> cut-and-paste repeatedly as needed

Pretty much this, though with IPv4 as I don't trust myself to remember that either.

I find myself increasingly frustrated with tools which force GUI flows or context switches that require me to do that, though. I prefer a 'edit a bunch of flat files in repos, push, magic config engine makes it happen' flow.

It's quicker for me to copy-paste than it is to type even an IPv4.