# Quad9 vs Trellix Intrusion Prevention System: side-by-side comparison (2026)

[Quad9](https://cybersectools.com/tools/quad9) is a free [intrusion detection and prevention systems](https://cybersectools.com/categories/idps) solution. [Trellix Intrusion Prevention System](https://cybersectools.com/tools/trellix-intrusion-prevention-system) is a commercial [intrusion detection and prevention systems](https://cybersectools.com/categories/idps) solution by [Trellix](https://cybersectools.com/companies/trellix). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Quad9 | Trellix Intrusion Prevention System |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Intrusion Detection and Prevention Systems | Intrusion Detection and Prevention Systems |
| Verified | No | No |
| Deployment type | Cloud | Hybrid |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | – | Trellix |
| Headquarters | – | – |

### Use cases and capabilities

| | Quad9 | Trellix Intrusion Prevention System |
|---|---|---|
| DNS Security | Yes | – |
| NDR | – | Yes |
| SSL | – | Yes |
| Signature Based Detection | – | Yes |

### Core features

**Quad9**

10 features listed. Sign in on the page to see them.

**Trellix Intrusion Prevention System**

10 features listed. Sign in on the page to see them.

### Integrations

**Quad9**

No integrations listed.

**Trellix Intrusion Prevention System**

3 integrations listed. Sign in on the page to see them.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Quad9](https://cybersectools.com/tools/quad9) fits if you want a cloud product, you are a startup and you need a free product.
- [Trellix Intrusion Prevention System](https://cybersectools.com/tools/trellix-intrusion-prevention-system) fits if you need both cloud and on-premises options.

## Quad9 vs Trellix Intrusion Prevention System FAQ

Common questions when comparing Quad9 vs Trellix Intrusion Prevention System for intrusion detection and prevention systems.

### What is the difference between Quad9 and Trellix Intrusion Prevention System?

**Quad9**: A free DNS recursive service that blocks malicious host names and protects user privacy.

**Trellix Intrusion Prevention System**: Next-gen IPS detecting & blocking network threats via signatures & behavior. Built by Trellix.

The table above shows where their features, integrations, deployment and company size fit differ.

### Is Quad9 a good alternative to Trellix Intrusion Prevention System?

Often, yes. Quad9 and Trellix Intrusion Prevention System are both Intrusion Detection and Prevention Systems products. Key differences: Quad9 is Free while Trellix Intrusion Prevention System is Commercial. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Quad9 vs BlueCat Edge](https://cybersectools.com/compare/bluecat-edge-vs-quad9)
- [Quad9 vs threatER](https://cybersectools.com/compare/quad9-vs-threater)
- [Quad9 vs Trend Micro TippingPoint Threat Protection System](https://cybersectools.com/compare/quad9-vs-trend-micro-tippingpoint-threat-protection-system)
- [Trellix Intrusion Prevention System vs BlueCat Edge](https://cybersectools.com/compare/bluecat-edge-vs-trellix-intrusion-prevention-system)
- [Trellix Intrusion Prevention System vs threatER](https://cybersectools.com/compare/threater-vs-trellix-intrusion-prevention-system)
- [Trellix Intrusion Prevention System vs Trend Micro TippingPoint Threat Protection System](https://cybersectools.com/compare/trellix-intrusion-prevention-system-vs-trend-micro-tippingpoint-threat-protection-system)

## Alternatives to each

- [See all Quad9 alternatives](https://cybersectools.com/alternatives/quad9)
- [See all Trellix Intrusion Prevention System alternatives](https://cybersectools.com/alternatives/trellix-intrusion-prevention-system)

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Source: https://cybersectools.com/compare/quad9-vs-trellix-intrusion-prevention-system

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/quad9.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Quad9 and Trellix Intrusion Prevention System: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md