am i under dos attack?

my server's apache keeps getting killed for using too much resources, a quick check on netstats shows this :

tcp 0 0 server-ip:80 68.154.254.46:3181 SYN_RECV
tcp 0 0 server-ip:80 216.233.120.28:60954 SYN_RECV
tcp 0 0 server-ip:80 24.33.80.239:3995 SYN_RECV
tcp 0 0 server-ip:80 24.33.80.239:4102 SYN_RECV
tcp 0 0 server-ip:80 71.97.3.7:2611 SYN_RECV
tcp 0 0 server-ip:80 209.33.61.63:2798 SYN_RECV
tcp 0 0 server-ip:80 198.207.222.132:30125 SYN_RECV
tcp 0 0 server-ip:80 24.164.121.212:4454 SYN_RECV

 

 

 

 

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