JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Every form submission have a unique submission ID, you can check that from the submission report page.
You can also use Unique ID widget that would allow you to set any format that you have in your own system and allow you to add up from a certain number as reference number.
For example, if the reference numbers in your system are starting with 2000 you can set it up to start from that number as well and it would go up by one per each new submission made.
If you want something else, or need further assistance, feel free to revert back.