# IERC165

*Interface of the ERC165 standard, as defined in the <https://eips.ethereum.org/EIPS/eip-165\\[EIP>]. Implementers can declare support of contract interfaces, which can then be queried by others ({ERC165Checker}). For an implementation, see {ERC165}.*

## Methods

### supportsInterface

```solidity
function supportsInterface(bytes4 interfaceId) external view returns (bool)
```

*Returns true if this contract implements the interface defined by `interfaceId`. See the corresponding <https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified\\[EIP> section] to learn more about how these ids are created. This function call must use less than 30 000 gas.*

#### Parameters

| Name        | Type   | Description |
| ----------- | ------ | ----------- |
| interfaceId | bytes4 | undefined   |

#### Returns

| Name | Type | Description |
| ---- | ---- | ----------- |
| \_0  | bool | undefined   |