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I am detecting an unknown IP address on my home LAN network. Can someone explain to me why might this be?

IP list

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Does it match your public IP? –  gronostaj Jul 20 '13 at 16:24
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The 100.64.0.0/10 (100.64.0.0 – 100.127.255.255) space is set aside for Carrier Grade NAT, as defined in RFC 6598. This is likely the external interface of your router. Nothing to worry about.

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