See [here](https://github.com/apache/trafficserver/blob/3fc04c4590d7e47ba648b06f973c874d6ff900fc/lib/ts/ink_inet.cc#L465) where we similarly shift 4 bits.
This is intended to compare `224.0.0.0/4`, the high 4 bits of an IPv4 [multicast address](https://en.wikipedia.org/wiki/Multicast_address#IPv4). [ Full content available at: https://github.com/apache/trafficserver/pull/4151 ] This message was relayed via gitbox.apache.org for [email protected]
