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

SOUTHWESTERN BELL 28

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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2017-05-22	972-433-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL	9533	PROSPER	TX
2017-03-29	972-990-0XXX	0000–0999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-2XXX	2000–2999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-3XXX	3000–3999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-5XXX	5000–5999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-7XXX	7000–7999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-8XXX	8000–8999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-29	972-990-9XXX	9000–9999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-01-26	972-940-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL	9533	DALLAS	TX
2017-01-26	972-940-7XXX	7000–7999	Assigned	SOUTHWESTERN BELL	9533	DALLAS	TX
2016-09-02	972-817-2XXX	2000–2999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-3XXX	3000–3999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-5XXX	5000–5999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-7XXX	7000–7999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-8XXX	8000–8999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-09-02	972-817-9XXX	9000–9999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-07-21	972-817-0XXX	0000–0999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-07-21	972-817-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2013-04-16	972-598-8XXX	8000–8999	Assigned	SOUTHWESTERN BELL	9533	DALLAS	TX
2013-03-12	972-598-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL	9533	DALLAS	TX
2012-11-27	972-908-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2010-11-20	972-372-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	PLANO	TX
2010-10-27	972-908-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2010-09-24	972-891-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2010-09-20	972-908-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2009-10-07	972-428-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	CARROLLTON	TX
2009-09-24	972-652-2XXX	2000–2999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2009-05-08	972-863-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL	9533	DALLAS	TX
2009-05-08	972-863-5XXX	5000–5999	Assigned	SOUTHWESTERN BELL	9533	DALLAS	TX
2009-02-06	972-459-8XXX	8000–8999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	LEWISVILLE	TX
2009-01-06	972-468-3XXX	3000–3999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	PLANO	TX
2008-12-03	972-696-8XXX	8000–8999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	PLANO	TX
2008-06-23	972-649-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2008-06-23	972-649-3XXX	3000–3999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2008-02-21	972-941-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	PLANO	TX
2008-02-05	972-649-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2008-02-05	972-649-7XXX	7000–7999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2008-02-05	972-696-6XXX	6000–6999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	PLANO	TX
2007-12-18	972-652-3XXX	3000–3999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2007-07-02	972-908-2XXX	2000–2999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2007-07-02	972-908-3XXX	3000–3999	Assigned	SOUTHWESTERN BELL	9533	ALLEN	TX
2007-05-24	972-987-4XXX	4000–4999	Assigned	SOUTHWESTERN BELL	9533	FRISCO	TX
2007-04-20	972-820-1XXX	1000–1999	Assigned	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	CARROLLTON	TX
2007-01-30	972-961-0XXX	0000–0999	Assigned	SOUTHWESTERN BELL	9533	ROCKWALL	TX
2006-09-27	972-505-7XXX	7000–7999	Assigned	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.