NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 541-572

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 541-572 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 541 blocks

Most active assignees, all time — NPA 541
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 6
TELNYX LLC 1
TELEPORT COMMUNICATIONS AMERICA, LLC - OR 1
LEVEL 3 COMMUNICATIONS, LLC - OR 1
INTEGRATED PATH COMMUNICATIONS-OREGON, LLC - OR 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
— 541-572-0XXX 0000–0999Reserved ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-572-1XXX 1000–1999Reserved ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-572-2XXX 2000–2999Reserved ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-572-3XXX 3000–3999Reserved ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-572-4XXX 4000–4999Reserved ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-572-5XXX 5000–5999Reserved ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
2019-10-16 541-572-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 MYRTLE PT OR
2018-07-26 541-572-7XXX 7000–7999Assigned INTEGRATED PATH COMMUNICATIONS-OREGON, LLC - OR 826H MYRTLE PT OR
2021-06-15 541-572-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - OR 3234 MYRTLE PT OR
2021-02-26 541-572-9XXX 9000–9999Assigned TELNYX LLC 073H MYRTLE PT OR

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.