Identify OS

Concept¶

Time-to-live (TTL) refers to the amount of time or "hops" that a packet is configured to exist within a network before being discarded by a router. TTL is also used in other contexts, such as CDN caching and DNS caching.

Well, it turns out that different operating systems have different default TTLs. For example, on Windows operating systems, the default TTL value is 128, while on Linux operating systems it is 64.

Subin’s Blog for search TTL

Note

on Windows servers is not case sensitive

commands¶

nslookup  google.com              # dns 
whois 10.10.10.10                 # public information
ping -c 1 IP                      # sent a ping for show information of TTL

Docs¶

https://ping.eu/nslookup/         # nslookup online
https://ping.eu/ping/             # ping information
https://en.ipshu.com              # nslookup online