Final answer:
The first two hex digits of IPv6 Global Routing Prefixes typically range from 20 to 3F, corresponding to the binary pattern 001, which belongs to the Global Unicast Address space of 2000::/3 to 3FFF::/3.
Step-by-step explanation:
In the context of network addressing, specifically IPv6, the Global Routing Prefix is the portion of an IP address that is used to identify the network segment of the address and is designed for global route aggregation. This prefix is typically assigned by a global or regional internet registry. Regarding the specific question about the hex digits that Global Routing prefixes start with, it's important to note that the first two hex digits in an IPv6 address with a standard Global Unicast Address (GUA) formatting begin with the binary pattern 001, which corresponds to the hex range of 2000::/3 to 3FFF::/3. Therefore, the first two hex digits of Global Routing prefixes will usually be within the range of 20 to 3F.