PING www.cervenka.cz (212.95.50.155) 56(84) bytes of data.
64 bytes from opal16.opalstack.com (212.95.50.155): icmp_seq=1 ttl=58 time=12.4 ms
64 bytes from opal16.opalstack.com (212.95.50.155): icmp_seq=2 ttl=58 time=12.2 ms
64 bytes from opal16.opalstack.com (212.95.50.155): icmp_seq=3 ttl=58 time=12.2 ms

--- www.cervenka.cz ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 12.212/12.312/12.448/0.099 ms