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
—	608-578	not yet reported which blocks →	SPOK, INC.	6630	MADISON	WI
—	608-582	not yet reported which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	GALESVILLE	WI
—	608-583	0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH INC. - WI	0886	LONE ROCK	WI
—	608-584	not yet reported which blocks →	MARQUETTE-ADAMS TEL. COOP., INC.	0908	BROOKS	WI
—	608-585	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH INC. - WI	0886	ITHACA	WI
—	608-586	not yet reported which blocks →	MARQUETTE-ADAMS TEL. COOP., INC.	0908	OXFORD	WI
—	608-587	not yet reported which blocks →	MARQUETTE-ADAMS TEL. COOP., INC.	0908	ENDEAVOR	WI
—	608-588	0XXX1XXX4XXX5XXX6XXX8XXX · 5 holders which blocks →	FRONTIER NORTH INC. - WI	0886	SPG GREEN	WI
—	608-589	not yet reported which blocks →	MARQUETTE-ADAMS TEL. COOP., INC.	0908	PACKWAUKEE	WI
—	608-592	0XXX8XXX9XXX · 3 holders which blocks →	FRONTIER NORTH INC. - WI	0886	LODI	WI
—	608-596	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	NOAPPLERIV	WI
—	608-603	not yet reported which blocks →	SPOK, INC.	6630	JANESVILLE	WI
—	608-604	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	RICHLD CTR	WI
—	608-606	6XXX7XXX8XXX · 3 holders which blocks →	UNITED STATES CELLULAR - WI	6274	VIROQUA	WI
—	608-611	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	WI
—	608-623	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH INC. - WI	0886	COBB	WI
—	608-624	not yet reported which blocks →	RICHLAND-GRANT TEL. COOP., INC.	0942	SOLDIRSGRV	WI
—	608-625	not yet reported which blocks →	VERNON TEL. COOP.	0966	LA FARGE	WI
—	608-626	not yet reported which blocks →	COCHRANE COOP. TEL. CO.	0866	WAUMANDEE	WI
—	608-627	not yet reported which blocks →	VERNON TEL. COOP.	0966	VIOLA	WI
—	608-629	not yet reported which blocks →	VERNON TEL. COOP.	0966	READSTOWN	WI
—	608-630	0–9 XXXall 10 · 2 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	MADISON	WI
—	608-632	5XXX6XXX7XXX8XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	WESTBY	WI
—	608-634	not yet reported which blocks →	VERNON TEL. COOP.	0966	WESTBY	WI
—	608-635	0XXX5XXX6XXX · 2 holders which blocks →	BRIGHTSPEED OF WESTERN WISCONSIN, LLC	0922	POYNETTE	WI
—	608-637	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF WISCONSIN LLC	0967	VIROQUA	WI
—	608-642	6XXX7XXX8XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	PLATTEVL	WI
—	608-643	9XXX which blocks →	FRONTIER NORTH INC. - WI	0886	SAUK CITY	WI
—	608-644	4XXX5XXX6XXX7XXX · 4 holders which blocks →	FRONTIER NORTH INC. - WI	0886	SAUK CITY	WI
—	608-646	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	PAETEC ITEL, LLC	829J	STOUGHTON	WI
—	608-647	0XXX which blocks →	FRONTIER NORTH INC. - WI	0886	RICHLD CTR	WI
—	608-648	not yet reported which blocks →	VERNON TEL. COOP.	0966	DE SOTO	WI
—	608-654	8XXX9XXX · 2 holders which blocks →	BRIGHTSPEED OF MIDWEST WISCONSIN, LLC	0913	CASHTON	WI
—	608-655	0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH INC. - WI	0886	MARSHALL	WI
—	608-657	not yet reported which blocks →	SPOK, INC.	6630	MADISON	WI
—	608-661	not yet reported which blocks →	TDS METROCOM, LLC	520K	MADISON	WI
—	608-662	not yet reported which blocks →	TDS METROCOM, LLC	520K	MIDDLETON	WI
—	608-663	not yet reported which blocks →	TDS METROCOM, LLC	520K	MADISON	WI
—	608-664	not yet reported which blocks →	TDS METROCOM, LLC	520K	MIDDLETON	WI
—	608-666	4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH INC. - WI	0886	LYNDON STA	WI
—	608-667	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	LA CROSSE	WI
—	608-675	not yet reported which blocks →	VERNON TEL. COOP.	0966	LIBETYPOLE	WI
—	608-676	0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH INC. - WI	0886	CLINTON	WI
—	608-677	0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	NO WARREN	WI
—	608-678	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WISCONDLLS	WI
—	608-685	9XXX which blocks →	TENNEY TEL. CO.	0958	ALMA	WI
—	608-687	not yet reported which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	FOUNTAINCY	WI
—	608-689	not yet reported which blocks →	VERNON TEL. COOP.	0966	GENOA	WI
—	608-692	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-695	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI

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.