NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 509-433

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 509-433 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 509 blocks

Most active assignees, all time — NPA 509
NEW CINGULAR WIRELESS PCS, LLC 5
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 2
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 1
T-MOBILE USA, INC. 1
BANDWIDTH.COM CLEC, LLC - WA 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
2020-04-02 509-433-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
— 509-433-1XXX 1000–1999Reserved NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
2025-11-14 509-433-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
2015-10-12 509-433-3XXX 3000–3999Assigned ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-433-4XXX 4000–4999Reserved NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
2020-04-02 509-433-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
2023-07-26 509-433-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
2009-01-05 509-433-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F WENATCHEE WA
2008-11-10 509-433-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
2021-05-07 509-433-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WENATCHEE WA

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.