try IPCONFIG /all in your command prompt if you find too many tunnel adapter 6to4 entries you need to read this article

Today I was working on my laptop doing some scripting in python that involved to get mac address.. I discovered around 186+ entries saying
Tunnel adapter Local Area Connection* 197:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft 6to4 Adapter #18
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

So I decided to figure out what this is since this doesnt seem to be my Ethernet LAN card that I use to connect to internet.

Well I found so many people had this problem, and smarty me got the solution so quickly. I will not go in depth since then it would be redundant post/article on the web. Their are so many articles and discussion for the solution (applies to windows vista, 7):

Here are few links I found useful from where i got rid of entries:

1. http://answers.microsoft.com/en-us/.../windows_7-networking/tunnel
2. http://social.technet.microsoft.com/Forums/en-US/itprovistanetworking
3. http://ryanvictory.com/.../automating-6to4-adapter-removal-in-windows/
4. http://techontip.wordpress.com/....-tune-windows-..-r2-networking-config
5. http://www.techsupportforum.com/forums/f217/solved-ipconfig-shows
   

Solution:(if you trust me and if you don't want to read the long post in the links above)
I take no responsibility if anything goes wrong with your pc, I have only followed what was mentioned in above links.
The Tunnel adapter Local Area Connection entries are automatically created depending of the IPv4 range.

One way to prevent 6to4 to be automatically created is to use the following command in the command prompt:

Microsoft ISATAP  stands for inter site automatic tunneling address protocol. And ISATAP adapter helps to encapsulate IPv6 packets inside IPv4 header. This helps in IPv4 to v6 transition easily. Either you can use below command line to disable ISATAP or you may like to disable IPv6 completely using registry key, which will disable all related stuff in your machine.

This will disable its automatic creation, you don't need this if your organization is not going to migrate the internal network to IPv6.

Now lets get rid of the entries. If they are not many like less than 10 or so, you can do it from Device Manager, show hidden devices and then under Network adapters you will find all these. uninstall all of these entries one by one, but if you want to do it all automatically, I used it and got rid of it. here is a link to download. It includes a version for x64 and for x86 as well. It also includes instruction in readme.txt that you should read.

Download it here. 6to4remover

and run it according to instruction in readme text file.

To see what you get after executing the 6to4remover.exe & post comments click read more

Here is what you get once getting removed.

