The "GLOP" address space (not an acronym) is a way to assign addresses based on an autonomous system number, as described in RFC 2770. Basically, a /24 is assigned to each Autonomous System based on the 16 bit Autonomous System Number (ASN). For a given ASN number, converted into two octets (say X and Y) in the usual fashion of Internet addresses, the GLOP space is therefore 233.X.Y/24. This address range is assumed to be assigned by default and does not have to be explicitly requested. Note, however, that a GLOP allocation only provides 256 separate addresses, which is widely viewed as not enough for large scale broadcasters. There are no restrictions on your GLOP space.