Free IT Tools for Professionals
Network utilities, security tools, and developer helpers — no signup required
Network Tools
Subnet Calculator
CIDR, VLSM, IP ranges & network planning
DNS Dumpster
Subdomain discovery & DNS recon
DNS Lookup
Query A, MX, TXT, NS, CNAME records
SSL Checker
Check certificate expiry & details
IP Location
Geolocation, ASN & ISP lookup
MAC Vendor Lookup
Find device manufacturer by MAC
MAC Formatter
Convert MAC address formats
Bulk MAC Formatter
Format multiple MACs at once
Security Tools
Developer Tools