![]() When nslookup is given an IP address, it will try to do a PTR lookup.Īs per the other reply, if the IP belongs to a Windows machine, you can also do nbtstat -A 10.31.46. So to get the hostname of 10.11.12.13, we say to DNS "Give me the PTR record for 13.12.11.10.in-addr.arpa." The IP address in the PTR record is reversed. However, there is no obligation to store PTR records so they may not be present, in which case the lookup will fail. For each IP address, there is a PTR record in which is stored the associated hostname. In DNS this is achieved through PTR records. Once you have the IP address, you are relying on a name resolution service to do a reverse lookup and return a hostname that is associated with an IP. How to Set a Specific IP Address via Terminal in OS X. You can trigger arp requests manually by pinging every IP on the network, or using a utility like nmap to do them all in one go. Execute ping command ping 192.168.0.2 (NOTE: the instrument does not respond to ping) Repeat this from 192.168.0.2 to 192.168.0.255. In order for this to work, both devices must be on the same layer 2 network - the same switch/vlan. In order to populate that list, the machine will have had to at some point issued an arp request, saying "who has IP x.x.x.x" - the owner will reply and upon receipt, the arp table will be populated. As per the question, arp -a will list the MAC addresses and corresponding IP addresses. This means that you need access to a device that has the IP address associated with the MAC. Select the one for the Ethernet card.If you start with a MAC address, you first need to get the IP address. Run the command without parameters, /sbin/ifconfig, to get all adapters on your machine. This means that the Ethernet adapter can have a different name than eth0. For older Linux versions the 12-digit number will be listed after "HWaddr".įor newer versions of Linux distributions, consistent network device naming has been deployed. The HostID is the 12-digit number after "ether". Type in /sbin/ifconfig eth0 at the command prompt and press Return.
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