![]() ofcourse if u have cooperation from the other machine, why this much of effort a simple ifconfig -a does the job, that to for all the interfaces on that machine. See if you have cooperation at the other machine, you can write a small app, which encapsulates the the mac header and sends to you. In the case of the above entered IPv4 address, the tool provides you following results. The tool processes your request and provides you a converted IPv6 address. Click on the 'Convert IPv4 to IPv6' button. To escape or remove the information which is relevant to layers below the present, and as we across the networks IP is used, so no MAC. Suppose you enter an IPv4 address 127.255.255.255. Well the way networking, rather layering is designed, this is a deliberately unwanted behavior. Now for the machine outside your subnet - there is no standard of the shelf application which does that, i tried to think if any ICMP message can do it, but as of now i think there is none. This is the same cache which give "IP resolution conflicts". How can you find the MAC for a particular IP(machine) which is not the part of your subnet?įor the all the machines/IPs on your subnet the IP-MAC table is stored in ARP Cache, locally on your machine. They will always return MAC address as 00-00-00-00-00-00. The above technique wont work on Linux samba servers. But if network has lot of Linux machines then there is no good very common way to find MAC from other networks. Hence if there are lot of windows machines on your network you can find MAC address for them even when are not in their subnet. But I guess you have to be administrator for accessing router or DHCP server. Then the only options are seeing MAC address table in router, or if there is common network wide DHCP server then you can see MAC address in DHCP logs. If the machine in question is not a windows machine and there is no way to become part of other subnet. To do the same thing from Linux machine (with samba installed) use command nmblookup -R -S -A These are used (similarly to ipv4 link-local addresses) as part of the allocation process. ![]() The addresses you listed are link-local addresses. For example to find MAC address of a Windows PC on other network when you know its IP address you can use command nbtstat -A Unless you have a router or network which allocates ipv6 addresses (or you manually allocate them) you will NOT have an ipv6 address. But there are some protocols that may help you in finding MAC address from anywhere in network. The fe80:: IPv6 link-local prefix is always used for link-local no matter what IPv6 network you're on, so the use of that prefix is not an information leak.It cannot be guaranteed that you can see MAC address of machines behind a router. That feature would also protect you from being tracked by your IPv6 link-local addresses. Windows 10, like most modern mobile OSes, has the ability to randomize the MAC addresses of interfaces (particularly Wi-Fi), so keep you from being tracked by your Wi-Fi MAC address. So it can't be used to, say, track your activity between websites, but it could be used by, say, public Wi-Fi hotspot networks to track how often you visit their coffee shops. But also, this address should never make it off your local network segment. ![]() This address only changes if you change your MAC address. So if your interface's MAC address is 00:11:22:33:44:55, your IPv6 link-local address on that interface will be: The swizzling involves setting the "locally administered" bit, which is the 2's place bit of the first octet of the MAC address, and putting "fffe" in the middle of the MAC address. IPv6 link-local addresses are generated by taking the IPv6 link-local prefix fe80:: and appending a slightly swizzled version of the interface's MAC address to it. ![]()
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