OS-X DHCP Information

For Wireless

ipconfig getpacket en1

For Wired

ipconfig getpacket en0

From OS-X daily

You can also find your router address

ipconfig getoption en0 router

Your Name Server

ipconfig getoption en0 domain_name_server

Your IP Address

ipconfig getifaddr en0

Create an alias to a new IP address

ifconfig en0 alias

And to remove the alias

ifconfig en0 -alias