OIS vs SolarWinds IP Scanner: Free Open Source vs Enterprise (2026)

SolarWinds IP Address Manager (IPAM) is a powerful enterprise platform for managing IP address space across large organizations. It's a fundamentally different category of tool compared to Open IP Scanner (OIS). But many sysadmins search for SolarWinds alternatives specifically because their needs are simpler: they just want to quickly see what devices are live on their network. For that use case, OIS delivers the same discovery quality at zero cost and zero complexity.

Quick Comparison

1. Cost: Free vs Enterprise Pricing

SolarWinds IPAM is an enterprise-grade product with pricing that reflects its scope — typically thousands of dollars per year per organization. This makes sense for large enterprises that need to manage IP address pools, DHCP scopes, and DNS zones across hundreds of subnets.

OIS is permanently free and MIT-licensed. There are no tiers, no node limits, no license renewals, and no sales calls. If your need is "scan a subnet and see what's there," you should never pay for that capability.

2. Setup: Seconds vs Days

SolarWinds IPAM requires a dedicated Windows Server with SQL Server, a full application install, and typically several hours (or days) of configuration to scan your environment correctly. It's designed for IT departments maintaining persistent infrastructure.

OIS requires a single PowerShell command:

For quick, ad-hoc scanning needs — incident response, onboarding a new network segment, verifying a change — OIS is ready before SolarWinds would finish its installer.

3. Portability and Zero Footprint

SolarWinds IPAM is a server application. It runs continuously as a service and requires persistent infrastructure. OIS is a single portable .exe that leaves no registry entries, no services, and no background processes. Run it when you need it, done when you close it.

4. Open Source Transparency

OIS is fully open source (MIT). Every line of code is on GitHub. SolarWinds is closed source — and given SolarWinds' 2020 supply chain breach, source code auditability is not an abstract concern for security teams.

5. HTTP Title Scraping and SMB Share Discovery

Despite its enterprise positioning, SolarWinds IPAM does not scrape HTTP titles or enumerate SMB shares. OIS does both automatically. These features are disproportionately useful: one glance at the title column tells you which open port 80 hosts are router UIs, NAS dashboards, or printer admin pages.

When SolarWinds IPAM Is the Right Choice

SolarWinds IPAM is built for a fundamentally different problem: enterprise IP address management at scale. It shines when you need to:

• Manage large IP address pools and subnets across multiple sites
• Integrate with DHCP servers and DNS infrastructure
• Generate compliance and audit reports
• Track IP allocation history and assign IPs to assets
• Set alerts when subnets reach utilization thresholds

If those are your requirements, OIS is not the right tool. But if you're searching for a SolarWinds alternative because you just need to see what's on your LAN right now, OIS is the answer.

Verdict

For quick, reliable, ad-hoc LAN discovery on Windows, OIS offers everything you need at no cost and no complexity. SolarWinds IPAM is a full enterprise platform — justified for organizations with large-scale IP management needs, but substantial overkill for subnet scanning. If you're paying for SolarWinds just to answer "what devices are on my network?", OIS is a zero-cost replacement for that specific workflow.