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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.
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To scan multiple locally accessible network segments, add them as subnets according to the [subnets](./SUBNETS.md) documentation.
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> [!NOTE]
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> Ping and `ARPSCAN` use different protocols so even if you can ping devices it doesn't mean `ARPSCAN` can detect them.
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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.
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## Complex Use Cases
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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.
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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.
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### Wi-Fi Extenders
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