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
—	406-863	5XXX6XXX7XXX8XXX · 4 holders which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	WHITEFISH	MT
—	406-864	not yet reported which blocks →	BLACKFOOT TEL. COOP., INC.	2235	S ALBERTON	MT
—	406-865	1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	DILLON	MT
—	406-866	0XXX1XXX6XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9636	GREATFALLS	MT
—	406-867	0XXX3XXX5XXX7XXX9XXX · 2 holders which blocks →	WAVENATION, LLC	700J	BILLINGS	MT
—	406-868	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	GREATFALLS	MT
—	406-869	not yet reported which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	4222	BILLINGS	MT
—	406-870	2XXX which blocks →	BANDWIDTH.COM CLEC, LLC - MT	994E	GREATFALLS	MT
—	406-873	0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9636	CUT BANK	MT
—	406-874	none assigned yet which blocks →	MID-RIVERS TELEPHONE COOPERATIVE, INC.	7830	MILES CITY	MT
—	406-875	not yet reported which blocks →	PROJECT TEL. CO., INC.	2250	POMPESPLLR	MT
—	406-876	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BILLINGS	MT
—	406-877	not yet reported which blocks →	RESERVATION TEL. COOP.	1632	WEST BEACH	MT
—	406-880	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	MISSOULA	MT
—	406-881	0XXX1XXX3XXX · 3 holders which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	OLNEY	MT
—	406-882	not yet reported which blocks →	INTERBEL TEL. COOP., INC.	2242	EUREKARURL	MT
—	406-883	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	POLSON	MT
—	406-884	1XXX2XXX4XXX7XXX8XXX · 5 holders which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	POLSON	MT
—	406-885	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	KALISPELL	MT
—	406-886	0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	SWAN LAKE	MT
—	406-887	1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	FINLEY PT	MT
—	406-888	0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9636	W GLACIER	MT
—	406-889	not yet reported which blocks →	INTERBEL TEL. COOP., INC.	2242	EUREKARURL	MT
—	406-890	0–9 XXXall 10 · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	KALISPELL	MT
—	406-891	2XXX4XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BAKER	MT
—	406-892	not yet reported which blocks →	CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK	2249	COLUMBIFLS	MT
—	406-893	none assigned yet which blocks →	NEMONT TEL COOP INC	2247	PEERLESS	MT
—	406-894	0–9 XXXall 10 · 6 holders which blocks →	COMMIO, LLC	939H	BILLINGS	MT
—	406-895	none assigned yet which blocks →	NEMONT TEL COOP INC	2247	OUTLOOK	MT
—	406-896	not yet reported which blocks →	QWEST CORPORATION	9636	BILLINGS	MT
—	406-897	0–9 XXXall 10 · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	COLUMBIFLS	MT
—	406-899	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	GREATFALLS	MT
—	406-911	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MT
—	406-913	1XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	ROUNDUP	MT
—	406-914	3XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	LAMBERT	MT
—	406-915	none assigned yet which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	SO WOLF PT	MT
—	406-920	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BOZEMAN	MT
—	406-922	4XXX7XXX8XXX9XXX · 3 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	4222	BOZEMAN	MT
—	406-923	3XXX8XXX9XXX · 2 holders which blocks →	COMMIO, LLC	939H	GREATFALLS	MT
—	406-925	5XXX6XXX7XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	DILLON	MT
—	406-928	none assigned yet which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	GRASSRANGE	MT
—	406-930	3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BIG TIMBER	MT
—	406-931	1XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BIG TIMBER	MT
—	406-932	7XXX which blocks →	TRIANGLE TEL. COOP. ASSN., INC.	2257	BIG TIMBER	MT
—	406-933	3XXX4XXX which blocks →	QWEST CORPORATION	9636	HELENA	MT
—	406-934	1XXX8XXX · 2 holders which blocks →	WIDE VOICE, LLC - MT	743G	MILES CITY	MT
—	406-935	2XXX3XXX5XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	BROADUS	MT
—	406-937	not yet reported which blocks →	NORTHERN TEL. COOP., INC.	2248	SUNBURST	MT
—	406-938	3XXX7XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	ALZADA	MT
—	406-939	8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT	6564	W GLENDIVE	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.