Ping (ICMP)

Ping is a network diagnostic request built on ICMP (Internet Control Message Protocol). It is used by operating systems and network devices to check whether a host is reachable and to measure how long a round trip to that host takes. A ping request is one of the oldest and simplest ways to answer the question "is this thing even online?"

How ping monitoring works

Ping monitoring sends ICMP echo requests to a server or device at a fixed interval and measures whether — and how quickly — it replies. A successful reply confirms basic network reachability; a timeout or failure means a broken connection somewhere between the checking location and the target, whether that's the server itself, a router along the path, or a firewall dropping the packet. Because ping operates below the application layer, it's useful for spotting network-level problems (routing, packet loss, a downed host) that an HTTP check alone might not distinguish from an application-level failure.

Ping vs. HTTP monitoring

Ping and HTTP monitoring answer different questions and work best together. Ping tells you whether the server or network device is reachable at all. HTTP tells you whether the web application on top of it is actually serving pages correctly. If ping succeeds but an HTTP check fails, the problem is very likely in the application, not the network — narrowing down the cause considerably faster than either check alone.

Limitations of ping

Ping isn't a complete picture on its own. Many networks and firewalls block incoming ICMP requests specifically to reduce exposure to certain denial-of-service techniques, so a ping failure sometimes just means ICMP is blocked, not that the host is actually down — this is a common false-positive source if ping is used as the only check. Ping also can't tell you anything about application health, response content, or whether a specific service on the host is actually working, which is why it's normally paired with a protocol-level check like HTTP or TCP port for anything customer-facing.

How HostTracker uses ping

Ping is one of 14 check types HostTracker runs from 300+ monitoring locations worldwide, so a single blocked or unreliable path from one location doesn't get mistaken for a real outage. Run a free check with the ping test tool, or add continuous ping monitoring alongside HTTP checks for full network-and-application coverage. See the ping check guide for setup details.