Traceroute return code

c	Description
nn msec	For each node, the round-trip time in milliseconds for the specified number of probes
*	The probe timed out
A	Administratively prohibited (example, access-list)
Q	Source quench (destination too busy)
I	User interrupted test
U	Port unreachable
H	Host unreachable
N	Network unreachable
P	Protocol Unreachable
T	Timeout
?	Unknown packet type