Free Security Tools
Check emails, IP addresses, VPNs, and domain reputation — instantly and for free. No signup required.
Email Validation Tool
Check if an email address is valid, disposable, or risky. Validates format, MX records, and scans our disposable email database.
Bulk Email Validator
Validate up to 10 email addresses at once. Check format, mail server, and disposable status for your entire list.
IP Address Checker
Look up any IP address for geolocation, threat intelligence, and risk scoring. See country, city, ISP, and security checks.
VPN & Proxy Detector
Check if an IP address is connected through a VPN, proxy, or Tor network. Instant detection with detailed results.
Domain Reputation Checker
Check any domain for MX records, disposable email status, and safety. Verify domain reputation before trusting it.
Why Use These Tools?
Instant Results
No waiting. Enter your query, get results immediately.
No Signup Required
Every tool works without creating an account.
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Backed by Fidro's threat intelligence databases, updated daily.
Need These Checks at Scale?
Every check available in these free tools is also available through Fidro's REST API. Email validation, IP intelligence, VPN detection, and domain reputation — all in one API call.
curl -X POST https://fidro.io/api/validate \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{"email": "user@example.com"}'Browse our disposable email database, compare Fidro to alternatives, or read the blog.
Frequently Asked Questions
Are these tools free?
Yes, all tools are completely free with no signup required. For higher-volume needs, Fidro offers a free API plan with 200 lookups per month.
How do these tools work?
Each tool queries Fidro's threat intelligence databases in real-time, checking against known VPN providers, proxy services, disposable email domains, and malicious IP addresses.
Can I use these tools via API?
Yes. Every check available in these free tools is also available through Fidro's REST API. Sign up for a free API key to get started.
How often is the data updated?
Our threat intelligence databases are updated daily for disposable emails, proxy lists, Tor nodes, and malicious IPs. VPN and datacenter lists are updated weekly.