For example, 0123.4567.89AB is a valid MAC address. Another way to represent them is to form three groups of four hexadecimal digits separated by dots (.). For example, 01-23-45-67-89-AB is a valid MAC address. In summary, InetAddress.getLocalHost() will typically work, but you may need to provide an alternative method for the cases where your code is run in an environment with “complicated” networking. One way to represent them is to form six pairs of the characters separated with a hyphen (-) or colon (:). Another variation is to to get the IP address from a config file or a command line parameter.A variation of the previous is to get the preferred FQDN from a config file or a command line parameter.(But how do you get it, and how do you deal with a DNS-based load balancer?) Another approach is to (somehow) get the externally advertised FQDN for the host, and use InetAddress.getByName() to look up the primary IP address.One approach is to use Java’s NetworkInterface.getNetworkInterfaces() API to get all of the known network interfaces on the host, and then iterate over each NI’s addresses.Anything on the other side of a router returns the MAC of the interface on the side of the router nearest the server. That works, but will only return MACs on IPs that are on the same segment as the server. What this means is that the IP address returned by InetAddress.getLocalHost() might not be the right one to use. Get the IP address from the request and use this to find the mac address. Some could be virtual devices, and others could be private network IP addresses.

And to top that, not all IP addresses will be reachable from off the machine. If you want to check the MAC address of all the network interfaces then you need to simply use ip addr sh command and check the MAC address from ether field as shown below. The problem is that a host could have lots of network interfaces, and an interface could be bound to more than one IP address. Method 3: How to find MAC Address in Linux Using ip addr sh command. On the face of it, InetAddress.getLocalHost() should give you the IP address of this host.

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Java 8 mac address