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I did phone support for a dial-up ISP 20 years ago. I can still remember their IP for www., as well as ns1. and ns2.

And I’ll probably take the root password to their RADIUS server to my grave.

For ipv4, i will often memorize an address for short periods of time, to type them in somewhere else, or to be able to recognize a particular address in logs or something.

With ipv6, that's less doable.

I only remember the last 2 octets since we own the entire 132.20 space and most 131 and 132 in general for my job.