The network designer needs to use GLOP IP address in order make them unique within their ASN, which multicast address range will be considered?

The 239.0.0.0/8 range is the Administratively Scoped multicast address space defined in RFC 2365, intended for private organizational use within a defined scope boundary, not for globally unique ASN-based addressing.

The 224.0.0.0/24 range contains Well-Known link-local multicast addresses reserved by IANA for routing protocols such as OSPF (224.0.0.5) and EIGRP (224.0.0.10), and is not available for GLOP allocation.

The 233.0.0.0/8 range is specifically designated for GLOP addressing per RFC 3180, where the two middle octets (233.X.Y.0/24) are derived from the organization's registered 16-bit ASN, guaranteeing global uniqueness without requiring central allocation. For example, ASN 1000 (0x03E8) maps to the block 233.3.232.0/24, allowing any organization with an ASN to derive its own unique multicast space.

The 232.0.0.0/8 range is reserved for Source-Specific Multicast (SSM) as defined in RFC 4607, where receivers subscribe to traffic from a specific source address, which is an entirely different multicast model.