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When I run netstat -v -a -p udp to show the open UDP sockets, I get the following output(truncated):

Active Internet connections (including servers)
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)      rhiwat  shiwat    pid   epid state  options           gencnt    flags   flags1 usscnt rtncnt fltrs
udp4       0      0  *.53939                *.*                                 786896    9216  20275      0 00180 00000000 0000000000de0741 00000000 04400800      1      0 000003
udp46      0      0  *.56128                *.*                                 786896    9216  20275      0 00180 00000000 0000000000de0740 00000000 00400800      1      0 000003
udp4       0      0  *.*                    *.*                                 786896    9216  78049      0 00080 00000000 0000000000dd0358 00000000 00002800      1      0 000001

Is there documentation about what all the columns mean? I am especially interested in the last columns or more specifically: state, options, gencnt, flags, flags1, usscnt, rtncnt and fltrs.

There is one related question, that already answered it about rhiwat and shiwat: What do the "shiwat" and "rhiwat" columns mean in output of netstat -v?

R-HIWA    Receive buffer high water mark, in bytes.
S-HIWA    Send buffer high  water mark, in bytes.
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  • Does this answer your question? What's the meanings of the Routing tables' data in the Mac OS?
    – Allan
    Commented Mar 27 at 1:34
  • Did you try the man page?
    – Allan
    Commented Mar 27 at 1:34
  • I tried the man page on my Mac and the one linked to by my related question. But it could well be that I just missed the information. The question you linked is about the routing table, which in my understanding a completely different output. This is about open sockets, not the routing table.
    – Garuno
    Commented Mar 27 at 1:44

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