Default TTL and Hop Limit values vary between different operating systems, here are the defaults for a few: Linux kernel 2.4 (circa 2001): 255 for TCP, UDP and ICMP Linux kernel 4.10 (2015): 64 for TCP, UDP and ICMP Windows XP (2001): 128 for TCP, UDP and ICMP Windows 10 (2015): 128 for TCP, UDP and ICMP Windows Server 2008: 128 for TCP, UDP and ICMP Windows Server 2019 (2018): 128 for TCP, UDP and ICMP MacOS (2001): 64 for TCP, UDP and ICMP
