Man1 - addr2name.1

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)

R�mi Denis-Courmont <remi at remlab dot net>

http://www.remlab.net/ndisc6/