How many IP addresses are found in the header of an IP packet?

In the header of an IP packet, there are two IP addresses present: the source IP address and the destination IP address. The source IP address identifies the origin of the packet, while the destination IP address specifies where the packet should be sent. This structure is integral to how routing and communication across networks function.

Thus, the total count of IP addresses in the header is two, making this the correct choice. The presence of these two addresses allows routers and devices on a network to effectively direct packets to their intended destination and track where they originated from.