NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 509-973

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 509-973 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
ONVOY, LLC - WA 4
UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 2
TERRA NOVA TELECOM INC. 1
LEVEL 3 COMMUNICATIONS, LLC - WA 1
CENTURYLINK COMMUNICATIONS, 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
— 509-973-0XXX 0000–0999Reserved UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WHITSTRAN WA
2025-06-30 509-973-1XXX 1000–1999Assigned TERRA NOVA TELECOM INC. 145J WHITSTRAN WA
— 509-973-2XXX 2000–2999Reserved UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WHITSTRAN WA
— 509-973-3XXX 3000–3999Reserved LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHITSTRAN WA
— 509-973-4XXX 4000–4999Available WHITSTRAN WA
2020-06-24 509-973-5XXX 5000–5999Assigned ONVOY, LLC - WA 483E WHITSTRAN WA
2014-12-26 509-973-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WHITSTRAN WA
2021-10-25 509-973-7XXX 7000–7999Assigned ONVOY, LLC - WA 483E WHITSTRAN WA
2021-06-01 509-973-8XXX 8000–8999Assigned ONVOY, LLC - WA 483E WHITSTRAN WA
2021-06-01 509-973-9XXX 9000–9999Assigned ONVOY, LLC - WA 483E WHITSTRAN 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.