UDP connections with no foreign address

root@sshgw:~# netstat -nup

Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

root@sshgw:~# netstat -nlup

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp    19968      0 0.0.0.0:60001           0.0.0.0:*                           19042/mosh-server

Foreign Address: 0.0.0.0:*

UDP is a connectionless protocol, meaning that it sends and receives packets without any notion of who connected to who,

whether the packet is part of an existing conversation, or whether the data just arrived out of the blue.