Quickly get all your DHCP info with ipconfig
If you’ve ever needed to troubleshoot a network or internet connection, you know how frustrating it can be (particularly when you’re on techsupport with various broadband providers). This quick tip can make the job a little easier on yourself. Open the command line and using the ipconfig utility, you can quickly access all of your DHCP info.
The command usage for a Mac using WiFi is usually as follows:
ipconfig getpacket en1
The command for a wired network using ethernet is usually:
ipconfig getpacket en0
You’ll be presented with a bunch of information, but the most useful of which is usually the DHCP data at the end as seen in the screenshot. I hope this helps you as much as it helped me!

[...] OS-X Daily You can also find your router address ipconfig getoption en0 [...]
in my case, I get no result entering this command.
what’s wrong?
Mac OS X 10.6.4 (Mac Pro)
Hi!
There is a nice script that shows how to parse the the output of ipconfig using regular expressions:
https://gist.github.com/1825733#file_getnet.sh
@bison: If you don’t get a response the respective interface (en0 or en1) is down / has not received a DHCP configuration.