NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 509-508

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 509-508 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
T-MOBILE USA, INC. 4
BANDWIDTH.COM CLEC, LLC - WA 3
TELNYX LLC 1
LEVEL 3 COMMUNICATIONS, LLC - WA 1
CSC WIRELESS, LLC 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
2021-10-04 509-508-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F SPOKANE WA
2020-11-23 509-508-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F SPOKANE WA
2020-07-23 509-508-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J SPOKANE WA
2020-11-23 509-508-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F SPOKANE WA
2021-02-25 509-508-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2021-11-03 509-508-5XXX 5000–5999Assigned TELNYX LLC 073H SPOKANE WA
2020-12-04 509-508-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SPOKANE WA
2020-12-04 509-508-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SPOKANE WA
2020-09-24 509-508-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SPOKANE WA
2020-09-24 509-508-9XXX 9000–9999Assigned 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.