Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026

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, last 30 days

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 26

Rogers Communications Canada Inc. (Wireless) 23

NEW CINGULAR WIRELESS PCS, LLC - IL 22

ONVOY, LLC - CA 19

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
—	406-259	not yet reported which blocks →	QWEST CORPORATION	9636	BILLINGS	MT
—	406-260	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	KALISPELL	MT
—	406-261	none assigned yet which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	KALISPELL	MT
—	406-262	0XXX6XXX7XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9636	HAVRE	MT
—	406-263	not yet reported which blocks →	SAGEBRUSH CELLULAR, INC.	443B	GLASGOW	MT
—	406-264	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	FORT SHAW	MT
—	406-265	not yet reported which blocks →	QWEST CORPORATION	9636	HAVRE	MT
—	406-266	0XXX1XXX6XXX7XXX · 3 holders which blocks →	QWEST CORPORATION	9636	TOWNSEND	MT
—	406-267	not yet reported which blocks →	SOUTHERN MONTANA TEL. CO.	2254	DIVIDE	MT
—	406-268	4XXX5XXX · 2 holders which blocks →	QWEST CORPORATION	9636	GREATFALLS	MT
—	406-270	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	KALISPELL	MT
—	406-271	6XXX which blocks →	3 RIVERS TELEPHONE COOPERATIVE, INC. - MT	3924	CONRAD	MT
—	406-272	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLC - MT	453F	BILLINGS	MT
—	406-273	1XXX8XXX which blocks →	QWEST CORPORATION	9636	MISSOULA	MT
—	406-274	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks →	TELEPORT COMMUNICATIONS AMERICA MT - LLC	771G	MISSOULA	MT
—	406-275	not yet reported which blocks →	RONAN TEL. CO.	2252	PABLO	MT
—	406-276	none assigned yet which blocks →	3 RIVERS TEL. COOP., INC.	2255	LIMA	MT
—	406-277	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	BELT	MT
—	406-278	1XXX2XXX6XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9636	CONRAD	MT
—	406-279	not yet reported which blocks →	3 RIVERS TEL. COOP., INC.	2255	VALIER	MT
—	406-281	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA MT - LLC	771G	BILLINGS	MT
—	406-282	0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9636	MANHATTAN	MT
—	406-283	0XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks →	ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER	4322	LIBBY	MT
—	406-284	0XXX1XXX2XXX5XXX7XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9636	MANHATTAN	MT
—	406-285	1XXX2XXX7XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9636	THREEFORKS	MT
—	406-286	none assigned yet which blocks →	NEMONT TEL COOP INC	2247	RESERVE	MT
—	406-287	0XXX1XXX4XXX6XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9636	WHITEHALL	MT
—	406-288	not yet reported which blocks →	BLACKFOOT TEL. COOP., INC.	2235	DRUMMOND	MT
—	406-289	1XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CONRAD	MT
—	406-291	8XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	LIBBY	MT
—	406-292	2XXX which blocks →	TRIANGLE TEL. COOP. ASSN., INC.	2257	JOPLIN	MT
—	406-293	none assigned yet which blocks →	ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER	4322	LIBBY	MT
—	406-294	not yet reported which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	4222	BILLINGS	MT
—	406-295	0XXX1XXX2XXX3XXX6XXX8XXX · 2 holders which blocks →	ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER	4322	TROY	MT
—	406-296	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER	4322	EUREKA	MT
—	406-297	not yet reported which blocks →	INTERBEL TELEPHONE COOPERATIVE, INC. - MT	3959	EUREKARURL	MT
—	406-298	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	COLUMBUS	MT
—	406-310	0–9 XXXall 10 · 5 holders which blocks →	BLACKFOOT COMMUNICATIONS, INC. - MT	7870	BUTTE	MT
—	406-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MT
—	406-312	1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	NUSO, LLC	478J	BOZEMAN	MT
—	406-315	0–9 XXXall 10 · 4 holders which blocks →	SAGEBRUSH CELLULAR, INC.	443B	GREATFALLS	MT
—	406-317	0–9 XXXall 10 · 6 holders which blocks →	TELNYX LLC	073H	MISSOULA	MT
—	406-319	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	POLSON	MT
—	406-320	3XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	ROUNDUP	MT
—	406-321	5XXX6XXX7XXX8XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	COLUMBUS	MT
—	406-322	2XXX3XXX7XXX · 2 holders which blocks →	QWEST CORPORATION	9636	COLUMBUS	MT
—	406-323	none assigned yet which blocks →	MID-RIVERS TEL. COOP., INC.	2246	ROUNDUP	MT
—	406-324	0XXX7XXX8XXX9XXX · 3 holders which blocks →	QWEST CORPORATION	9636	HELENA	MT
—	406-325	0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	NUSO, LLC	732J	BILLINGS	MT
—	406-326	not yet reported which blocks →	TRIANGLE TEL. COOP. ASSN., INC.	2257	REEDPOINT	MT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.