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.
Display program version and license and exit.
Rémi Denis-Courmont <remi at remlab dot net>