# getSlotNumber

Description: getSlotNumber cheatcode documentation

Note: This document was authored using MDX

  Source: https://github.com/NomicFoundation/hardhat-website/tree/main/src/content/docs/docs/reference/cheatcodes/Environment/get-slot-number.mdx

### Signature

```solidity
function getSlotNumber() external view returns (uint64 slotNumber);
```

### Description

Gets the current `block.slotnum`, the consensus-layer slot number that [EIP-7843](https://eips.ethereum.org/EIPS/eip-7843) exposes through the `SLOTNUM` opcode.

This cheatcode is only available from the [Amsterdam hardfork](/docs/reference/amsterdam-support#eip-7843-slotnum-opcode) onwards, and reverts on earlier hardforks.

### Examples

```solidity
vm.rollSlot(100);
assertEq(vm.getSlotNumber(), 100);
```

### SEE ALSO

- [rollSlot](/docs/reference/cheatcodes/environment/roll-slot)