Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 — NPA 307

UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 2

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
2007-05-22	307-426	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CHEYENNE	WY
2007-05-11	307-315	0–9 XXXall 10 · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CASPER	WY
2007-03-14	307-481	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - WY	450F	LUSK	WY
2006-12-05	307-533	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	SHERIDAN	WY
2006-09-08	307-309	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	GLENROCK	WY
2006-06-21	307-392	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	BORDER	WY
2006-05-23	307-287	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CHEYENNE	WY
2006-04-13	307-251	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CASPER	WY
2006-03-20	307-316	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - WY	450F	CHEYENNE	WY
2005-06-22	307-774	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	JACKSON	WY
2005-06-22	307-880	not yet reported which blocks →	GOLD STAR COMMUNICATIONS, LLC	340D	FREEDOM	WY
2005-06-22	307-887	not yet reported which blocks →	GOLD STAR COMMUNICATIONS, LLC	340D	AFTON	WY
2005-06-15	307-480	0XXX1XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	THERMOPOLS	WY
2005-04-01	307-586	not yet reported which blocks →	TRI TEL, INC.	7466	CODY	WY
2005-04-01	307-764	not yet reported which blocks →	TRI TEL, INC.	7466	POWELL	WY
2005-03-14	307-391	0XXX1XXX2XXX6XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MOORCROFT	WY
2005-01-12	307-275	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CHEYENNE	WY
2004-12-21	307-629	0XXX1XXX2XXX4XXX6XXX8XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	NEWCASTLE	WY
2004-07-14	307-274	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CHEYENNE	WY
2004-05-26	307-271	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	POWELL	WY
2004-05-24	307-688	not yet reported which blocks →	QWEST CORPORATION	9636	GILLETTE	WY
2004-05-19	307-257	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	GILLETTE	WY
2004-05-19	307-278	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	BUFFALO	WY
2004-05-19	307-288	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	EVANSTON	WY
2004-05-19	307-298	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	DOUGLAS	WY
2004-01-19	307-286	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CHEYENNE	WY
2004-01-05	307-256	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	CHEYENNE	WY
2003-12-18	307-790	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	SUNDANCE	WY
2003-10-21	307-299	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	GILLETTE	WY
2003-10-20	307-749	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	PINEDALE	WY
2003-10-20	307-759	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	LUSK	WY
2003-10-20	307-779	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	WHEATLAND	WY
2003-09-11	307-254	6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	POWELL	WY
2003-08-21	307-277	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CASPER	WY
2003-06-26	307-707	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	GREENRIVER	WY
2003-06-16	307-705	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	ROCK SPG	WY
2003-06-16	307-708	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	EVANSTON	WY
2003-06-16	307-709	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	RIVERTON	WY
2003-06-16	307-710	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	RAWLINS	WY
2003-06-16	307-713	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	JACKSON	WY
2003-06-16	307-714	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	LANDER	WY
2003-06-16	307-723	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	KEMMERER	WY
2003-06-16	307-724	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	CASPER	WY
2003-06-16	307-747	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	MT VIEW	WY
2003-03-25	307-248	4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	AFTON	WY
2003-01-30	307-675	not yet reported which blocks →	ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY	268A	SHERIDAN	WY
2003-01-21	307-202	4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	POWELL	WY
2003-01-07	307-201	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	JACKSON	WY
2003-01-06	307-214	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CHEYENNE	WY
2002-12-27	307-701	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	CHEYENNE	WY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.