NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 570-355

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 570-355 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 570 blocks

Most active assignees, all time — NPA 570
LEVEL 3 COMMUNICATIONS, LLC - PA 3
COMMONWEALTH TELEPHONE COMPANY LLC 3
TELEPORT COMMUNICATIONS AMERICA, LLC - PA 1
IDT AMERICA, CORP. - PA 1
CORE COMMUNICATIONS, INC. - PA 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
— 570-355-0XXX 0000–0999Reserved COMMONWEALTH TELEPHONE COMPANY LLC 0161 POCONOLAKE PA
2013-07-01 570-355-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 POCONOLAKE PA
— 570-355-2XXX 2000–2999Reserved COMMONWEALTH TELEPHONE COMPANY LLC 0161 POCONOLAKE PA
2016-02-22 570-355-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7309 POCONOLAKE PA
2008-09-26 570-355-4XXX 4000–4999Assigned IDT AMERICA, CORP. - PA 213C POCONOLAKE PA
2007-07-31 570-355-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 POCONOLAKE PA
2009-03-13 570-355-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 POCONOLAKE PA
2015-05-27 570-355-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 POCONOLAKE PA
2016-01-04 570-355-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J POCONOLAKE PA
— 570-355-9XXX 9000–9999Reserved COMMONWEALTH TELEPHONE COMPANY LLC 0161 POCONOLAKE PA

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.