR OAKS CA
2019-04-26 279-321-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2019-04-11 279-777-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM NORTH CA
2019-04-02 279-222-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2019-03-26 279-900-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RSVL MAIN CA
2019-03-18 279-222-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-03-18 279-222-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-03-18 279-222-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SCRM MAIN CA
2019-02-06 279-888-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LINCOLN 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.