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trace route shows private IP range after router

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I don't understand why trace route is showing 10.x.x.x (entire address range is private, right?) after the router, which goes to a pass-thru cable modem. How can this be?

Tracing route to cnn.com []
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms RT-AC68P-D9B8 []
2 20 ms 18 ms 20 ms
3 21 ms 19 ms 20 ms <-- my ISP's address block
4 25 ms 34 ms 28 ms
5 25 ms 27 ms 37 ms
6 28 ms 27 ms 34 ms 68-66-73-220.client.mchsi.com []
7 27 ms 27 ms 26 ms po10.atlga001er1.mchsi.com []
8 25 ms 25 ms 27 ms
9 30 ms 16 ms 13 ms
Right, I didn't closely look at the 172.x address. Those hops really surprise me - didn't realize that kind of thing happened. Thank you.
Private IP 1st hop after your router means most likely you have a PPPoE connection.
I would say impossible without PPPoE and a public IP (no CGNAT)

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