networking
DNS Dig
Run terminal-style DNS lookups with a cleaner result table.
A / MX / TXT / CAA
DNS workflow links
guide
DNS Dig Troubleshooting Guide
Use dig-style DNS checks to debug website, email, and verification record issues.
opennetworking
CIDR Calculator
Calculate IPv4 network, broadcast, mask, and usable host range from CIDR notation.
opennetworking
IP Lookup
Convert IPv4 or IPv6 addresses into location details and ISP / ASN network provider information.
opensecurity
Security Headers Checker
Paste HTTP response headers to check common browser security protections and weak header values.
open