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
—	608-297	0XXX1XXX3XXX4XXX5XXX6XXX · 3 holders which blocks →	FRONTIER NORTH INC. - WI	0886	MONTELLO	WI
—	608-298	3XXX5XXX6XXX8XXX · 4 holders which blocks →	WISCONSIN BELL INC	9327	MADISON	WI
—	608-299	4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	PAETEC ITEL, LLC	829J	BELOIT	WI
—	608-301	5XXX6XXX7XXX · 2 holders which blocks →	WISCONSIN BELL INC	9327	MADISON	WI
—	608-302	0XXX1XXX3XXX4XXX5XXX6XXX · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	JANESVILLE	WI
—	608-303	not yet reported which blocks →	SPOK, INC.	6630	MADISON	WI
—	608-304	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	METROPCS, INC.	5562	LA CROSSE	WI
—	608-308	not yet reported which blocks →	TDS METROCOM, LLC	520K	MADISON	WI
—	608-310	4XXX5XXX which blocks →	TDS METROCOM, LLC	520K	MADISON	WI
—	608-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	WI
—	608-312	0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	METROPCS, INC.	5562	BELOIT	WI
—	608-313	2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks →	TDS METROCOM, LLC	520K	BELOIT	WI
—	608-314	4XXX5XXX6XXX7XXX which blocks →	TDS METROCOM, LLC	520K	JANESVILLE	WI
—	608-315	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	TOMAH	WI
—	608-316	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC WI	7216	MADISON	WI
—	608-317	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	LA CROSSE	WI
—	608-320	2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-321	not yet reported which blocks →	TDS METROCOM, LLC	520K	MADISON	WI
—	608-322	1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	JANESVILLE	WI
—	608-323	0XXX5XXX which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	ARCADIA	WI
—	608-324	not yet reported which blocks →	UTELCO, INC.	0963	MONROE	WI
—	608-325	not yet reported which blocks →	UTELCO, INC.	0963	MONROE	WI
—	608-326	not yet reported which blocks →	TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK	1155	PRARIDCHIN	WI
—	608-327	5XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WI	5489	MADISON	WI
—	608-328	not yet reported which blocks →	UTELCO, INC.	0963	MONROE	WI
—	608-329	not yet reported which blocks →	UTELCO, INC.	0963	MONROE	WI
—	608-331	1XXX2XXX3XXX4XXX6XXX8XXX · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	PLATTEVL	WI
—	608-332	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-334	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-335	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-337	8XXX which blocks →	BRIGHTSPEED OF MIDWEST WISCONSIN, LLC	0913	ONTARIO	WI
—	608-338	0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-339	1XXX which blocks →	FRONTIER NORTH INC. - WI	0886	ADAMS	WI
—	608-341	2XXX3XXX5XXX · 3 holders which blocks →	UNITED STATES CELLULAR - WI	6274	DODGEVILLE	WI
—	608-342	not yet reported which blocks →	BRIGHTSPEED OF WESTERN WISCONSIN, LLC	0934	PLATTEVL	WI
—	608-343	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	TOMAH	WI
—	608-344	2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	UNITED STATES CELLULAR - WI	6274	TOMAH	WI
—	608-345	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	MADISON	WI
—	608-346	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	BELOIT	WI
—	608-347	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	MADISON	WI
—	608-348	not yet reported which blocks →	BRIGHTSPEED OF WESTERN WISCONSIN, LLC	0934	PLATTEVL	WI
—	608-349	not yet reported which blocks →	BRIGHTSPEED OF WESTERN WISCONSIN, LLC	0934	PLATTEVL	WI
—	608-354	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC WI	7216	MADISON	WI
—	608-355	not yet reported which blocks →	BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC	0924	BARABOO	WI
—	608-356	not yet reported which blocks →	BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC	0924	BARABOO	WI
—	608-357	not yet reported which blocks →	TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK	1155	PRARIDCHIN	WI
—	608-359	0XXX2XXX4XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	JANESVILLE	WI
—	608-361	8XXX which blocks →	WISCONSIN BELL INC	9327	BELOIT	WI
—	608-362	not yet reported which blocks →	WISCONSIN BELL INC	9327	BELOIT	WI
—	608-363	not yet reported which blocks →	WISCONSIN BELL INC	9327	BELOIT	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.