Zend certified PHP/Magento developer

Is 0.1.0.3 Local IP Address an IPV4 Loopback Address or Not?

Saw this when monitoring the network the other day and haven’t been able to figure out with certainty what it was for.

The application was the host process, it was inbound UDP traffic, the external IP was 34.170.99.197 (possibly a Google CDN?) the local port was 5355. and the remote port was 51641.

I haven’t seen this connection since but it looked suspicious to me. But I may just not realize that it’s commonly used / its purpose.

Any insight would be appreciated!