> isip: y 1.2.3.4
> isip4: y 1.2.3.4
> isip6: n 1.2.3.4
+> isip: n ::1.2.3.256
+> isip4: n 1.2.3.256
> isip: n 1:2:3:4
> isip4: n 1:2:3:4
> isip6: n 1:2:3:4
> isip: y fe80::a00:20ff:fe86:a061
> isip4: n fe80::a00:20ff:fe86:a061
> isip6: y fe80::a00:20ff:fe86:a061
+> isip: y fe80::1.2.3.4
> isip: n rhubarb
> isip4: n rhubarb
> isip6: n rhubarb