NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 330-520

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 330-520 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 330 blocks

Most active assignees, all time — NPA 330
BANDWIDTH.COM CLEC, LLC - OH 4
SUPER-NET, INC. - OH 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 1
LEVEL 3 COMMUNICATIONS, LLC - OH 1
IP HORIZON 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
— 330-520-0XXX 0000–0999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 MARSHALLVL OH
— 330-520-1XXX 1000–1999Reserved DOYLESTOWN COMMS, INC. DBA HERITAGE TELCO - OH 849C MARSHALLVL OH
2011-11-28 330-520-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - OH 001F MARSHALLVL OH
2014-06-02 330-520-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - OH 001F MARSHALLVL OH
2007-09-28 330-520-4XXX 4000–4999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - OH 024E MARSHALLVL OH
2012-03-22 330-520-5XXX 5000–5999Assigned SUPER-NET, INC. - OH 155F MARSHALLVL OH
2014-10-27 330-520-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - OH 001F MARSHALLVL OH
2014-01-17 330-520-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MARSHALLVL OH
2015-10-13 330-520-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - OH 001F MARSHALLVL OH
2024-02-07 330-520-9XXX 9000–9999Assigned IP HORIZON LLC 515J MARSHALLVL OH

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.