Your domain's whois data is public knowledge. This is international law and very standard practices. There are places to protect some of your Whois information, but Rebrandly does not currently offer those services.
To check your Whois data there are many free online services. For example you can go to http://whois.domaintools.com and type in the domain name you are looking for.
For example, for Rebrandly.link, we are:
This article is about:
- How to check your Whois data
- How to verify that I own a domain
- How to find the owner of a domain