# IERC165

# Functions

Query if a contract implements an interface

Interface identification is specified in ERC-165. This function uses less than 30,000 gas.

function supportsInterface(bytes4 interfaceId) external view returns (bool);

Parameters

Name	Type	Description
`interfaceId`	`bytes4`	The interface identifier, as specified in ERC-165

Returns

Name	Type	Description
`<none>`	`bool`	`true` if the contract implements `interfaceID` and `interfaceID` is not 0xffffffff, `false` otherwise