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
—	307-340	3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	LUSK	WY
—	307-341	not yet reported which blocks →	PROJECT TEL. CO., INC.	2250	SOUTHWYOLA	WY
—	307-342	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - WY	450F	JACKSON	WY
—	307-344	1XXX3XXX4XXX · 2 holders which blocks →	QWEST CORPORATION	9636	MAMMOTH	WY
—	307-345	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	LANDER	WY
—	307-347	not yet reported which blocks →	RT COMMUNICATIONS	3410	WORLAND	WY
—	307-348	not yet reported which blocks →	UNION TEL. CO.	2297	HANNA	WY
—	307-349	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	LANDER	WY
—	307-350	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	ROCK SPG	WY
—	307-351	7XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DOUGLAS	WY
—	307-352	9XXX which blocks →	QWEST CORPORATION	9636	ROCK SPG	WY
—	307-353	not yet reported which blocks →	COLUMBINE TELCO DBA SILVER STAR COMMUNICATIONS	2214	ALTA	WY
—	307-356	not yet reported which blocks →	UNION TEL. CO.	2297	SHIRLEBSIN	WY
—	307-358	not yet reported which blocks →	QWEST CORPORATION	9636	DOUGLAS	WY
—	307-359	4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	DOUGLAS	WY
—	307-360	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	PINEDALE	WY
—	307-362	not yet reported which blocks →	QWEST CORPORATION	9636	ROCK SPG	WY
—	307-366	not yet reported which blocks →	TRI-COUNTY TEL. ASSN., INC.	2296	TEN SLEEP	WY
—	307-367	0XXX which blocks →	CENTURYTEL OF WYOMING, INC. DBA CENTURYLINK	2299	PINEDALE	WY
—	307-370	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	RAWLINS	WY
—	307-371	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	ROCK SPG	WY
—	307-373	2XXX3XXX6XXX · 3 holders which blocks →	BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER]	009E	GREYBULL	WY
—	307-374	0–9 XXXall 10 · 4 holders which blocks →	VONAGE AMERICA LLC	197D	ROCK SPG	WY
—	307-375	not yet reported which blocks →	RT COMMUNICATIONS	3410	WORLAND	WY
—	307-377	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	CASPER	WY
—	307-378	not yet reported which blocks →	UNION TEL. CO.	2297	ROCK RIVER	WY
—	307-379	1XXX which blocks →	CENTURYTEL OF WYOMING, INC. DBA CENTURYLINK	2299	MEDICINBOW	WY
—	307-380	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	BAGGS	WY
—	307-382	not yet reported which blocks →	QWEST CORPORATION	9636	ROCK SPG	WY
—	307-383	not yet reported which blocks →	DUBOIS TEL. EXCH., INC.	2291	BAGGS	WY
—	307-386	not yet reported which blocks →	UNION TEL. CO.	2297	LABARGE	WY
—	307-388	1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	WORLAND	WY
—	307-389	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	ROCK SPG	WY
—	307-390	not yet reported which blocks →	UNION TELEPHONE COMPANY	013B	LABARGE	WY
—	307-401	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	TORRINGTON	WY
—	307-406	not yet reported which blocks →				WY
—	307-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	WY
—	307-417	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - WY	450F	RAWLINS	WY
—	307-421	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CHEYENNE	WY
—	307-422	not yet reported which blocks →	CHUGWATER TEL. CO.	2289	CHUGWATER	WY
—	307-431	3XXX7XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	WORLAND	WY
—	307-432	none assigned yet which blocks →	QWEST CORPORATION	9636	CHEYENNE	WY
—	307-433	3XXX4XXX7XXX · 3 holders which blocks →	QWEST CORPORATION	9636	CHEYENNE	WY
—	307-436	not yet reported which blocks →	QWEST CORPORATION	9636	GLENROCK	WY
—	307-437	not yet reported which blocks →	RT COMMUNICATIONS	3410	MIDWEST	WY
—	307-439	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - WY	9416	CASPER	WY
—	307-440	0XXX1XXX2XXX4XXX · 3 holders which blocks →	BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER]	009E	BASIN	WY
—	307-441	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY	6566	CASPER	WY
—	307-444	not yet reported which blocks →	ALL WEST/WYOMING, INC.	3880	EVANSTON	WY
—	307-449	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ROCK SPG	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.