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
—	608-478	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WI	5489	SUNPRAIRIE	WI
—	608-483	not yet reported which blocks →	COON VALLEY FARMERS TEL. CO.	0868	CHASEBURG	WI
—	608-486	0XXX3XXX7XXX9XXX · 3 holders which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	BANGOR	WI
—	608-488	not yet reported which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	MELROSE	WI
—	608-489	not yet reported which blocks →	HILLSBORO TEL. CO., INC.	0892	HILLSBORO	WI
—	608-493	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH INC. - WI	0886	MERRIMAC	WI
—	608-494	5XXX6XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MONTELLO	WI
—	608-504	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - WI	225C	MADISON	WI
—	608-511	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	WI
—	608-512	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WI	5489	MADISON	WI
—	608-513	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	MADISON	WI
—	608-516	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	MADISON	WI
—	608-522	not yet reported which blocks →	BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC	0924	NO FREEDOM	WI
—	608-523	2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks →	UTELCO, INC.	0963	BLANCHADVL	WI
—	608-524	not yet reported which blocks →	FRONTIER NORTH INC. - WI	0886	REEDSBURG	WI
—	608-525	0XXX which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	ETTRICK	WI
—	608-526	not yet reported which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	HOLMEN	WI
—	608-527	0XXX9XXX which blocks →	MT. VERNON TEL. CO.	0917	NEW GLARUS	WI
—	608-528	not yet reported which blocks →	VERNON TEL. COOP.	0966	YUBA	WI
—	608-531	7XXX8XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	JANESVILLE	WI
—	608-532	3XXX7XXX8XXX · 3 holders which blocks →	BRIGHTSPEED OF WESTERN WISCONSIN, LLC	0922	AVOCA	WI
—	608-533	not yet reported which blocks →	GRANTLAND TELECOM, INC.	0930	WOODMAN	WI
—	608-534	0XXX2XXX3XXX4XXX9XXX · 4 holders which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	TREMPEALEU	WI
—	608-536	not yet reported which blocks →	RICHLAND-GRANT TEL. COOP., INC.	0942	BOAZ	WI
—	608-537	not yet reported which blocks →	RICHLAND-GRANT TEL. COOP., INC.	0942	BLUE RIVER	WI
—	608-538	not yet reported which blocks →	RICHLAND-GRANT TEL. COOP., INC.	0942	SABIN	WI
—	608-539	not yet reported which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	CENTERVL	WI
—	608-542	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CAMPDOUGLS	WI
—	608-543	1XXX2XXX7XXX · 3 holders which blocks →	BRIGHTSPEED OF CENTRAL WISCONSIN, LLC	1159	ARGYLE	WI
—	608-544	0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH INC. - WI	0886	WITWEN	WI
—	608-546	0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH INC. - WI	0886	PLAIN	WI
—	608-547	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	MAUSTON	WI
—	608-548	9XXX which blocks →	UNITED STATES CELLULAR - WI	6274	MAUSTON	WI
—	608-549	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH INC. - WI	0886	BLOOM CITY	WI
—	608-550	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	MADISON	WI
—	608-551	0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 7 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	BRODHEAD	WI
—	608-552	0XXX1XXX5XXX6XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CAMPDOUGLS	WI
—	608-553	6XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	DODGEVILLE	WI
—	608-555	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	WI
—	608-556	1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MADISON	WI
—	608-558	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	MONROE	WI
—	608-559	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	MADISON	WI
—	608-562	not yet reported which blocks →	LEMONWEIR VALLEY TEL. CO.	0900	NEW LISBON	WI
—	608-564	0XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	FRONTIER NORTH INC. - WI	0886	MONROE CTR	WI
—	608-565	8XXX which blocks →	CENTRAL STATE TEL. CO	0859	NECEDAH	WI
—	608-568	4XXX5XXX6XXX8XXX · 4 holders which blocks →	DICKEYVILLE TEL. CORP.	0875	DICKEYVL	WI
—	608-572	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI	6508	MADISON	WI
—	608-574	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	DODGEVILLE	WI
—	608-575	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	MADISON	WI
—	608-576	none assigned yet which blocks →	UNITED STATES CELLULAR - WI	6274	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.