Web & Server

Generate config files like .htaccess and calculate IP and domain values

Generate files such as .htaccess, .htpasswd, security.txt and llms.txt or DMARC records, create CSRs and self-signed certificates, and inspect SSL certificates. There are also a CIDR calculator and an IPv4 to IPv6 converter. Certificates and keys never leave your browser.

CIDR CalculatorIP ranges and subnet masks CSR DecoderCheck a CSR before you submit it DMARC GeneratorBuild your _dmarc TXT record .htaccess GeneratorApache redirects, caching and more Htpasswd GeneratorBasic auth passwords for Apache IPv4 to IPv6IPv4-mapped, 6to4 and NAT64 forms llms.txt GeneratorMake an llms.txt for AI tools security.txt GeneratorPublish a vulnerability contact CSR & Certificate GeneratorMake a key, CSR and test certificate Certificate Key MatcherDoes this key belong to the cert?Certificate DecoderRead certificate details and chain order SSL ConverterConvert PEM, DER, PFX and P7B Bulk URL OpenerOpen a list of links in new tabs