By default, forks are not shown in search results. You can choose to include them in repository searches, and in code searches if they meet certain criteria.

To show forks in repository search results, add fork:true or fork:only to your query.

Forks are only indexed for code search when they have more stars than the parent repository. You will not be able to search the code in a fork that has less stars than its parent. To show forks with more stars than the parent repository in code search results, add fork:true or fork:only to your query.

The fork:true qualifier finds all results that match your search query, including forks. The fork:only qualifier finds only forks that match your search query.

Qualifier Example
fork:true github fork:true matches all repositories containing the word "github," including forks.
android language:java fork:true matches code with the word "android" that's written in Java, in both forks and regular repositories.
fork:only github fork:only matches all fork repositories containing the word "github."
forks:>500 fork:only matches repositories with more than 500 forks, and only returns those that are forks.

Further reading