go to
> host(1)
> getaddrinfo(3)
> getnameinfo(3)
> resolv.conf(5)
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man page of addr2name

addr2name: perform DNS lookups from scripts


addr2name, name2addr - perform DNS lookups from scripts


addr2name [-46cmnr] [HOSTNAMES] name2addr [-46cn] [HOSTNAMES]


Write addresses or canonical hostname of specified names to the standard output. If no names are specified via the command line, they are read from the standard input.


-4 or --ipv4 Only try to perform IPv4 lookups. -6 or --ipv6 Only try to perform IPv6 lookups. -c or --config Only lookup and print results for address families that match locally configured addresses (If the system has no IPv4 resp IPv6 address, then IPv4 resp IPv6 addresses are ignored). -h or --help Display some help and exit. -m or --multiple Normally, if a name yields multiple results, only the first one is printed. With this optional parameter, all results will be printed on a single line, separated by spaces. -n or --numeric Prevent forward hostname lookup. This ensures that the input names are numeric addresses, which do not need to be looked up. Typically used along with the --reverse option to convert numerical addresses to canonical hostnames. -r or --reverse Perform a reverse DNS lookup (enabled implicitly with addr2name). addr2name prints numerical resolved addresses by default instead. --version Display program version and license and exit.
host(1), getaddrinfo(3), getnameinfo(3), resolv.conf(5)
Remi Denis-Courmont <remi at remlab dot net> $Id: addr2name.1 658 2010-10-31 20:56:30Z remi $ //www.remlab.net/ndisc6/ ADDR2NAME(1)

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