Technical guides for every NetTools.tech tool — what it does, how it works, how to read the results and how to troubleshoot — plus articles for system administrators, DevOps engineers and security professionals.
Tool guideEmail Tools
How RBL and DNSBL queries work, which lists the NetTools.tech MultiRBL Check queries through its own resolver, what listed, not listed, timeout and provider unavailable mean, and what to do when an IP is listed.
Tool guideWeb & SEO Utilities
How URL shorteners work, how the NetTools.tech URL Shortener checks destinations, creates expiring links without click tracking, and how to delete a link with its token.