Recent prefix assignments

5 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 435

UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 4

TDS BROADBAND SERVICE LLC 1

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
—	435-381	not yet reported which blocks →	EMERY TELEPHONE DBA EMERY TELCOM	2278	CASTLEDALE	UT
—	435-383	0–9 XXXall 10 · 8 holders which blocks →	ONVOY, LLC - UT	871E	CEDAR CITY	UT
—	435-384	not yet reported which blocks →	EMERY TELEPHONE DBA EMERY TELCOM	2278	CASTLEDALE	UT
—	435-385	not yet reported which blocks →				UT
—	435-386	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	MINERSVL	UT
—	435-387	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	MILFORD	UT
—	435-406	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	DELTA	UT
—	435-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	UT
—	435-417	not yet reported which blocks →	ONVOY, LLC - UT	871E	NEPHI	UT
—	435-418	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	BEAVER	UT
—	435-419	1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	MONTICELLO	UT
—	435-421	2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	BEAVER	UT
—	435-425	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	BICKNELL	UT
—	435-427	not yet reported which blocks →	CENTRAL UTAH TEL., INC.	2277	FAIRVIEW	UT
—	435-433	not yet reported which blocks →	SKYLINE TELECOM	2283	EUREKA	UT
—	435-435	not yet reported which blocks →				UT
—	435-436	not yet reported which blocks →	SKYLINE TELECOM	2283	MORONI	UT
—	435-438	4XXX which blocks →	QWEST CORPORATION	9636	BEAVER	UT
—	435-439	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	BERYL	UT
—	435-445	not yet reported which blocks →	CENTRAL UTAH TEL., INC.	2277	FOUNTAGREN	UT
—	435-448	not yet reported which blocks →	CENTRAL UTAH TEL., INC.	2277	SCOFIELD	UT
—	435-452	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	BEARRIV CY	UT
—	435-454	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	ALTAMONT	UT
—	435-456	not yet reported which blocks →	BEEHIVE TELEPHONE COMPANY, INC. (UTAH)	4611	CAINEVILLE	UT
—	435-458	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	FIELDING	UT
—	435-459	6XXX7XXX8XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	MONTICELLO	UT
—	435-462	not yet reported which blocks →	CENTRAL UTAH TEL., INC.	2277	MTPLEASANT	UT
—	435-463	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	CEDAR CITY	UT
—	435-467	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	ST GEORGE	UT
—	435-469	9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MTPLEASANT	UT
—	435-471	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	HOWELL	UT
—	435-472	not yet reported which blocks →	CARBON/EMERY TELCOM, INC. - UT	1190	PRICE	UT
—	435-473	not yet reported which blocks →	NORTH COUNTY COMMUNICATIONS CORPORATION - UT	872A	HOWELL	UT
—	435-477	2XXX4XXX6XXX7XXX · 4 holders which blocks →	QWEST CORPORATION	9636	PAROWAN	UT
—	435-487	not yet reported which blocks →	XO UTAH, INC.	7541	PARK CITY	UT
—	435-496	1XXX2XXX4XXX5XXX6XXX7XXX8XXX which blocks →	T-MOBILE USA, INC.	6529	TOOELE	UT
—	435-503	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HEBER CITY	UT
—	435-511	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	UT
—	435-512	not yet reported which blocks →	T-MOBILE USA, INC.	6529	LOGAN	UT
—	435-513	3XXX6XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PARK CITY	UT
—	435-514	0XXX1XXX2XXX3XXX5XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	LOGAN	UT
—	435-518	not yet reported which blocks →	ONVOY, LLC - UT	871E	SALINA	UT
—	435-527	2XXX5XXX6XXX7XXX · 3 holders which blocks →	QWEST CORPORATION	9636	MONROE	UT
—	435-528	not yet reported which blocks →	GUNNISON TEL. CO.	2279	GUNNISON	UT
—	435-529	8XXX which blocks →	QWEST CORPORATION	9636	SALINA	UT
—	435-531	0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CEDAR CITY	UT
—	435-535	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	LOGAN	UT
—	435-542	not yet reported which blocks →	HANKSVILLE TELCOM, INC. - UT	1192	HANKSVILLE	UT
—	435-545	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	RANDLETT	UT
—	435-548	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	FRUITLAND	UT

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.