NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 412-587

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 412-587 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
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 4
AERIAL COMMUNICATIONS, INC. 3
NEW CINGULAR WIRELESS PCS, LLC - IL 1
CORE COMMUNICATIONS, INC. - PA 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
— 412-587-0XXX 0000–0999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PTTSBGZON7 PA
2007-12-11 412-587-1XXX 1000–1999Assigned AERIAL COMMUNICATIONS, INC. 6701 PTTSBGZON7 PA
2008-10-31 412-587-2XXX 2000–2999Assigned AERIAL COMMUNICATIONS, INC. 6701 PTTSBGZON7 PA
2009-03-25 412-587-3XXX 3000–3999Assigned AERIAL COMMUNICATIONS, INC. 6701 PTTSBGZON7 PA
— 412-587-4XXX 4000–4999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PTTSBGZON7 PA
— 412-587-5XXX 5000–5999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PTTSBGZON7 PA
— 412-587-6XXX 6000–6999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PTTSBGZON7 PA
2018-06-20 412-587-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PTTSBGZON7 PA
2018-10-12 412-587-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON7 PA
2025-10-22 412-587-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PTTSBGZON7 PA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.