To perform a WHOIS on your domain, please do the following:
Login to your 123-reg control panel.
Scroll down to the web hosting section.
Select the relevant domain name from the drop down box and click on the Manage button.
Click on the WHOIS Domain option in the Website Help & Diagnostics section.
Enter the domain name that you wish to perform the WHOIS lookup on into the box and press the WHOIS Domain button.
The results will then be displayed on the page.