One way to improve this overall is to set up a VPN connection between your customer and you. Use it for the SQL connection and close 1433. This encrypts the data while also making it harder to spoof the IP of your partner.
If the other PC’s don’t use DHCP then you won’t see them, use IPCONFIG /ALL on them to see how they are configured.. The printer likely has an option to print out it’s configuration. See if has an IP from your scope(probably does not) or if it is set to us DHCP
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