NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 217-396

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 217-396 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 217 blocks

Most active assignees, all time — NPA 217
FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 3
ONVOY, LLC 2
PEERLESS NETWORK OF ILLINOIS, LLC - IL 1
MCC TELEPHONY LLC 1
LEVEL 3 COMMUNICATIONS, LLC - IL 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
— 217-396-0XXX 0000–0999Reserved FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 LUDLOW IL
2010-01-21 217-396-1XXX 1000–1999Assigned MCC TELEPHONY LLC 593K LUDLOW IL
2018-09-06 217-396-2XXX 2000–2999Assigned ONVOY, LLC 224C LUDLOW IL
2005-02-24 217-396-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LUDLOW IL
2019-06-06 217-396-4XXX 4000–4999Assigned ONVOY, LLC 224C LUDLOW IL
— 217-396-5XXX 5000–5999Reserved FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 LUDLOW IL
— 217-396-6XXX 6000–6999Available LUDLOW IL
2016-05-10 217-396-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LUDLOW IL
— 217-396-8XXX 8000–8999Reserved FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 LUDLOW IL
2014-12-17 217-396-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E LUDLOW IL

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.