Ping is a network administrative utility available on many systems to verify reachability of a host in the IP network. Ping utility uses ICMP protocol to send ICMP echo requests to and receive ICMP replies from a host. Then based on the reply, it determines if a host is alive or not.
ETYN's Ping Test tool is a free web-based online version of the "ping" utility and can be used for the same purpose.
To use Ping tool:
Please note that if you see "a.b.c.d is unreachable" as the Ping result, it does NOT necessarily mean that the host a.b.c.d is not available; rather, it means that the host is either not available or it is available but a firewall is blocking the ICMP echo request/reply packets.