Network Tools Guides & Tutorials
3 Network Tools guides and tutorials - practical usage, common errors and worked examples.
3 guides in this category
Why WebSocket Will Not Connect: Five Causes, In Order
Connection failures come down to five things - mixed content, Origin mismatch, wrong path, a proxy that drops Upgrade, or an untrusted certificate.
Why Won't a Website Load? Diagnose IP, DNS, Port and Status Code
Diagnose a site that will not load in four layers: IP, DNS, port, HTTP status. Each step has a judgement rule and a cause table, plus WebSocket testing.
How to Test Regular Expressions (Greedy, Groups, ReDoS)
Most regex bugs come from three causes: missing anchors, greedy quantifiers, and catastrophic backtracking. Learn all three plus a pattern cheat sheet.
Tools in this category
Parse IPv4/IPv6, detect public/private/loopback
Open tool →HTTP Status CodesReference for 56 common HTTP status codes, grouped by class with causes and f…
Open tool →UA ParserIdentify browser, OS, device type and engine from UA
Open tool →DNS LookupLook up A, AAAA, CNAME, MX, TXT, NS, SOA, SRV and CAA records, including unde…
Open tool →WebSocket TestConnect to ws/wss endpoints and exchange messages
Open tool →Regex TesterReal-time regex matching with highlight and error hints
Open tool →