In my day we memorized IPs AND ports. 10.24.67.22:78342 was to access our bug tracker and 192.168.240.17:21282 was for our CVS repository!

Seriously though, one of the first things I did when I was hired as the sysadmin for a small company was to eliminate the need for memorizing/bookmarking ip-port combos. I moved everything to standard ports and DNS names.

Any services running on the same machine that needed the same ports were put behind a reverse proxy with virtual hosts to route to the right service. Each IP address was assigned an easy-to-remember DNS name. And each service was setup with TLS/SSL instead of the bare HTTP they had previously.