Fping
Ping many hosts in parallel. One host per line, or comma-separated. Max 32.
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NetTests can run this check on a schedule, preserve historical results, compare changes over time, and alert you the moment something breaks.
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How is Ping Scanner different from a regular ping?
Ping Scanner uses fping to send ICMP echo requests to multiple hosts simultaneously in parallel, reporting which are alive. A standard ping tests one host at a time sequentially. This makes Ping Scanner ideal for quickly checking a list of hosts, subnets, or servers without waiting for each to complete individually.
A host shows as unreachable — is it down?
Not necessarily. Many servers and firewalls block ICMP ping requests as a security measure. An unreachable result means ICMP echo requests received no reply within the timeout — the host may still be serving traffic on TCP/UDP ports. Use HTTP Request Timing to check HTTP/HTTPS accessibility.
Why does ping sometimes show higher latency than expected?
ICMP packets are often deprioritised by routers and firewalls (put in a low-priority queue) compared to real application traffic. Ping latency may be higher than what TCP connections actually experience. Consistent packet loss or latency above 200 ms from multiple locations is a better indicator of a problem than occasional spikes.
How many hosts can I scan at once?
The tool accepts a space- or newline-separated list of hostnames and IPs. Keep the list to a reasonable size (under 50 hosts) to avoid excessive scan times. For large-scale host discovery, fping can be run directly on a network where you have proper authorisation.