NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 412-564

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 412-564 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 412 blocks

Most active assignees, all time — NPA 412
LEVEL 3 COMMUNICATIONS, LLC - PA 3
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2
BANDWIDTH.COM CLEC, LLC - PA 2
IP HORIZON LLC 1
COMCAST IP PHONE, 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
2005-01-29 412-564-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 PTGSBNZN13 PA
2005-01-29 412-564-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 PTGSBNZN13 PA
2009-03-03 412-564-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PTGSBNZN13 PA
2014-03-20 412-564-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F PTGSBNZN13 PA
— 412-564-4XXX 4000–4999Reserved LEVEL 3 COMMUNICATIONS, LLC - PA 4007 PTGSBNZN13 PA
2006-09-18 412-564-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PTGSBNZN13 PA
2016-07-20 412-564-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F PTGSBNZN13 PA
2015-05-19 412-564-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PTGSBNZN13 PA
2015-03-03 412-564-8XXX 8000–8999Assigned IP HORIZON LLC 515J PTGSBNZN13 PA
2003-10-24 412-564-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PTGSBNZN13 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.