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 972
SOUTHWESTERN BELL TELEPHONE COMPANY - TX 46
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
2017-03-29 972-990-0XXX 0000–0999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-1XXX 1000–1999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-2XXX 2000–2999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-3XXX 3000–3999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-4XXX 4000–4999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-5XXX 5000–5999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-7XXX 7000–7999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2017-03-29 972-990-9XXX 9000–9999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-2XXX 2000–2999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-3XXX 3000–3999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-4XXX 4000–4999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-5XXX 5000–5999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-7XXX 7000–7999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-09-02 972-817-9XXX 9000–9999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-07-21 972-817-0XXX 0000–0999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2016-07-21 972-817-1XXX 1000–1999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2010-11-20 972-372-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2010-09-24 972-891-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2009-10-07 972-428-4XXX 4000–4999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 CARROLLTON TX
2009-09-24 972-652-2XXX 2000–2999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2009-02-06 972-459-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 LEWISVILLE TX
2009-01-06 972-468-3XXX 3000–3999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2008-12-03 972-696-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2008-02-21 972-941-1XXX 1000–1999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2008-02-05 972-696-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2007-12-18 972-652-3XXX 3000–3999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2007-04-20 972-820-1XXX 1000–1999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 CARROLLTON TX
2006-09-27 972-505-7XXX 7000–7999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2006-08-07 972-798-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 CARROLLTON TX
2006-07-27 972-350-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 LEWISVILLE TX
2006-07-27 972-350-7XXX 7000–7999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 LEWISVILLE TX
2006-02-22 972-906-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 LEWISVILLE TX
2002-10-23 972-526-1XXX 1000–1999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-10-23 972-526-2XXX 2000–2999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-10-23 972-526-3XXX 3000–3999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-10-23 972-526-4XXX 4000–4999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-10-23 972-526-6XXX 6000–6999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-10-23 972-526-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-10-23 972-526-9XXX 9000–9999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 PLANO TX
2002-09-26 972-215-5XXX 5000–5999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2002-09-26 972-607-7XXX 7000–7999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX
2002-09-26 972-607-8XXX 8000–8999Assigned SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 IRVING TX

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.