FREE TOOL
4byte Function Signature Lookup
Look up Ethereum function signatures by their 4-byte selector, or search signatures by name. Uses the 4byte.directory database and client-side keccak256 hashing.
Technical FAQ
What is a 4-byte function selector?
Where does the signature data come from?
Can multiple functions have the same selector?
How do I compute a selector for my own function?
Ready to launch your explorer?
Deploy a fully-featured block explorer for your EVM chain in under 5 minutes. No credit card required.