Protocol 41
Protocol 41 is a communication protocol which embeds internet protocol version 6 (IPv6) packets inside Internet protocol version 4 (IPv4) packets as defined in RFC 2473. It is usually used to allow a computer or router with only an IPv4 address to obtain an IPv6 address (or maybe more than one address, to serve more than one computer). Most IPv6 tunnel providers support Protocol 41, including Hurricane Electric. 6to4, 6rd, and 6in4 are all different ways of using Protocol 41. Protocol 41 does not use TCP or UDP (although the IPv6 packets inside can carry TCP and UDP traffic). It is not to be confused with TCP or UDP port number 41.
6to4
6to4 is a special usage of protocol 41. A 6to4 address starts with the digits 2002, followed by the IPv4 address of its router. A 6to4 address might look like: 2002:CB00:71FF:0:fe64:3486:d398:3346
Protocol 41 Media
Artist's conception of a protoplanetary disk
Pierre-Simon Laplace, one of the originators of the nebular hypothesis
Hubble image of protoplanetary discs in the Orion Nebula, a stellar nursery approximately 25 ly across and estimated to be similar to the primordial nebula from which the Sun formed
Illustration of a protoplanetary disk that would have surrounded the Sun.
Meteor Crater in Arizona. Created 50,000 years ago by an impactor about 50 metres (160 ft) across, it shows that the accretion of the Solar System is not over.
Artist's conception of the giant impact thought to have formed the Moon
Neptune and its moon Triton, taken by Voyager 2. Triton's orbit will eventually take it within Neptune's Roche limit, tearing it apart and possibly forming a new ring system.
Relative size of the Sun as it is now (inset) compared to its estimated future size as a red giant
The Ring Nebula, a planetary nebula similar to what the Sun will become
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