Possible wrong validation for IPv4 on DomainNameUtil

I was looking at the email validator and noticed an issue with the DomainNameUtil. The IP address validation pattern is set to “[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}”.This accepts IP address like 999.999.999.999, which is not a valid IP. A more valid version could be ((25[0-5]|2[0-4]\d|[01]?\d\d?).){3}((25[0-5]|2[0-4]\d|[01]?\d\d?)), but not sure if this is something that should be fixed or not.

Yes, we are not very thorough in checking that because we think it does not have that much value.

Did you experience a real problem with it?