DNS. You're not supposed to remember ip addresses.

We are the sorry sods working on your VPNs, LANs and the like. There's no DNS for routable blocks yet.

Configuration systems for those typically do support symbolic prefixes for easy renumbering and deployment of sibling networks.

Also, most people dealing with rfc1918 networks would much rather get rid of addressing conflicts and other problems resulting from non-unique addresses, like security problems arising from ambiguous addressing. (Or don't know what they're missing...)

I remember 8.8.8.8

I remember 208.67.222.222 and 208.67.220.220 being someone who grew up in a country with DNS-level censorship way before Google announced their Public DNS.

Longer, but still memorable.

2001:4860:4860::8888

If you're talking about local addresses, can't you just use the short notation and use even-shorter-than-64-bits addresses?

If not, DNS is there for that.