If you use a /23 you can use the middle .0 too.
My favourite dumb networking trick though is that Linux lets you use an IPv6 address as an IPv4 gateway.
ip -4 route add default via inet6 fe80::1 dev eth0
That works so long as the gateway is running dual stack.







It makes sense if you think about it, but seeing IPv6 addresses in the IPv4 routing table still makes professional network engineers stop and boggle for a moment