6to4 Adapter removal tool Author: Pcsor.com Beginning devcon ROOT\*6TO4MP\0160                                           : Removed ROOT\*6TO4MP\0109                                           : Removed ROOT\*6TO4MP\0058                                           : Removed ROOT\*6TO4MP\0007                                           : Removed ROOT\*6TO4MP\0186                                           : Removed ROOT\*6TO4MP\0135                                           : Removed ROOT\*6TO4MP\0084                                           : Removed ROOT\*6TO4MP\0033                                           : Removed ROOT\*6TO4MP\0161                                           : Removed ROOT\*6TO4MP\0110                                           : Removed ROOT\*6TO4MP\0059                                           : Removed ROOT\*6TO4MP\0008                                           : Removed ROOT\*6TO4MP\0187                                           : Removed ROOT\*6TO4MP\0136                                           : Removed ROOT\*6TO4MP\0085                                           : Removed ROOT\*6TO4MP\0034                                           : Removed ROOT\*6TO4MP\0162                                           : Removed ROOT\*6TO4MP\0111                                           : Removed ROOT\*6TO4MP\0060                                           : Removed ROOT\*6TO4MP\0009                                           : Removed ROOT\*6TO4MP\0188                                           : Removed ROOT\*6TO4MP\0137                                           : Removed ROOT\*6TO4MP\0086                                           : Removed ROOT\*6TO4MP\0035                                           : Removed ROOT\*6TO4MP\0163                                           : Removed ROOT\*6TO4MP\0112                                           : Removed ROOT\*6TO4MP\0061                                           : Removed ROOT\*6TO4MP\0010                                           : Removed ROOT\*6TO4MP\0189                                           : Removed ROOT\*6TO4MP\0138                                           : Removed ROOT\*6TO4MP\0087                                           : Removed ROOT\*6TO4MP\0036                                           : Removed ROOT\*6TO4MP\0164                                           : Removed ROOT\*6TO4MP\0113                                           : Removed ROOT\*6TO4MP\0062                                           : Removed ROOT\*6TO4MP\0011                                           : Removed ROOT\*6TO4MP\0190                                           : Removed ROOT\*6TO4MP\0139                                           : Removed ROOT\*6TO4MP\0088                                           : Removed ROOT\*6TO4MP\0037                                           : Removed ROOT\*6TO4MP\0165                                           : Removed ROOT\*6TO4MP\0114                                           : Removed ROOT\*6TO4MP\0063                                           : Removed ROOT\*6TO4MP\0012                                           : Removed ROOT\*6TO4MP\0191                                           : Removed ROOT\*6TO4MP\0140                                           : Removed ROOT\*6TO4MP\0089                                           : Removed ROOT\*6TO4MP\0038                                           : Removed ROOT\*6TO4MP\0166                                           : Removed ROOT\*6TO4MP\0115                                           : Removed ROOT\*6TO4MP\0064                                           : Removed ROOT\*6TO4MP\0013                                           : Removed ROOT\*6TO4MP\0192                                           : Removed ROOT\*6TO4MP\0141                                           : Removed ROOT\*6TO4MP\0090                                           : Removed ROOT\*6TO4MP\0039                                           : Removed ROOT\*6TO4MP\0167    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                  : Removed ROOT\*6TO4MP\0041                                           : Removed ROOT\*6TO4MP\0169                                           : Removed ROOT\*6TO4MP\0118                                           : Removed ROOT\*6TO4MP\0067                                           : Removed ROOT\*6TO4MP\0016                                           : Removed ROOT\*6TO4MP\0195                                           : Removed ROOT\*6TO4MP\0144                                           : Removed ROOT\*6TO4MP\0093                                           : Removed ROOT\*6TO4MP\0042                                           : Removed ROOT\*6TO4MP\0170                                           : Removed ROOT\*6TO4MP\0119                                           : Removed ROOT\*6TO4MP\0068                                           : Removed ROOT\*6TO4MP\0017                                           : Removed ROOT\*6TO4MP\0196                                           : Removed ROOT\*6TO4MP\0145                                           : Removed ROOT\*6TO4MP\0094                                           : Removed ROOT\*6TO4MP\0043                                           : Removed ROOT\*6TO4MP\0171                                           : Removed ROOT\*6TO4MP\0120                                           : Removed ROOT\*6TO4MP\0069                                           : Removed ROOT\*6TO4MP\0018                                           : Removed ROOT\*6TO4MP\0197                                           : Removed ROOT\*6TO4MP\0146                                           : Removed ROOT\*6TO4MP\0095                                           : Removed ROOT\*6TO4MP\0172                                           : Removed ROOT\*6TO4MP\0121                                           : Removed ROOT\*6TO4MP\0070                                           : Removed ROOT\*6TO4MP\0019                                           : Removed ROOT\*6TO4MP\0198                                           : Removed ROOT\*6TO4MP\0147                                           : Removed ROOT\*6TO4MP\0096                                           : Removed ROOT\*6TO4MP\0045                                           : Removed ROOT\*6TO4MP\0173                                           : Removed ROOT\*6TO4MP\0122                                           : Removed ROOT\*6TO4MP\0071                                           : Removed