What are IP's 10.126.20.1 and 209.148.243.165 and why do they not respond to ping??

I have been trying to understand some issues in my internet connections.
If I do a traceroute to say, netflix.com I and get this rather long response:
The 10.0.1.1 is my airport and I can ping it successfully.
the 10.126.20.1 appears to be in my router, based on the IP, but it does not respond to a ping (timeout).
and
209.148.243.165 appears to be owned by Rogers cable, but also does not respond to a ping. The remainder seem more or less reasonable.
Can someone tell my if there is a reason the two above IP's do not respond to ping? Does this imply something is wrong in my part of the network?
I am a TSI customer who uses the common carrier services of Rogers Cable and I have been told my modem is faulty even though internet access, not withstanding the above questions, works well.
The modem is a Thomson DCM476. I am able to ping its IP, however the tracerout does not include the above IP's
Can someone please lead me in the right direction?
Thanks
Barry
traceroute to netflix.com (69.53.236.17), 64 hops max, 52 byte packets
1  10.0.1.1 (10.0.1.1)  1.262 ms  0.989 ms  0.701 ms
2  10.126.20.1 (10.126.20.1)  8.294 ms  7.886 ms  7.900 ms
3  209.148.243.165 (209.148.243.165)  10.543 ms  10.265 ms  11.780 ms
4  69.63.249.77 (69.63.249.77)  10.911 ms  11.223 ms  7.890 ms
5  ae0_2140-bdr04-tor.teksavvy.com (69.196.136.132)  9.884 ms
    ae0_2110-bdr04-tor.teksavvy.com (69.196.136.36)  20.773 ms  10.787 ms
6  ix-0-0-2-0.tcore1.tnk-toronto.as6453.net (64.86.33.21)  10.533 ms  9.450 ms  10.983 ms
7  if-5-0-0-5.core4.tnk-toronto.as6453.net (63.243.172.25)  65.523 ms
    if-0-0-0-4.core4.tnk-toronto.as6453.net (63.243.172.29)  12.200 ms  11.180 ms
8  if-0-1-2-0.tcore1.ct8-chicago.as6453.net (63.243.172.38)  25.885 ms  25.107 ms  25.536 ms
9  p5-1.ir1.chicago2-il.us.xo.net (206.111.2.33)  22.295 ms  23.455 ms  22.144 ms
10  207.88.14.193.ptr.us.xo.net (207.88.14.193)  82.020 ms  78.378 ms  79.484 ms
11  te-4-1-0.rar3.denver-co.us.xo.net (207.88.12.22)  80.880 ms  79.218 ms  79.740 ms
12  te-3-0-0.rar3.sanjose-ca.us.xo.net (207.88.12.58)  78.672 ms  78.702 ms  76.650 ms
13  ae0.cir1.sanjose2-ca.us.xo.net (207.88.13.73)  76.016 ms  76.863 ms  77.983 ms
14  216.156.85.46.ptr.us.xo.net (216.156.85.46)  77.971 ms  76.340 ms  95.172 ms
15  xe-2-2-0-954.jnrt-edge01.prod1.netflix.com (69.53.225.26)  76.076 ms  87.621 ms  76.976 ms
16  te1-8.csrt-agg01.prod1.netflix.com (69.53.225.6)  77.602 ms  77.353 ms  79.168 ms
17  netflixinc.com (69.53.236.17)  77.611 ms  77.480 ms  76.792 ms

One additional test is to use the 'whois' command in Terminal to gather additional information on each of the IP addresses that you get from using traceroute.
My guess at the 10.126.20.1 address is that this is indeed the IP address of your router on the WAN side ... and, as you surmised, it is being provided to your router by your ISP via the Thomsom modem. This looks like a case where the ISP has assigned you a "Public" IP address on their private network. That is, your router does NOT have a Public WAN IP address. This usually is not an issue unless you needed to run servers on your local network that required access from the Internet.
If you are sure that Rogers is supposed to provide you with a public WAN IP address, then either they are not or the modem is faulty as they have indicated.
The second IP address, in question, 209.148.243.165, is indeed, assigned to Rogers Cable. This may be one of their DNS servers for further routing of your traceroute command request.
BTW. It is NOT unusual for owners of networking devices on the Internet to block ping requests.

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