Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
2018-10-09	307-487	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	GILLETTE	WY
2018-05-30	307-489	8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SHIRLEBSIN	WY
2018-05-23	307-404	4XXX5XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MEDICINBOW	WY
2018-04-19	307-488	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	LANDER	WY
2018-03-09	307-776	0–9 XXXall 10 · 5 holders which blocks →	VONAGE AMERICA LLC	197D	CASPER	WY
2018-02-20	307-409	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LA GRANGE	WY
2018-02-06	307-204	0–9 XXXall 10 · 2 holders which blocks →	AIRUS, INC. - WY	581H	CODY	WY
2017-08-22	307-238	6XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HAMITNDOME	WY
2017-08-07	307-522	0–9 XXXall 10 · 6 holders which blocks →	AIRUS, INC. - WY	581H	ROCK SPG	WY
2017-05-22	307-317	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - WY	450F	CHEYENNE	WY
2017-04-19	307-785	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - WY	450F	WBLLFOURCH	WY
2017-03-24	307-249	0–9 XXXall 10 · 6 holders which blocks →	TELNYX LLC	073H	JACKSON	WY
2017-02-28	307-999	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	TELNYX LLC	073H	MORAN	WY
2017-02-22	307-888	0–9 XXXall 10 · 5 holders which blocks →	TELNYX LLC	073H	OLDFATHFUL	WY
2016-12-21	307-475	1XXX3XXX6XXX7XXX8XXX · 2 holders which blocks →	TELNYX LLC	073H	CHEYENNE	WY
2016-11-16	307-205	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	LINGLE	WY
2015-12-28	307-226	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	AFTON	WY
2015-11-05	307-239	8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DUBOIS	WY
2015-10-08	307-447	2XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	SARATOGA	WY
2015-08-24	307-414	0–9 XXXall 10 · 6 holders which blocks →	AIRUS, INC. - WY	581H	CHEYENNE	WY
2015-03-26	307-219	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	POWELL	WY
2015-02-17	307-229	2XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	COKEVILLE	WY
2014-12-19	307-209	0–9 XXXall 10 · 8 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	ROCK SPG	WY
2014-11-21	307-829	0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	CHEYENNE	WY
2014-11-21	307-881	0–9 XXXall 10 · 5 holders which blocks →	ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY	268A	WHEATLAND	WY
2014-05-23	307-228	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	GILLETTE	WY
2014-05-23	307-364	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	GREENRIVER	WY
2014-03-24	307-264	0–9 XXXall 10 · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	JACKSON	WY
2013-12-05	307-206	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	LANDER	WY
2013-05-23	307-429	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	SHERIDAN	WY
2012-11-19	307-800	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - WY	450F	KEMMERER	WY
2012-08-01	307-823	0XXX1XXX2XXX3XXX6XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA WY-LLC	879G	CHEYENNE	WY
2012-06-19	307-312	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	WSPEARFISH	WY
2011-05-12	307-448	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	ROCK SPG	WY
2011-03-30	307-425	not yet reported which blocks →	ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY	268A	BUFFALO	WY
2011-01-12	307-338	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	TORRINGTON	WY
2011-01-10	307-369	0–9 XXXall 10 · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CHEYENNE	WY
2011-01-07	307-337	0–9 XXXall 10 · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CASPER	WY
2010-11-24	307-622	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	GILLETTE	WY
2010-08-30	307-363	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	GILLETTE	WY
2010-04-16	307-681	not yet reported which blocks →	ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY	268A	GILLETTE	WY
2009-08-25	307-529	0XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLC - WY	450F	CHEYENNE	WY
2009-07-16	307-343	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	LARAMIE	WY
2008-09-22	307-696	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	GILLETTE	WY
2008-09-05	307-509	0XXX5XXX9XXX · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - WY	081F	CHEYENNE	WY
2008-03-10	307-253	0–9 XXXall 10 · 2 holders which blocks →	QWEST CORPORATION	9636	CASPER	WY
2008-03-03	307-365	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CHEYENNE	WY
2007-12-10	307-854	8XXX which blocks →	ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY	268A	RIVERTON	WY
2007-11-06	307-798	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	ROCK RIVER	WY
2007-06-19	307-438	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	LANDER	WY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.