ROOT\*6TO4MP\0020                                           : Removed ROOT\*6TO4MP\0148                                           : Removed ROOT\*6TO4MP\0097                                           : Removed ROOT\*6TO4MP\0046                                           : Removed ROOT\*6TO4MP\0174                                           : Removed ROOT\*6TO4MP\0123                                           : Removed ROOT\*6TO4MP\0072                                           : Removed ROOT\*6TO4MP\0021                                           : Removed ROOT\*6TO4MP\0149                                           : Removed ROOT\*6TO4MP\0098                                           : Removed ROOT\*6TO4MP\0047                                           : Removed ROOT\*6TO4MP\0175                                           : Removed ROOT\*6TO4MP\0124                                           : Removed ROOT\*6TO4MP\0073                                           : Removed ROOT\*6TO4MP\0022                                           : Removed ROOT\*6TO4MP\0150                                           : Removed ROOT\*6TO4MP\0099                                           : Removed ROOT\*6TO4MP\0048                                           : Removed ROOT\*6TO4MP\0176                                           : Removed ROOT\*6TO4MP\0125                                           : Removed ROOT\*6TO4MP\0074                                           : Removed ROOT\*6TO4MP\0023                                           : Removed ROOT\*6TO4MP\0100                                           : Removed ROOT\*6TO4MP\0049                                           : Removed ROOT\*6TO4MP\0177                                           : Removed ROOT\*6TO4MP\0126                                           : Removed ROOT\*6TO4MP\0075                                           : Removed ROOT\*6TO4MP\0024                                           : Removed ROOT\*6TO4MP\0152                                           : Removed ROOT\*6TO4MP\0101                                           : Removed ROOT\*6TO4MP\0050                                           : Removed ROOT\*6TO4MP\0178                                           : Removed ROOT\*6TO4MP\0127                                           : Removed ROOT\*6TO4MP\0076                                           : Removed ROOT\*6TO4MP\0025                                           : Removed ROOT\*6TO4MP\0153                                           : Removed ROOT\*6TO4MP\0102                                           : Removed ROOT\*6TO4MP\0051                                           : Removed ROOT\*6TO4MP\0000                                           : Removed ROOT\*6TO4MP\0179                                           : Removed ROOT\*6TO4MP\0128                                           : Removed ROOT\*6TO4MP\0077                                           : Removed ROOT\*6TO4MP\0026                                           : Removed ROOT\*6TO4MP\0154                                           : Removed ROOT\*6TO4MP\0103                                           : Removed ROOT\*6TO4MP\0052                                           : Removed ROOT\*6TO4MP\0001                                           : Removed ROOT\*6TO4MP\0180                                           : Removed ROOT\*6TO4MP\0129                                           : Removed ROOT\*6TO4MP\0078                                           : Removed ROOT\*6TO4MP\0027                                           : Removed ROOT\*6TO4MP\0155                                           : Removed ROOT\*6TO4MP\0104                                           : Removed ROOT\*6TO4MP\0053                                           : Removed ROOT\*6TO4MP\0002                                           : Removed ROOT\*6TO4MP\0181                                           : Removed ROOT\*6TO4MP\0130                                           : Removed ROOT\*6TO4MP\0079                                           : Removed ROOT\*6TO4MP\0028                                           : Removed ROOT\*6TO4MP\0156                                           : Removed ROOT\*6TO4MP\0105                                           : Removed ROOT\*6TO4MP\0054                                           : Removed ROOT\*6TO4MP\0003                                           : Removed ROOT\*6TO4MP\0182                                           : Removed ROOT\*6TO4MP\0131                                           : Removed ROOT\*6TO4MP\0080                                           : Removed ROOT\*6TO4MP\0029                                           : Removed ROOT\*6TO4MP\0157                                           : Removed ROOT\*6TO4MP\0106                                           : Removed ROOT\*6TO4MP\0055                                           : Removed ROOT\*6TO4MP\0004                                           : Removed ROOT\*6TO4MP\0183                                           : Removed ROOT\*6TO4MP\0132                                           : Removed ROOT\*6TO4MP\0081                                           : Removed ROOT\*6TO4MP\0030                                           : Removed ROOT\*6TO4MP\0158                                           : Removed ROOT\*6TO4MP\0107                                           : Removed ROOT\*6TO4MP\0056                                           : Removed ROOT\*6TO4MP\0005                                           : Removed ROOT\*6TO4MP\0184                                           : Removed ROOT\*6TO4MP\0133                                           : Removed ROOT\*6TO4MP\0082                                           : Removed ROOT\*6TO4MP\0031                                           : Removed ROOT\*6TO4MP\0159                                           : Removed ROOT\*6TO4MP\0108                                           : Removed ROOT\*6TO4MP\0057                                           : Removed ROOT\*6TO4MP\0006                                           : Removed ROOT\*6TO4MP\0185                                           : Removed ROOT\*6TO4MP\0134                                           : Removed ROOT\*6TO4MP\0083                                           : Removed ROOT\*6TO4MP\0032                                           : Removed 197 device(s) removed. ROOT\*ISATAP\0000                                           : Removed ROOT\*ISATAP\0001                                           : Removed 2 device(s) removed.