Category

Parse IPv4/IPv6, detect public/private/loopback

Reference for 56 common HTTP status codes, grouped by class with causes and fixes

Identify browser, OS, device type and engine from UA

Look up A, AAAA, CNAME, MX, TXT, NS, SOA, SRV and CAA records, including underscore names…

Connect to ws/wss endpoints and exchange messages

Real-time regex matching with highlight and error hints