simple but usefull – you have the ip address of an computer in your local LAN – but you don’t know it’s computername.

for internet-usage the host command is usefull because it shows – if a website is reachable by IPv6 or not. (your LAN network needs to operate in IPv6 in order to ping6 host)

suse12:~ # host 172.20.0.7
7.0.20.172.in-addr.arpa domain name pointer COMPUTERNAME.DOMAIN.local.

suse12:~ # host yahoo.de
yahoo.de has address 124.108.105.24
yahoo.de has address 106.10.212.24
yahoo.de has address 77.238.184.24
yahoo.de has address 74.6.50.24
yahoo.de has address 98.137.236.24
yahoo.de mail is handled by 10 mx-eu.mail.am0.yahoodns.net.
suse12:~ # host dwaves.de
dwaves.de has address 78.46.249.71
dwaves.de has IPv6 address 2a01:4f8:c17:1b24:2::
dwaves.de mail is handled by 10 dwaves.de.

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