I'm pretty sure you can still express IP subnets in exit policies. From https://www.torproject.org/docs/tor-manual.html.en https://www.torproject.org/docs/tor-m

I'm pretty sure you can still express IP subnets in exit policies. From https://www.torproject.org/docs/tor-manual.html.en https://www.torproject.org/docs/tor-manual.html.en, heading "ExitPolicy policy,policy,…": Each policy is of the form "accept|reject ADDR[/MASK][:PORT]". If /MASK is omitted then this policy just applies to the host given. Instead of giving a host or network you can also use "*" to denote the universe (0.0.0.0/0). PORT can be a single port number, an interval of ports "FROM_PORT-TO_PORT", or "*". If PORT is omitted, that means "*".