Free security tools
All of Cactus's security tools
Every Cactus checker in one place, grouped by what you're trying to do. All free, no signup, and bilingual - pick a tool to get a clear, plain-language result.
Did you get something suspicious?
Link check
Is this link safe? Paste it and see.
QR code check
See where a QR code really leads.
Phishing email check
Check a suspicious email for phishing.
Scam text check
Spot the scam signs in a text message.
Batch check
Scan up to 20 links at once.
File hash / malware check
Check a file hash for known malware.
Is a website or domain set up safely?
SSL/TLS check
Grade a site's HTTPS from A+ to F.
Email auth (SPF/DKIM/DMARC)
Can scammers spoof a domain's email?
SPF & DMARC record builder
Build the DNS records that stop spoofing.
Security headers
Grade a website's security headers.
Look-alike (typosquat) domains
Find look-alikes impersonating a domain.
Certificate logs & subdomains
Discover a domain's hidden subdomains.
WHOIS / domain age
Who owns a domain, and how old is it?
DNS lookup
A domain's DNS records at a glance.
IP reputation
Is an IP on spam or abuse blocklists?
Subnet calculator
Network, broadcast, and host range from a CIDR.
What is my IP?
See your public IP and what it reveals about you.