Recent thousands-block assignments

10 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 406

T-MOBILE USA, INC. 7

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 2

NEW CINGULAR WIRELESS PCS, 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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2017-08-07	406-204-9XXX	9000–9999	Assigned	METROPCS, INC.	5562	HELENA	MT
2017-08-07	406-334-9XXX	9000–9999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	LIBBY	MT
2017-08-07	406-402-9XXX	9000–9999	Assigned	T-MOBILE USA, INC.	6529	GREATFALLS	MT
2017-08-02	406-561-9XXX	9000–9999	Assigned	T-MOBILE USA, INC.	6529	BILLINGS	MT
2017-07-26	406-413-6XXX	6000–6999	Assigned	TELEPORT COMMUNICATIONS AMERICA MT - LLC	771G	BILLINGS	MT
2017-07-25	406-940-5XXX	5000–5999	Assigned	NEW CINGULAR WIRELESS PCS, LLC	6010	MOLT	MT
2017-07-21	406-213-8XXX	8000–8999	Assigned	BANDWIDTH.COM CLEC, LLC - MT	994E	COLSTRIP	MT
2017-07-12	406-499-8XXX	8000–8999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	SEELEYLAKE	MT
2017-07-07	406-400-0XXX	0000–0999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-1XXX	1000–1999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-3XXX	3000–3999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-4XXX	4000–4999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-5XXX	5000–5999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-6XXX	6000–6999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-7XXX	7000–7999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-07	406-400-8XXX	8000–8999	Assigned	ONVOY, LLC - MT	453F	HAVRE	MT
2017-07-03	406-601-3XXX	3000–3999	Assigned	AIRUS, INC. - MT	588H	BILLINGS	MT
2017-06-28	406-310-7XXX	7000–7999	Assigned	METROPCS, INC.	5562	BUTTE	MT
2017-06-28	406-310-8XXX	8000–8999	Assigned	METROPCS, INC.	5562	BUTTE	MT
2017-06-27	406-838-8XXX	8000–8999	Assigned	ONVOY, LLC - MT	453F	COOKE CITY	MT
2017-06-27	406-838-9XXX	9000–9999	Assigned	ONVOY, LLC - MT	453F	COOKE CITY	MT
2017-06-12	406-229-2XXX	2000–2999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CUT BANK	MT
2017-06-12	406-287-0XXX	0000–0999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WHITEHALL	MT
2017-06-12	406-521-3XXX	3000–3999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	TOWNSEND	MT
2017-06-12	406-576-1XXX	1000–1999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CONRAD	MT
2017-06-07	406-399-8XXX	8000–8999	Assigned	TRIANGLE COMMUNICATION SYSTEM, INC. - MT-	958H	SOUTHHAVRE	MT
2017-05-25	406-602-6XXX	6000–6999	Assigned	TELEPORT COMMUNICATIONS AMERICA MT - LLC	771G	BOZEMAN	MT
2017-05-22	406-412-0XXX	0000–0999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-1XXX	1000–1999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-2XXX	2000–2999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-3XXX	3000–3999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-4XXX	4000–4999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-5XXX	5000–5999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-6XXX	6000–6999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-7XXX	7000–7999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-8XXX	8000–8999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-22	406-412-9XXX	9000–9999	Assigned	ONVOY, LLC - MT	453F	BILLINGS	MT
2017-05-16	406-218-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	MISSOULA	MT
2017-05-09	406-351-4XXX	4000–4999	Assigned	BANDWIDTH.COM CLEC, LLC - MT	994E	FORSYTH	MT
2017-05-03	406-282-8XXX	8000–8999	Assigned	ONVOY, LLC - MT	453F	MANHATTAN	MT
2017-05-03	406-300-3XXX	3000–3999	Assigned	ONVOY, LLC - MT	453F	KALISPELL	MT
2017-05-03	406-743-3XXX	3000–3999	Assigned	ONVOY, LLC - MT	453F	LAUREL	MT
2017-04-27	406-400-2XXX	2000–2999	Assigned	TRIANGLE COMMUNICATION SYSTEM, INC. - MT-	958H	HAVRE	MT
2017-04-24	406-932-7XXX	7000–7999	Assigned	CHARTER IP ENABLED SERVICES, LLC	792K	BIG TIMBER	MT
2017-04-10	406-792-5XXX	5000–5999	Assigned	T-MOBILE USA, INC.	6529	BUTTE	MT
2017-04-10	406-792-6XXX	6000–6999	Assigned	T-MOBILE USA, INC.	6529	BUTTE	MT
2017-03-28	406-916-8XXX	8000–8999	Assigned	T-MOBILE USA, INC.	6529	HELENA	MT
2017-03-28	406-916-9XXX	9000–9999	Assigned	T-MOBILE USA, INC.	6529	HELENA	MT
2017-03-22	406-510-0XXX	0000–0999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-1XXX	1000–1999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT

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.