Other possible annotations displayed after the time are:

    !H    Host is unreachable.
    !N    Network is unreachable.
    !P    Protocol is unreachable.
    !F    Fragmentation needed.

          This indicator may show up if the -f command line option
          is being used, and the associated gateway requires further
          fragmentation. In case the desired new MTU size is known,
          it is indicated.
    !S    Source route failed.

          This should not occur under normal circumstances and the
          associated gateway might be broken if you see one.
    !T    Host or network is unreachable for the given tos.
    !U    Destination is unreachable.

          This indicator is printed for some of the new unreachable
          subcodes as defined in RFC 1812.
    !A    Some routers fail to generate an ICMP "port unreachable"
          message, but send an ICMP "time exceeded" message instead
          if they are the target host. The indicator is printed if
          this is detected.
    !G    Some routers erroneously generate ICMP "port unreachable"
          instead of "time exceeded" if they are specified as loose
          source route gateway hosts. The indicator is printed if
          this is detected.

          If all the probes result in an unreachable status,
          traceroute stops sending probes and exits.