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By design, local network scanners such as `arp-scan` use ARP (Address Resolution Protocol) to map IP addresses to MAC addresses on the local network. Since ARP operates at Layer 2 (Data Link Layer), it typically works only within a single broadcast domain, usually limited to a single router or network segment.
To scan multiple locally accessible network segments, add them as subnets according to the [subnets](./SUBNETS.md) documentation.
> [!NOTE]
> Ping and `ARPSCAN` use different protocols so even if you can ping devices it doesn't mean `ARPSCAN` can detect them.
To scan multiple locally accessible network segments, add them as subnets according to the [subnets](./SUBNETS.md) documentation. If `ARPSCAN` is not suitable for your setup, read on.
## Complex Use Cases
The following network setups might make some devices undetectable. Check the specific setup to understand the cause and find potential workarounds to still report on these devices.
The following network setups might make some devices undetectable with `ARPSCAN`. Check the specific setup to understand the cause and find potential workarounds to report on these devices.
### Wi-Fi Extenders