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
2017-03-22	406-510-2XXX	2000–2999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-3XXX	3000–3999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-4XXX	4000–4999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-5XXX	5000–5999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-6XXX	6000–6999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-7XXX	7000–7999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-8XXX	8000–8999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-22	406-510-9XXX	9000–9999	Assigned	ONVOY, LLC - MT	453F	MISSOULA	MT
2017-03-21	406-298-6XXX	6000–6999	Assigned	TELNYX LLC	073H	COLUMBUS	MT
2017-03-21	406-445-6XXX	6000–6999	Assigned	TELNYX LLC	073H	RED LODGE	MT
2017-03-21	406-548-9XXX	9000–9999	Assigned	TELNYX LLC	073H	BOZEMAN	MT
2017-03-21	406-623-3XXX	3000–3999	Assigned	TELNYX LLC	073H	HARDIN	MT
2017-03-21	406-630-0XXX	0000–0999	Assigned	TELNYX LLC	073H	SIDNEY	MT
2017-03-21	406-743-6XXX	6000–6999	Assigned	TELNYX LLC	073H	LAUREL	MT
2017-03-21	406-813-9XXX	9000–9999	Assigned	TELNYX LLC	073H	BELGRADE	MT
2017-03-21	406-852-8XXX	8000–8999	Assigned	TELNYX LLC	073H	MILES CITY	MT
2017-03-21	406-946-9XXX	9000–9999	Assigned	TELNYX LLC	073H	LIVINGSTON	MT
2017-03-20	406-831-4XXX	4000–4999	Assigned	TELEPORT COMMUNICATIONS AMERICA MT - LLC	771G	BILLINGS	MT
2017-03-15	406-304-7XXX	7000–7999	Assigned	T-MOBILE USA, INC.	6529	MISSOULA	MT
2017-03-15	406-304-8XXX	8000–8999	Assigned	T-MOBILE USA, INC.	6529	MISSOULA	MT
2017-03-13	406-413-9XXX	9000–9999	Assigned	AIRUS, INC. - MT	588H	BILLINGS	MT
2017-03-03	406-283-3XXX	3000–3999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MT	9415	LIBBY	MT
2017-03-03	406-295-8XXX	8000–8999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MT	9415	TROY	MT
2017-02-28	406-215-5XXX	5000–5999	Assigned	METROPCS, INC.	5562	MISSOULA	MT
2017-02-28	406-215-6XXX	6000–6999	Assigned	METROPCS, INC.	5562	MISSOULA	MT
2017-01-27	406-201-8XXX	8000–8999	Assigned	BANDWIDTH.COM CLEC, LLC - MT	994E	FORSYTH	MT
2016-12-21	406-831-1XXX	1000–1999	Assigned	TELNYX LLC	073H	BILLINGS	MT
2016-12-05	406-851-8XXX	8000–8999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	MILES CITY	MT
2016-11-28	406-345-0XXX	0000–0999	Assigned	ONVOY, LLC - MT	453F	GLENDIVE	MT
2016-11-16	406-304-3XXX	3000–3999	Assigned	CHARTER IP ENABLED SERVICES, LLC	792K	MISSOULA	MT
2016-10-27	406-943-3XXX	3000–3999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	SIDNEY	MT
2016-10-26	406-601-1XXX	1000–1999	Assigned	CHARTER IP ENABLED SERVICES, LLC	792K	BILLINGS	MT
2016-10-19	406-361-4XXX	4000–4999	Assigned	WESTERN MONTANA COMMUNITYTEL INC. - MT	986F	HAMILTON	MT
2016-10-19	406-413-5XXX	5000–5999	Assigned	NEW CINGULAR WIRELESS PCS, LLC	6010	BILLINGS	MT
2016-10-19	406-770-0XXX	0000–0999	Assigned	NEW CINGULAR WIRELESS PCS, LLC	6010	GREATFALLS	MT
2016-09-12	406-729-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	WILSALL	MT
2016-08-22	406-708-3XXX	3000–3999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	LEWISTOWN	MT
2016-08-11	406-630-1XXX	1000–1999	Assigned	BANDWIDTH.COM CLEC, LLC - MT	994E	SIDNEY	MT
2016-08-04	406-770-4XXX	4000–4999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	GREATFALLS	MT
2016-07-29	406-344-3XXX	3000–3999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	HAVRE	MT
2016-07-27	406-395-1XXX	1000–1999	Assigned	TRIANGLE TEL. COOP. ASSN., INC.	2257	SOUTHHAVRE	MT
2016-07-25	406-426-9XXX	9000–9999	Assigned	BANDWIDTH.COM CLEC, LLC - MT	994E	RED LODGE	MT
2016-07-20	406-414-9XXX	9000–9999	Assigned	BANDWIDTH.COM CLEC, LLC - MT	994E	BOZEMAN	MT
2016-07-08	406-426-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	RED LODGE	MT
2016-07-08	406-795-4XXX	4000–4999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	WIBAUX	MT
2016-07-08	406-851-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	MILES CITY	MT
2016-07-08	406-943-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SIDNEY	MT
2016-07-07	406-282-5XXX	5000–5999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	MANHATTAN	MT
2016-07-07	406-577-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	BOZEMAN	MT
2016-07-07	406-668-8XXX	8000–8999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	FROMBERG	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.