NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 435-253

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 435-253 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 435 blocks

Most active assignees, all time — NPA 435
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 5
ONVOY, LLC - UT 3
FIRSTDIGITAL TELECOM, LLC - UT 1
CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 435-253-0XXX 0000–0999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 FILLMORE UT
— 435-253-1XXX 1000–1999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 FILLMORE UT
— 435-253-2XXX 2000–2999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 FILLMORE UT
2011-11-15 435-253-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 FILLMORE UT
2020-09-14 435-253-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 FILLMORE UT
2018-10-16 435-253-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E FILLMORE UT
2019-04-08 435-253-6XXX 6000–6999Assigned ONVOY, LLC - UT 871E FILLMORE UT
2019-04-08 435-253-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E FILLMORE UT
2018-08-21 435-253-8XXX 8000–8999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 FILLMORE UT
2019-09-12 435-253-9XXX 9000–9999Assigned CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV 791D FILLMORE UT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.