Exam irrespective of whether that address is reachable. Very best work is produced by the implementation to test to get to the host, but firewalls and server configuration might block requests causing a unreachable standing Although some unique ports could be obtainable. A normal implementation will use ICMP ECHO REQUESTs https://oxodirectory.com/listings12864349/the-smart-trick-of-tronlending-that-no-one-is-discussing