If a tester is attempting to ping a target that exists but receives no response or a response that states the destination is unreachable, ICMP may be disabled and the network may be using TCP. Which t

Traceroute maps the network path to a destination and also typically relies on ICMP (or UDP) - it does not provide a simple TCP-based host liveness check and will also be blocked if ICMP is disabled.

Hping is a command-line packet crafting and analysis tool that supports TCP, UDP, ICMP, and raw IP modes, allowing a tester to send TCP SYN or ACK packets to a target host and observe responses - functioning as a TCP-based ping even when ICMP is completely filtered. For example, 'hping3 -S <target> -p 80' sends a TCP SYN to port 80 and a SYN-ACK or RST response confirms the host is alive, bypassing ICMP-based firewall rules.

While 'TCP ping' describes the concept, it is not a standalone widely recognized tool in the same way Hping is - Hping is the industry-standard tool used to perform this function in penetration testing.

Broadcast ping sends ICMP echo requests to a network broadcast address and depends entirely on ICMP, making it useless when ICMP is disabled on the target network.