how to find default IP TTL value of the remote system

TTL value is 1 byte within IP header.

1. "ping " will show ttl returned by the remote machine.
2. Find out how many hops between src and remote ip. traceroute/mtr
3. Add the value from Step 1 and 2 will get the default TTL value of remote system
4. For the curious, can look up http://www.binbert.com/blog/2009/12/default-time-to-live-ttl-values/ to take a guess what the remote system might be.