viele infodienste z.B. reverse dns und freunde
OpenNIC (a.k.a. “The OpenNIC Projectâ€) is an organization of dedicated volunteers who run an alternative DNS network. OpenNIC is owned and operated by the OpenNIC community. Membership is open to all who share an interest in keeping DNS free for all users
ServerSniff.net - Your free “Swiss Army Knife†for networking, serverchecks and routing with many many little toys and tools for administrators, webmasters, developers, powerusers und security-aware users.
sshfp generates DNS SSHFP records from SSH public keys. sshfp can take public keys from a known_hosts file or from scanning the host's sshd daemon.
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