Network and security tools that respect your privacy
Calculate subnets, look up DNS, check a password against known breaches without revealing it and generate strong passphrases. Everything runs in your browser.
No sign-upPasswords never leave your deviceLogic covered by tests
All tools
Built for sysadmins and for anyone who wants to be safer online.
- Subnet Calculator
Enter an IPv4 address with a prefix, like 192.168.1.10/24, to see the full subnet.
Open → - DNS Lookup
Check what DNS returns for a domain, from two different public resolvers.
Open → - Password Leak Checker
Find out if a password has appeared in known breaches, without sending the password anywhere.
Open → - Passphrase Generator
Create a long random passphrase you can actually remember.
Open → - What Is My IP Address?
Your public IP address, as seen from the internet.
Open →