Free Online Tools
Network diagnostics, developer utilities, and security checkers — all free and running server-side or in your browser.
Download Speed Test
Test your download speed from FastDDL's server.
Traceroute with GeoIP
Trace the route packets take to any host, with country flags, ISP and ASN for every hop. Inspired by NirSoft's CountryTraceRoute.
SSL / TLS Certificate Checker
Inspect the SSL certificate for any HTTPS host — issuer, validity, SANs, and chain of trust.
Advanced DNS Lookup
Query all DNS record types for any domain — A, AAAA, MX, NS, TXT, CNAME, SOA, SRV, CAA. Powered by dig.
Base64 Encode / Decode
Convert text to Base64 or decode Base64 back to text. All processing happens in your browser.
Subnet / CIDR Calculator
Calculate network address, broadcast, usable hosts, and subnet mask from a CIDR range. All in your browser.
Regex Tester
Test regular expressions against any text with live matching. All in your browser using JavaScript RegExp engine.
MAC Address Vendor Lookup
Look up the manufacturer of any MAC address using the IEEE OUI database. Inspired by NirSoft's MACAddressView.
IP Info Checker
Look up geolocation, ISP, ASN, and connection details for any IP address.
Proxy / VPN Detector
Check if an IP address is a proxy, VPN, or hosting IP.
WHOIS Domain Lookup
Query WHOIS records for any domain — registrar, creation date, expiry, nameservers.
SMTP Server Check
Test if a mail server accepts connections on port 25.
MX Record Lookup
Find mail exchange (MX) records for any domain.
Free Proxy List
Live feed of working HTTP proxies from public sources.