Detect if a network is blocking outgoing ports

nmap -p 22 portquiz.net

time nmap -p 22 portquiz.net

telnet portquiz.net 80

time nmap portquiz.net

time nmap -p- portquiz.net | grep -i open

References
https://superuser.com/questions/1336054/how-to-detect-if-a-network-is-blocking-outgoing-ports
http://portquiz.net/