Most of the available DNS lookup tools require technical knowledge. You may want to use a more simple means of checking your DNS records. There are online tools out there that will do all of the work for you. They will check the root servers, follow them to the name servers, and return the information.

Some of these sites are:

Just type in your domain name (without the www.) in the box provided, select the type of information you want, and submit the query.

If you decide to use one of the DNS lookup tools, there are several tools you can use to do a name server lookup. Most of Windows versions come with the NSLOOKUP feature built it. If you have this tool, you will be able to use it via the command prompt.

Please, refer to this KB article for detailed instructions on the process

If the DNS lookup tool showed you updated DNS records, this does not mean that the whole propagation process is complete, as there may be other DNS servers that have not updated data. For more information read the Knowledge Base article on DNS propagation.