[nailer]

40979067. I don't even know how I remember. I haven't used ICQ for 15 years.

[NDizzle]

274231.

I no longer have access to the @r33t.org email address, nor do I know the password. Unfortunate.

edit: Looking at the profile it seems that a Russian hacked/took over the account who knows how long ago.

[codezero]

I don't even know what email my account uses, but I was able to log in to my account via the web UI, I'm more surprised that I remember my password than I am that I remembered the account number :)

[jforman]

http://www.icq.com/people/159272/en

Thought about selling it on ebay, since six-digit accounts used to fetch a non-trivial amount of money. But decided it wasn't worth the $100.

[Brandon0]

How is it we all still remember these numbers however many decades later??

http://www.icq.com/people/20687859/en

[Aldo_MX]

I have no idea my friend...

http://www.icq.com/people/60459407/en

[bhouston]

Whoa, that was a long time ago:

http://www.icq.com/people/9275290/

[kaivi]

180662 - I am still using mine.

[w1ntermute]

Why didn't they allow strings for username? Technical limitations?

[aylons]

Actually, the uin was not that important. You could be identified by your email, for instance, or name and surname.

But people had the habit of exchanging UIN and this was it.

24811423

[codezero]

338589

Probably we remember because the client made you type it to log in? I forget, but I feel like this is true :)

[jaredsohn]

I think it was due to how you tell people to add you as a friend. There was a search you could do but if you had a common name there would be multiple matches (and I don't think there were photos or a count of mutual friends to help you figure out which one) and perhaps it might have been easier than telling someone to look you up via email (especially since email addresses were often random words rather than first.last@gmail.)

[krstck]

52535425. And then I was so angry when that "children under 13 can't use the internet" or whatever act went into effect and I got locked out of it (young and stupid enough to put my real birth date!). I made a new account but can't remember the ID, I stopped using it pretty quickly after that.

[grigory]

316666. Haven't used it in many years. Obtaining that number was fun, as well :)

[Kiro]

How did you obtain it?

[grigory]

Hard to remember exact details, but it was a bit "grey hat". Exploits of a foolish youth!

[mads]

3333801 - actually managed to login. Wow...