The dnsutl package is a collection tools to make administering DNS easier. These include reverse map generation, validation, and much more. All of these programs are robust when faced with all the peculiar semantics of DNS resource files.
gh-tool is a command-line interface to gethostby*, in libresolv/libc. It allows one to check
the local system's notion of an IP->DNS or DNS->IP mapping, including aliases, directly,
rather than digging for mappings in DNS, which may not pertain.
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