<P> If you insist on matching a range of networks, the network and wildcard mask combination of 1.1. 0.0 0.0. 255.255 would match any interface in the range of 1.1. 0.0 to 1.1. 255.255 . Because of this, it's simpler and safer to stick to using wildcard masks of 0.0. 0.0 and identify each OSPF interface individually, but once configured, they function exactly the same--one way is not better than the other . </P> <P> Wildcard masks are used in situations where subnet masks may not apply . For example, when two affected hosts fall in different subnets, the use of a wildcard mask will group them together . </P> <Table> <Tr> <Th> Slash </Th> <Th> Netmask </Th> <Th> Wildcard Mask </Th> </Tr> <Tr> <Td> / 32 </Td> <Td> 255.255. 255.255 </Td> <Td> 0.0. 0.0 </Td> </Tr> <Tr> <Td> / 31 </Td> <Td> 255.255. 255.254 </Td> <Td> 0.0. 0.1 </Td> </Tr> <Tr> <Td> / 30 </Td> <Td> 255.255. 255.252 </Td> <Td> 0.0. 0.3 </Td> </Tr> <Tr> <Td> / 29 </Td> <Td> 255.255. 255.248 </Td> <Td> 0.0. 0.7 </Td> </Tr> <Tr> <Td> / 28 </Td> <Td> 255.255. 255.240 </Td> <Td> 0.0. 0.15 </Td> </Tr> <Tr> <Td> / 27 </Td> <Td> 255.255. 255.224 </Td> <Td> 0.0. 0.31 </Td> </Tr> <Tr> <Td> / 26 </Td> <Td> 255.255. 255.192 </Td> <Td> 0.0. 0.63 </Td> </Tr> <Tr> <Td> / 25 </Td> <Td> 255.255. 255.128 </Td> <Td> 0.0. 0.127 </Td> </Tr> <Tr> <Td> / 24 </Td> <Td> 255.255. 255.0 </Td> <Td> 0.0. 0.255 </Td> </Tr> <Tr> <Td> / 23 </Td> <Td> 255.255. 254.0 </Td> <Td> 0.0. 1.255 </Td> </Tr> <Tr> <Td> / 22 </Td> <Td> 255.255. 252.0 </Td> <Td> 0.0. 3.255 </Td> </Tr> <Tr> <Td> / 21 </Td> <Td> 255.255. 248.0 </Td> <Td> 0.0. 7.255 </Td> </Tr> <Tr> <Td> / 20 </Td> <Td> 255.255. 240.0 </Td> <Td> 0.0. 15.255 </Td> </Tr> <Tr> <Td> / 19 </Td> <Td> 255.255. 224.0 </Td> <Td> 0.0. 31.255 </Td> </Tr> <Tr> <Td> / 18 </Td> <Td> 255.255. 192.0 </Td> <Td> 0.0. 63.255 </Td> </Tr> <Tr> <Td> / 17 </Td> <Td> 255.255. 128.0 </Td> <Td> 0.0. 127.255 </Td> </Tr> <Tr> <Td> / 16 </Td> <Td> 255.255. 0.0 </Td> <Td> 0.0. 255.255 </Td> </Tr> <Tr> <Td> / 15 </Td> <Td> 255.254. 0.0 </Td> <Td> 0.1. 255.255 </Td> </Tr> <Tr> <Td> / 14 </Td> <Td> 255.252. 0.0 </Td> <Td> 0.3. 255.255 </Td> </Tr> <Tr> <Td> / 13 </Td> <Td> 255.248. 0.0 </Td> <Td> 0.7. 255.255 </Td> </Tr> <Tr> <Td> / 12 </Td> <Td> 255.240. 0.0 </Td> <Td> 0.15. 255.255 </Td> </Tr> <Tr> <Td> / 11 </Td> <Td> 255.224. 0.0 </Td> <Td> 0.31. 255.255 </Td> </Tr> <Tr> <Td> / 10 </Td> <Td> 255.192. 0.0 </Td> <Td> 0.63. 255.255 </Td> </Tr> <Tr> <Td> / 9 </Td> <Td> 255.128. 0.0 </Td> <Td> 0.127. 255.255 </Td> </Tr> <Tr> <Td> / 8 </Td> <Td> 255.0. 0.0 </Td> <Td> 0.255. 255.255 </Td> </Tr> <Tr> <Td> / 7 </Td> <Td> 254.0. 0.0 </Td> <Td> 1.255. 255.255 </Td> </Tr> <Tr> <Td> / 6 </Td> <Td> 252.0. 0.0 </Td> <Td> 3.255. 255.255 </Td> </Tr> <Tr> <Td> / 5 </Td> <Td> 248.0. 0.0 </Td> <Td> 7.255. 255.255 </Td> </Tr> <Tr> <Td> / 4 </Td> <Td> 240.0. 0.0 </Td> <Td> 15.255. 255.255 </Td> </Tr> <Tr> <Td> / 3 </Td> <Td> 224.0. 0.0 </Td> <Td> 31.255. 255.255 </Td> </Tr> <Tr> <Td> / 2 </Td> <Td> 192.0. 0.0 </Td> <Td> 63.255. 255.255 </Td> </Tr> <Tr> <Td> / 1 </Td> <Td> 128.0. 0.0 </Td> <Td> 127.255. 255.255 </Td> </Tr> <Tr> <Td> / 0 </Td> <Td> 0.0. 0.0 </Td> <Td> 255.255. 255.25 </Td> </Tr> </Table> <Tr> <Th> Slash </Th> <Th> Netmask </Th> <Th> Wildcard Mask </Th> </Tr>

What is the wildcard mask equivalent of the subnet mask /23