Paul, thx!
all is o.k. now

Here is what I did without core-destruction. While it's obviously not as good as the above solution (which is perfect and easy to use for a moderator at all level and on "remote" computers), it still may be a good solution:

Paste {$thisIp} into the email_admin_userregister_eng.txt file.

The drawback is that you'd have to keep the registration emails of your members handy in case you want to look up their IP...

Well, I have just imleplemented it but only a half of it works. It does write the ip into the database (chceked by PHP admin), but it dies nit write anything into the users profile (yes I am logged as admin).

Can it be bit obsolete, if the solution, code is from 2006??

You need to change the index of $l_usrInfo[15] variable to the index calculated dependently on the ordinal number of custom field. I suppose it should be 17 but not sure. Study our article on how to add the new profile field correctly and associate language variable with it.

The code should fully work with the recent miniBB release.

Thank you very much! You made my day. This will save a me a lot work! (It was "16" in my case).

I found yet another alternative way to save user information (not only IP but also other essential details). It's core-destructive but easy to do if you remember to put the change in your custom-changes.txt file ;):

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1. Create a text file (could be named: reg-data.txt or something more unique), place it in main forum folder, and make sure it's good for writing (777).

2. Open: bb_func_regusr.php file and paste the following code ABOVE this:

/* Auto Sign-in */
if(!isset($closeRegister) or $closeRegister==0){

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That way you'll have a record of all newly registered users and can easily look it up if needed. You can then give link to the file to your trusted moderators ;).