1. If you were able to register a handset, you can just use the display of the handset. In the menu, there is an icon “Settings” and at the very bottom there is “System Info”. On the first page you’ll see the MAC address and the IPv4 address of the base. Voila! On the other pages you can see more information like the software version, the DECT identifiers and so on.
2. If you are registered to a SIP server such as the snom ONE PBX, you can check the web interface there to see what IP address has been registered.
3. If you have access to the device that runs the DHCP server in your network, there is usually also a way what leases the DHCP has issued. For example, most SoHo routers show the DHCP table in their web interface. The snom m9 uses MAC addresses that start with 00041330xxxx, so as long as you don’t run too many m9 in your network, it should be easy to figure out which one you got.
4. If you are running Windows 7, Windows Vista, Linux, MacOS or another operating system that supports IPv6, there is a another astonishing simple way to log into the web interface. You can use a link-local address which is based on the MAC address. Essentially you need to look up the last 4 digits of the MAC address and copy it onto the following link: http://[fe80::204:13ff:fe30:xxxx], where you have to copy the last 4 digits into the xxx area. Then you can go to the status screen and check out what IP address was assigned to the device. BTW this is also a great way to debug problems with DHCP, because you can for example get a PCAP trace from the device easily.
5. If that all does not work for you, there is still the good old way to use Wireshark and filter for bootp. Then you will also see the DHCP traffic between the snom m9 and the DHCP server and drill into the packets to get its IP address.
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