Martian addresses are IP addresses from reserved or unallocated address blocks that should not appear as the source or destination address in packets on the public Internet. Routers are typically configured to drop packets containing these addresses. This includes private address ranges defined in RFC 1918 (e.g., 10.0.0.0/8), the loopback block (127.0.0.0/8), and other special-use ranges specified by IANA. Their filtering is a common security best practice to prevent spoofing and other network anomalies.

A. Routing between different routing tables is a function of virtual routing and forwarding (VRF) instances, not Martian addresses.

B. While private addresses are a type of Martian address, the term is broader and includes many other reserved ranges, making this answer incomplete.

D. Multicast addresses (224.0.0.0/4) are a category of special-use addresses, but the term "Martian" is not exclusive to them.

1. Juniper Networks. (2023). Junos OS Routing Protocols Library for Routing Devices. Section: "Martian Routes". "Martian routes are host or subnet addresses on which a router should not forward packets." The documentation lists default Martian addresses including 0.0.0.0/8

127.0.0.0/8

and 224.0.0.0/4.

2. Internet Engineering Task Force. (2013). RFC 6890: Special-Purpose IP Address Registries. Section 2.2. This document provides the IANA registry of special-purpose address blocks

many of which are considered "Martian" in a public routing context.

3. Internet Engineering Task Force. (1996). RFC 1918: Address Allocation for Private Internets. This RFC defines the private IPv4 address spaces that are not globally routable and are considered Martian addresses on the public Internet.