Network & Server Tools

Everyday reference, arithmetic and checking for people who run servers — look up a DNS record, read the certificate a host is really serving, count what your SPF record costs in DNS lookups, follow a redirect chain header by header, work out a subnet, or hash a password for an .htpasswd file. Two kinds of tool sit here, and the difference matters: the calculators and hash generators run entirely on your own machine and send nothing anywhere, while the checkers cannot — a browser has no way to query DNS or read a certificate, so those send the domain you type to our server, which looks up the public record. Every one of them says which it is, on its own page.

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