Everyone knows ping. But over the decades, the networking community has quietly built an entire family of specialized variants — each solving a problem that standard ICMP couldn't. A few examples of why you'd reach for something else:<p>tcping — when firewalls eat your ICMP and you need to test port availability<p>arping — L2 diagnostics and duplicate IP detection, no IP stack needed<p>fping — scan a /24 in seconds, all hosts in parallel<p>OWAMP — when you actually need one-way latency, not just RTT<p>dnsping — when the slowness lives in your resolver, not the network<p>I put together a comparison table of the most useful ones, across protocol, OSI layer, platform, multi-host support, and root requirements. The OSI layer column alone tells you a lot — if you're reaching for ping to debug something that lives at L4 or L7, you're probably using the wrong tool.