NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 435-419

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 435-419 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
ONVOY, LLC - UT 6
TELEPORT COMMUNICATIONS AMERICA, LLC - UT 1
FIRSTDIGITAL TELECOM, LLC - UT 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 1
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 435-419-0XXX 0000–0999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MONTICELLO UT
2020-11-20 435-419-1XXX 1000–1999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2019-04-23 435-419-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2019-04-23 435-419-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2018-10-16 435-419-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2020-07-09 435-419-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2020-10-22 435-419-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 MONTICELLO UT
2020-11-20 435-419-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
— 435-419-8XXX 8000–8999Available MONTICELLO UT
2017-12-05 435-419-9XXX 9000–9999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 MONTICELLO UT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.