Hello!
Currently I am working on bug #74699 (Thanks brianlmoon for pointing this 
issue).

Here is some details:
In patch applied for bug #72972 IP address block 240.0.0.0/4 has been removed 
from list of reserved.

But according to IP Multicast Address Specification:
“The range of addresses between 224.0.0.0 and 224.0.0.255, inclusive,
is reserved for the use of routing protocols and other low-leveltopology 
discovery or maintenance protocols, 
such as gateway discoveryand group membership reporting.  
Multicast routers should not forwardany multicast datagram with destination 
addresses in this range,regardless of its TTL.”

Here is the full specification: 
https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml

That’s why my PR introducing changes to include addresses between 224.0.0.0 and 
224.0.0.255 in list of reserved.
Here is link to my PR
https://github.com/php/php-src/pull/2562

Thanks!
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