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
2021-01-20 310-565-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F EL SEGUNDO CA
2020-12-11 310-290-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2020-12-11 310-290-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2020-12-11 310-290-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2020-12-09 310-388-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2020-10-13 310-810-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2020-10-13 310-810-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2020-10-13 310-810-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2020-10-13 310-810-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2020-10-13 310-810-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2020-08-28 310-565-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2020-08-28 310-565-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2020-08-28 310-565-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2020-05-05 310-868-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 CMTN CMTN CA
2019-05-17 310-289-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEVERLYHLS CA
2019-05-10 310-879-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN GRDN CA
2019-02-27 310-777-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2018-08-17 310-620-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2018-08-17 310-620-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2018-08-17 310-620-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2018-08-17 310-620-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2018-08-10 310-321-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2018-03-29 310-554-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CMTN CMTN CA
2018-01-03 310-554-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2018-01-03 310-554-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2018-01-03 310-554-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2017-12-15 310-778-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2017-12-08 310-688-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BEVERLYHLS CA
2017-12-08 310-688-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BEVERLYHLS CA
2017-11-29 310-688-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BEVERLYHLS CA
2017-11-29 310-778-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2017-11-29 310-778-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2017-11-29 310-778-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2017-11-29 310-778-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2017-11-29 310-778-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN GRDN CA
2017-10-31 310-705-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN CMTN CA
2017-10-31 310-705-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN CMTN CA
2017-10-31 310-705-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CMTN CMTN CA
2017-10-24 310-340-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAWTHORNE CA
2017-08-31 310-620-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 BEVERLYHLS CA
2017-07-19 310-642-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D INGLEWOOD CA
2017-07-17 310-620-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEVERLYHLS CA
2017-07-03 310-682-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE 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.