Thousands-blocks in 509-866

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 509-866 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

METROPCS, INC. 3

VONAGE AMERICA LLC 1

T-MOBILE USA, INC. 1

ONVOY, LLC - WA 1

LEVEL 3 COMMUNICATIONS, 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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2017-12-14	509-866-0XXX	0000–0999	Assigned	VONAGE AMERICA LLC	197D	SPOKANE	WA
2018-03-21	509-866-1XXX	1000–1999	Assigned	METROPCS, INC.	5562	SPOKANE	WA
2018-03-21	509-866-2XXX	2000–2999	Assigned	METROPCS, INC.	5562	SPOKANE	WA
2018-03-21	509-866-3XXX	3000–3999	Assigned	METROPCS, INC.	5562	SPOKANE	WA
2018-01-12	509-866-4XXX	4000–4999	Assigned	ONVOY, LLC - WA	483E	SPOKANE	WA
2018-05-15	509-866-5XXX	5000–5999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - WA	6121	SPOKANE	WA
2018-07-16	509-866-6XXX	6000–6999	Assigned	BANDWIDTH.COM CLEC, LLC - WA	006F	SPOKANE	WA
2018-09-14	509-866-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SPOKANE	WA
2018-12-21	509-866-8XXX	8000–8999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA	5812	SPOKANE	WA
2020-08-07	509-866-9XXX	9000–9999	Assigned	T-MOBILE USA, INC.	6529	SPOKANE	WA

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.