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What is the scope of the second IPv6 address fdee:de36:ce2c:0:174:d4b5:64b7:33f9 ? Netsh confirms that both are global/public. Is there any reason I get 2 global IPv6 addresses?

Wireless LAN adapter Wi-Fi:

Connection-specific DNS Suffix  . :
Description . . . . . . . . . . . : Dell Wireless 1395 WLAN Mini-Card
Physical Address. . . . . . . . . : 00-1F-E1-83-97-2A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2a02:2f07:6171:ce00:174:d4b5:64b7:33f9(Preferred)
IPv6 Address. . . . . . . . . . . : fdee:de36:ce2c:0:174:d4b5:64b7:33f9(Preferred)
Temporary IPv6 Address. . . . . . : 2a02:2f07:6171:ce00:78fc:b337:93ac:fb6b(Preferred)
Temporary IPv6 Address. . . . . . : fdee:de36:ce2c:0:78fc:b337:93ac:fb6b(Preferred)
Link-local IPv6 Address . . . . . : fe80::174:d4b5:64b7:33f9%3(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.122(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, April 12, 2015 12:29:05 AM
Lease Expires . . . . . . . . . . : Monday, April 13, 2015 3:20:04 PM
Default Gateway . . . . . . . . . : fe80::cab3:73ff:fe32:3dfa%3
                                    192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1

Update: Ok, fdee:de36:ce2c:0:174:d4b5:64b7:33f9 is definitely not a global IPv6 address, because it fails to connect to a remote address. But what is it? It's not a site-local either according to MSDN.

  • Use of site local IPv6 addresses was deprecated in 2004. It was deprecated because site local addresses suffer from addressing conflicts the same way RFC 1918 addresses do. – kasperd Apr 12 '15 at 18:49
  • You should check if your router announces that Unique Local Address prefix in addition to the global prefix. – Dubu Apr 13 '15 at 15:31
  • @Dubu Yes, it's advertised by the router along with the global prefix. – Chris Apr 14 '15 at 0:48
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The fdee:... addresses are part of the Unique Local Unicast allocation (fc00::/7).

These addresses are called Unique Local IPv6 Unicast Addresses and are abbreviated in this document as Local IPv6 addresses. They are not expected to be routable on the global Internet. They are routable inside of a more limited area such as a site. They may also be routed between a limited set of sites.


See IANA's Internet Protocol Version 6 Address Space for an overview of existing allocations.

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