Cannot filter using the isValidIp function in CloudWatch

Question

Hi

I'm currently experiencing issues when trying to use the "isValidIp" function for filtering logs in CloudWatch

```
fields @timestamp, StatusCode, RequestPath, @@m, isValidIp(Host),!(isValidIp(Host))
| filter !(isValidIp(Host))
```

I expect the query above to filter all logs where "Host" is not a valid IP address, but nothing is being filtered.
At the same time, I render `isValidIp(Host)` and `!(isValidIp(Host))` and see that these can clearly render the correct values for the function.

Is there some limitation or is my syntax incorrect?

Here is a link to a screenshot of the query and results: https://ibb.co/NSM8qM3

AWS-SA · Answer

I couldn't see the screenshot you shared, so I'm guessing a little here...

*IsValidIp* will return a boolean (true if valid), so I think you will need to use it in a condition in filter.

For example
```
| filter isValidIp(Host)
```
Hope that helps!

Cannot filter using the isValidIp function in CloudWatch

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