Strange IP using my internet

I am always monitoring my internet usage on QoS so I can play online without my family messing around my ping. : D

But since today I've seen a very strange IP using my connection: 40.4.4.49
In the Connected Devices Map only shows my PC.My PC is on cable, so I deactivated the wifi but this IP continues to use the network.

My IP distribution: 192.168.1.30 - 192.168.1.80

And there are also numbers and letters that have never been on IPv6

Networks driver up to date.

What can it be?

Additional Information:

So it seems like this IP is me!

My IP on modem is: 192.168.1.30

With only my PC connected on the Net, when I'm browsing I have data usage on both IPs: 192.168.1.30 and 40.4.4.49
If I use all my band, that is of 8Mbps (800kbp/s) making a download in the Windows Store, the use of data divides between the two IPs, always reaching the maximum, sometimes more in one than in the other.
Task Manager shows maximum network usage: 7.9 mbps (790kbps)

If I watch a video on YT, download some torrent on full speed, or even do a speed test on speedtest.net all the data usage stays with 192.168.1.30

In Idle is the same use it was before.

One more thing, this morning my Windows 10 install some updates, I don't know if this is the consequence of this update.

P.S. Sorry my bad english

Eli Lily owns that IP. A simple search would show you. As for the IP for that device on your network, that depends on if you are running a VPN or proxy at the time.

Here in the UK, Virginmedia have implemented free wifi via their Superhub 3, it broadcasts a wifi signal separate to the users wifi which other VM users can access, I'm wondering if your supplier in Brazil has done something similar.
It also could be that your router has been hacked.