NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 312
BANDWIDTH.COM CLEC, LLC - IL 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
2018-06-26 312-481-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-06-26 312-481-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-06-26 312-481-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-06-26 312-736-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-06-26 312-736-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-06-25 312-736-0XXX 0000–0999Assigned TELNYX LLC 073H CHICGOZN01 IL
2018-06-14 312-728-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2018-06-13 312-728-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-06-13 312-728-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-06-13 312-728-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-06-13 312-728-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-06-13 312-728-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-25 312-761-0XXX 0000–0999Assigned TELENGY LLC 148J CHICGOZN01 IL
2018-05-24 312-392-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2018-05-24 312-500-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-5XXX 5000–5999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-6XXX 6000–6999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-24 312-500-9XXX 9000–9999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-05-10 312-815-0XXX 0000–0999Assigned AIRESPRING, INC. 996H CHICGOZN01 IL
2018-05-02 312-741-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-05-02 312-741-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-05-02 312-741-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-05-02 312-741-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2018-04-12 312-312-0XXX 0000–0999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2018-04-12 312-312-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2018-04-12 312-312-4XXX 4000–4999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2018-04-12 312-312-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2018-04-12 312-312-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2018-04-12 312-392-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2018-04-12 312-392-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2018-04-12 312-392-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2018-04-02 312-312-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2018-03-21 312-728-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2018-03-21 312-728-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2018-02-28 312-728-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2018-02-16 312-380-7XXX 7000–7999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2018-02-16 312-736-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2018-01-19 312-312-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-01-19 312-312-5XXX 5000–5999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-01-19 312-312-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2018-01-19 312-312-9XXX 9000–9999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2017-12-06 312-392-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2017-12-06 312-392-5XXX 5000–5999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2017-11-24 312-392-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D CHICGOZN01 IL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.