NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 206-538

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 206-538 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 206 blocks

Most active assignees, all time — NPA 206
T-MOBILE USA, INC. 6
PAETEC ITEL, LLC 1
ONVOY, LLC - WA 1
LEVEL 3 COMMUNICATIONS, LLC - WA 1
ASTOUND BROADBAND, 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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2011-11-23 206-538-0XXX 0000–0999Assigned ASTOUND BROADBAND, LLC - WA 937F SEATTLE WA
2011-12-02 206-538-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2011-10-27 206-538-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2011-12-02 206-538-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2011-12-02 206-538-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2011-10-04 206-538-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SEATTLE WA
2011-11-09 206-538-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E SEATTLE WA
2011-10-17 206-538-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2011-10-17 206-538-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2011-10-17 206-538-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SEATTLE 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.