Duplicate account check

Duplicate account check 2.0

No permission to buy ($35.00)
Compatible XF 2.x versions
2.0, 2.1
Premium upgrade:

This XF2 add-on along with the entire collection can be purchased for $35.00 USD. Your Premium upgrade will allow you to download as many XF2 add-ons as you like for one year. Please see the entire collection located in the Resources area at this URL:



Checks for duplicate user accounts.

If two or more valid users have logged into your forum with the same IP and User Agent, they will be flagged as duplicate and the admin will receive an email.

(Example of email)


(Example of Options page)


  • Checks for duplicate IP and User Agent.
  • Checks for user_state of 'valid'.
  • All phrases start with duplicateaccountcheck_ for your convenience.
  1. Download Andy-DuplicateAccountCheck-2.0.zip and unzip it.
  2. Copy the src/addons/Andy/DuplicateAccountCheck directory to your server.
  3. From the Admin Control Panel Install the add-on.
Database changes:

This add-on will add a table called 'andy_duplicate_account_check' to your database.
First release
Last update
5.00 star(s) 1 ratings

More resources from AndyB

Latest updates

  1. See description

    Duplicate account check v2.0 changes: Updated code used to get IP address.
  2. See description

    Duplicate account check v1.9 changes: Fixed issue dealing with intermittent duplicate entry error.
  3. See description

    Duplicate account check v1.8 changes: Corrected issue with Exclude usernames in the Options page.

Latest reviews

Works great, maybe too good! Be prepared to disable this if you get hammered the first day or two about accounts with duplicate IPs.

You'll need to figure out if any Admin accounts need to be whitelisted, and any family users (like a husband and wife, or a father and son pairs) who have the same internet connection need to be whitelisted. At least that's what I needed to do before I reactivated this tool!