Yes, a couple of them. 127.0.0.1, 192.168.1.1, 8.8.8.8, 8.8.4.4

Stopped a while ago before ipv6 proliferated but I know of ::1

This is about memorializing, not memorizing. The post explains what is meant by that :).

I'm always amazed at how hard it is for most people to read carefully. Memorialize /= memorize.

194.231.30.130

That’s the IP of the company I was working for during late 90s / early 00s, and is the one which I used to initially create the Wikipedia entry for my hometown Grevenbroich (which is still visible as the first entry on its Versions page).

I don’t know how often I wrote or said this address out loud — will probably stay on my mind forever. I can easily recall it even if years have passed since I‘ve last thought of it.

Now, if only I could remember my Geocities username…

1... 2... 3... a new startup founded to memorialize the last IP of beloved ones who passed away.

203.21.30.124 and .125 were the IPs of the DNS servers for the ISP I worked at in the late 1990s

So many hours talking customers through DNS settings on the help desk.

I still own a class C from the 90s when we ran an ISP on Windows NT and can recite the base address still.