On linux you can use the host command to find out all the IP address for a hostname or website. Here is an example:
host us-california.privateinternetaccess.com
Example output:
us-california.privateinternetaccess.com has address 107.152.98.165
us-california.privateinternetaccess.com has address 107.152.98.152
us-california.privateinternetaccess.com has address 198.8.80.182
us-california.privateinternetaccess.com has address 198.8.80.31
us-california.privateinternetaccess.com has address 198.8.80.172
us-california.privateinternetaccess.com has address 198.8.80.149
us-california.privateinternetaccess.com has address 198.8.80.17
us-california.privateinternetaccess.com has address 198.8.80.60
us-california.privateinternetaccess.com has address 198.8.80.174
us-california.privateinternetaccess.com has address 107.152.98.171
us-california.privateinternetaccess.com has address 198.8.80.13
us-california.privateinternetaccess.com has address 198.8.80.212
us-california.privateinternetaccess.com has address 198.8.80.32
