Recent prefix assignments

0 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, all time — NPA 435

CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 28

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
—	435-207	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	TREMONTON	UT
—	435-257	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	TREMONTON	UT
—	435-259	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	MOAB	UT
—	435-279	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	BEARRIV CY	UT
—	435-285	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	THOMPSON	UT
—	435-452	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	BEARRIV CY	UT
—	435-458	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	FIELDING	UT
—	435-471	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	HOWELL	UT
—	435-587	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	MONTICELLO	UT
—	435-672	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	BLUFF	UT
—	435-678	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	BLANDING	UT
—	435-683	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	MEXICANHAT	UT
—	435-684	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	LAKEPOWELL	UT
—	435-686	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	LA SAL	UT
—	435-692	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	NAT BRIDGE	UT
—	435-719	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	MOAB	UT
—	435-743	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	FILLMORE	UT
—	435-758	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	SCIPIO	UT
—	435-759	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	KANOSH	UT
—	435-795	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	HOLDEN	UT
—	435-842	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	MEADOW	UT
—	435-846	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	OAK CITY	UT
—	435-854	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	THATCHER	UT
—	435-857	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	LYNNDYL	UT
—	435-863	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	PROMONTORY	UT
—	435-864	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	DELTA	UT
—	435-866	6XXX7XXX8XXX · 2 holders which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	PORTAGE	UT
—	435-872	none assigned yet which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	SNOWVILLE	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.