How to understand the NETSTAT Flags logo

Flags: The meaning of multiple different flags:

U (route is up): The route is valid;
H (target is a host): The target is a host rather than a domain;
G (use gateway): The packet needs to be forwarded through an external host (gateway) (usually directed to the default gateway);
R (reinstate route for dynamic routing): When using dynamic routing, the routing information is restored Flag;
D (dynamically installed by daemon or redirect): has been set as a dynamic route by the service or port function;
M (modified from routing daemon or redirect): the route has been modified;
! (reject route): This route will not be accepted (used to defend against unsafe domains).

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