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
2019-02-06 279-888-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LINCOLN CA
2019-02-06 279-888-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LINCOLN CA
2019-02-06 279-888-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LINCOLN CA
2019-02-06 279-888-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LINCOLN CA
2019-02-04 279-201-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FAIR OAKS CA
2019-02-04 279-201-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FAIR OAKS CA
2019-01-30 279-321-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C FOLSOM CA
2019-01-23 279-222-2XXX 2000–2999Assigned FRACTEL, LLC 965H SCRM MAIN CA
2019-01-23 279-800-0XXX 0000–0999Assigned FRACTEL, LLC 965H ELK GROVE CA
2019-01-23 279-900-0XXX 0000–0999Assigned FRACTEL, LLC 965H RSVL MAIN CA
2019-01-22 279-666-6XXX 6000–6999Assigned FRACTEL, LLC 965H SCRM NORTH CA
2019-01-15 279-333-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C ELK GROVE CA
2019-01-15 279-333-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C ELK GROVE CA
2018-11-13 279-777-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D SCRM NORTH CA
2018-11-13 279-777-1XXX 1000–1999Assigned VONAGE AMERICA LLC 197D SCRM NORTH CA
2018-11-13 279-777-8XXX 8000–8999Assigned VONAGE AMERICA LLC 197D SCRM NORTH CA
2018-10-08 279-321-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FOLSOM CA
2018-10-04 279-333-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ELK GROVE CA
2018-09-24 279-321-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FOLSOM CA
2018-09-18 279-777-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SCRM NORTH CA
2018-09-04 279-201-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2018-09-04 279-201-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C FAIR OAKS CA
2018-09-04 279-333-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ELK GROVE CA
2018-08-29 279-321-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FOLSOM CA
2018-08-29 279-321-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C FOLSOM CA
2018-08-22 279-972-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-22 279-972-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SCRM NORTH CA
2018-08-15 279-399-6XXX 6000–6999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-08-10 279-399-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2018-08-10 279-399-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2018-08-10 279-399-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2018-08-10 279-399-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SCRM MAIN CA
2018-07-18 279-399-0XXX 0000–0999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-07-18 279-399-1XXX 1000–1999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-07-18 279-444-1XXX 1000–1999Assigned METROPCS, INC. 5562 SCRM MAIN CA
2018-06-11 279-321-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FOLSOM CA
2018-06-07 279-444-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM MAIN CA
2018-05-18 279-399-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2018-05-18 279-399-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SCRM MAIN CA
2018-05-14 279-333-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELK GROVE CA
2018-05-14 279-444-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SCRM MAIN CA
2018-03-28 279-333-2XXX 2000–2999Assigned IP HORIZON LLC 515J 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.