> For the complete documentation index, see [llms.txt](https://docs.hyperdbg.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hyperdbg.org/commands/scripting-language/functions/memory/check_address.md).

# check\_address

### Function

> check\_address

### Syntax

> check\_address( Expression );

### Parameters

**\[Expression (Address)]**

A [MASM-like expression](https://docs.hyperdbg.org/commands/scripting-language/assumptions-and-evaluations) to evaluate which is the address of the target location to check.

### Description

Checks an address to see if the address is **valid** and **safe to access** from or not.

### Return value

If the address is valid and safe it returns `1`. If the address is invalid or not safe to access then it returns `0`.

### Examples

`IsValid = check_address(@rcx + 10);`

Adds 0x10 to the **rcx** register and checks whether it's a valid and safe address or not and safety and saves the result into `IsValid` variable.

`IsValid = check_address(dq(@rcx));`

Checks address as an 8-byte hex, pointed by **rcx** register and safety and saves the result into `IsValid` variable.

`IsValid = check_address(0xffff83811f265040);`

Checks `0xffff83811f265040` address for validity and safety and saves the result into `IsValid` variable.

You can also use this function with an **if** statement.

```c
if (check_address(@r11) == 1) 
{ 
    printf("address is valid.\n");
}
else 
{
    printf("address is invalid.\n");
}
```

### Remarks

None

### Related

None