Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 406

QWEST CORPORATION 132

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 119

NEW CINGULAR WIRELESS PCS, LLC 74

ONVOY, LLC - MT 43

TRIANGLE TEL. COOP. ASSN., INC. 39

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 NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
—	406-689	not yet reported which blocks →	SOUTHERN MONTANA TEL. CO.	2254	WISDOM	MT
—	406-690	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BILLINGS	MT
—	406-691	4XXX7XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ANACONDA	MT
—	406-693	0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9636	WARM SPG	MT
—	406-695	none assigned yet which blocks →	NEMONT TEL COOP INC	2247	FRAZER	MT
—	406-698	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BILLINGS	MT
—	406-699	1XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HARDIN	MT
—	406-700	not yet reported which blocks →				MT
—	406-707	0XXX5XXX6XXX7XXX · 4 holders which blocks →	TERRA NOVA TELECOM INC.	145J	LEWISTOWN	MT
—	406-709	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	LAKESIDE	MT
—	406-711	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MT
—	406-718	1XXX4XXX7XXX8XXX · 3 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	DARBY	MT
—	406-719	0–9 XXXall 10 · 4 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	FROMBERG	MT
—	406-720	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	COLSTRIP	MT
—	406-721	not yet reported which blocks →	QWEST CORPORATION	9636	MISSOULA	MT
—	406-722	7XXX which blocks →	BLACKFOOT TEL. COOP., INC.	2235	ALBERTON	MT
—	406-723	not yet reported which blocks →	QWEST CORPORATION	9636	BUTTE	MT
—	406-724	none assigned yet which blocks →	NEMONT TEL COOP INC	2247	GLENTANA	MT
—	406-725	not yet reported which blocks →	NEMONT TEL COOP INC	2247	LARSLAN	MT
—	406-726	0XXX1XXX2XXX · 2 holders which blocks →	BLACKFOOT TEL. COOP., INC.	2235	ARLEE	MT
—	406-727	not yet reported which blocks →	QWEST CORPORATION	9636	GREATFALLS	MT
—	406-728	not yet reported which blocks →	QWEST CORPORATION	9636	MISSOULA	MT
—	406-730	0–9 XXXall 10 · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	WHITEFISH	MT
—	406-731	0XXX8XXX · 2 holders which blocks →	WAVENATION, LLC	700J	GREATFALLS	MT
—	406-732	0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9636	ST MARY	MT
—	406-733	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	HIGHWOOD	MT
—	406-734	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	CARTER	MT
—	406-735	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	GEYSER	MT
—	406-736	2XXX which blocks →	3 RIVERS TEL. COOP., INC.	2255	STOCKETT	MT
—	406-737	not yet reported which blocks →	TRIANGLE TEL. COOP. ASSN., INC.	3310	GERALDINE	MT
—	406-738	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	RAYNESFORD	MT
—	406-739	not yet reported which blocks →	TRIANGLE TEL. COOP. ASSN., INC.	2257	LOMA	MT
—	406-740	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	COLSTRIP	MT
—	406-741	not yet reported which blocks →	HOT SPRINGS TEL. CO.	2241	HOTSPRINGS	MT
—	406-742	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks →	MID-RIVERS TELEPHONE COOPERATIVE, INC.	7830	FAIRVIEW	MT
—	406-745	none assigned yet which blocks →	BLACKFOOT TEL. COOP., INC.	2235	STIGNATIUS	MT
—	406-746	not yet reported which blocks →	NEMONT TEL COOP INC	2247	NASHUA	MT
—	406-747	0XXX2XXX4XXX6XXX7XXX8XXX which blocks →	QWEST CORPORATION	9636	FAIRVIEW	MT
—	406-748	0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	QWEST CORPORATION	9636	COLSTRIP	MT
—	406-749	2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	COLSTRIP	MT
—	406-751	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	KALISPELL	MT
—	406-752	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	KALISPELL	MT
—	406-753	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	BRADY	MT
—	406-754	not yet reported which blocks →	BLACKFOOT TEL. COOP., INC.	2235	CONDON	MT
—	406-755	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	KALISPELL	MT
—	406-756	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	KALISPELL	MT
—	406-757	7XXX which blocks →	RANGE TEL COOP INC	2251	DECKER	MT
—	406-758	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	KALISPELL	MT
—	406-759	2XXX9XXX · 2 holders which blocks →	TRIANGLE TEL. COOP. ASSN., INC.	2257	CHESTER	MT
—	406-760	0XXX2XXX3XXX4XXX8XXX · 3 holders which blocks →	VONAGE AMERICA LLC	197D	GREATFALLS	MT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.