A Martian packet is an IP packet seen on the public Internet that contains a source or destination address that is reserved for special use by the Internet Assigned Numbers Authority (IANA) as defined in RFC 1812, Appendix B Glossary (Martian Address Filtering).
Martian packets commonly arise from IP address spoofing in denial-of-service attacks,[2] but can also arise from network equipment malfunction or misconfiguration of a host.
[1] In Linux terminology, a Martian packet is an IP packet received by the kernel on a specific interface, while routing tables indicate that the source IP is expected on another interface.
Because 6to4 relays use the encoded value for determining the end site of the 6to4 tunnel, 6to4 addresses corresponding to IPv4 Martians are not routable and should never appear on the public Internet.
Thus there is no definable set of prefixes more specific than 2001:0::/32 for Teredo packets with Martian end-site addresses.