| apple_captive_test | Download Apple's captive portal test |
| is_online | Is the computer online? |
| is_up | Check if a port of a server is active, measure response time |
| my_ip | Query the computer's public IP address |
| nsl | DNS query |
| ping | Ping a remote server, to see if it is alive |
| ping_port | Check if a port of a server is active, measure response time |