Recent prefix assignments

5 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 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
—	435-211	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	UT
—	435-213	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	LOGAN	UT
—	435-214	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	PARK CITY	UT
—	435-215	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	ST GEORGE	UT
—	435-216	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	ST GEORGE	UT
—	435-220	2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MOAB	UT
—	435-221	1XXX4XXX6XXX8XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	BEAVER	UT
—	435-229	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	ST GEORGE	UT
—	435-230	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	BEARRIV CY	UT
—	435-231	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	ENTERPRISE	UT
—	435-232	0XXX5XXX7XXX8XXX which blocks →	T-MOBILE USA, INC.	6529	LOGAN	UT
—	435-234	not yet reported which blocks →	BEEHIVE TELEPHONE COMPANY, INC. (UTAH)	4611	IBAPAH	UT
—	435-237	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	BRIGHAM CY	UT
—	435-238	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - UT	871E	CEDAR CITY	UT
—	435-240	1XXX3XXX8XXX · 2 holders which blocks →	COMMIO, LLC	939H	WENDOVER	UT
—	435-241	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	T-MOBILE USA, INC.	6529	TOOELE	UT
—	435-242	2XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	METROPCS, INC.	5562	GREENRIVER	UT
—	435-245	1XXX8XXX · 2 holders which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-246	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - UT	871E	BRIGHAM CY	UT
—	435-247	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	LAPOINT	UT
—	435-250	0XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - UT	117F	NEPHI	UT
—	435-256	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - UT	871E	ST GEORGE	UT
—	435-257	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	TREMONTON	UT
—	435-258	6XXX7XXX8XXX9XXX · 3 holders which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-259	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	MOAB	UT
—	435-260	3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	MOAB	UT
—	435-261	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - UT	117F	BEAVER	UT
—	435-267	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CEDAR CITY	UT
—	435-272	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - UT	117F	ST GEORGE	UT
—	435-276	0XXX2XXX6XXX7XXX8XXX · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	BLANDING	UT
—	435-279	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	BEARRIV CY	UT
—	435-283	not yet reported which blocks →	MANTI TEL. CO.	2282	EPHRAIM	UT
—	435-285	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	THOMPSON	UT
—	435-286	not yet reported which blocks →	EMERY TELEPHONE DBA EMERY TELCOM	2278	CASTLEDALE	UT
—	435-294	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	LOGAN	UT
—	435-300	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	KAMAS	UT
—	435-301	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	ST GEORGE	UT
—	435-304	2XXX6XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	RICHFIELD	UT
—	435-307	not yet reported which blocks →				UT
—	435-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	UT
—	435-324	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - UT	871E	HEBER CITY	UT
—	435-326	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	MARYSVALE	UT
—	435-335	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	BOULDER	UT
—	435-338	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	TOOELE	UT
—	435-340	2XXX6XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	EPHRAIM	UT
—	435-347	not yet reported which blocks →				UT
—	435-349	not yet reported which blocks →				UT
—	435-353	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	NEOLA	UT
—	435-359	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - UT	871E	ST GEORGE	UT
—	435-363	2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	LOGAN	UT

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.