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View network routing tables and statistics
You can use Network Utility to examine your computer’s network routing tables by viewing a detailed summary of packet types sent and received using common network protocols.
Packet summaries are provided for TCP, UDP, IP, ICMP, IGMP, IPSEC, IP6, ICMP6, IPSEC6, and PFKEY.
Open Network Utility.
Click Netstat, select the type of information you want to see, then click the Netstat button.
For help interpreting the results, or for information about the underlying netstat command and how you can use it to produce other reports, open Terminal (in Applications > Utilities), then type netstat at the command line.