Intrusion Shield vs Quad9: side-by-side comparison (2026)
Intrusion Shield is a commercial intrusion detection and prevention systems solution by Intrusion. Quad9 is a free intrusion detection and prevention systems solution. Features, integrations, deployment and the company behind each one, side by side.
KnocknocSponsored
Hi Citrix. Hide VPNs. Hide Windows on a LAN. Knocknoc solves this. Just in time identity linked allow-listing. DIY, on-premise or SaaS. Prevent attacks fast.
Visit
Network threat protection platform blocking malicious IPs using reputation intelligence.
A free DNS recursive service that blocks malicious host names and protects user privacy.
Side-by-side comparison
Feature
Intrusion Shield
Quad9
Pricing model
Commercial
Free
Category
Intrusion Detection and Prevention Systems
Intrusion Detection and Prevention Systems
Deployment and fit
Deployment type
Hybrid
Cloud
Company size fit
SMB, Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Company
Company
Intrusion
–
Use cases and capabilities
Network Protection
Yes
No
Threat Feed
Yes
No
Network Monitoring
Yes
No
Traffic Filtering
Yes
No
IP Address
Yes
No
NDR
Yes
No
Network Visibility
Yes
No
Cyber Threat Intelligence
Yes
No
VPC
Yes
No
Hunting
Yes
No
DNS Security
No
Yes
Core features
9 features listed
10 features listed
Integrations
2 integrations listed
No integrations listed
Need help choosing?
See more solutions in this category, or build a security stack from your picks.
