Question about 223/8

I'm confused about the argument I believe that went on not too long ago concerning 223/8. What documentation governs how IANA allocates address space, including special use space? The reason I ask is that I was perusing RFC 3330 and noted that it specifically stated that the basis for the reservation of 223.255.255.0/24 no longer applied and that the block was subject to future allocation to a RIR. Yet there was an argument about it. -Jack