from developers. to developers.
PagesTest is a free toolbox for developers, sysadmins and website owners. Check DNS records and propagation, troubleshoot email authentication, look up IP addresses, inspect SSL certificates, and format or encode data. No sign-up needed.
29 free tools in five groups.
Look up any DNS record, check propagation around the world, and find who controls a domain. More about dns tools
Check MX, SPF, DKIM and DMARC records and work out why mail bounces or lands in spam. More about email tools
Find your public IP, locate any IP address, check DNS blocklists and calculate subnets. More about ip tools
Format JSON, encode and decode Base64, URLs and HTML entities, convert Punycode, and minify code. More about developer tools
Check SSL/TLS certificates, generate strong passwords, test password strength and create hashes. More about security tools
DNS tools query public resolvers such as Google, Cloudflare, Quad9 and OpenDNS at the moment you ask; the propagation checker asks 30 resolvers around the world.
The JSON, Base64, URL and HTML tools, hash and password tools, DKIM generator and subnet calculator run entirely on your device.
No account, no installation. Open a tool on any device and use it straight away.
Server-side lookups are rate-limited per IP address to keep them fast for everyone. Need more? Email [email protected].