Why there are ip(ip) and domain(ip) ‘s difference and multi rows records in the traceroute?

In the traceroute command:

$ traceroute 104.43.54.2
traceroute to 104.43.54.2 (104.43.54.2), 64 hops max, 52 byte packets
 1  10.10.10.1 (10.10.10.1)  4.852 ms  4.623 ms  1.588 ms
 2  100.64.0.1 (100.64.0.1)  8.808 ms  10.895 ms  8.823 ms
 3  182.138.108.153 (182.138.108.153)  11.466 ms *  12.800 ms
 4  171.208.203.73 (171.208.203.73)  12.107 ms
    171.208.198.29 (171.208.198.29)  9.733 ms
    171.208.203.65 (171.208.203.65)  5.950 ms
 5  202.97.36.221 (202.97.36.221)  44.352 ms  45.386 ms  47.354 ms
 6  202.97.90.170 (202.97.90.170)  55.260 ms
    202.97.66.154 (202.97.66.154)  43.573 ms
    202.97.90.170 (202.97.90.170)  41.755 ms
 7  202.97.94.77 (202.97.94.77)  68.178 ms
    202.97.91.145 (202.97.91.145)  41.120 ms  38.737 ms
 8  202.97.57.81 (202.97.57.81)  54.497 ms  48.810 ms  48.332 ms
 9  202.97.121.198 (202.97.121.198)  74.393 ms  44.649 ms  41.414 ms
10  ae26-0.icr02.hkg31.ntwk.msn.net (104.44.236.209)  46.573 ms  49.441 ms  53.710 ms
11  ae25-0.hkb-96cbe-1b.ntwk.msn.net (104.44.236.206)  54.067 ms  45.355 ms  76.172 ms
12  ae36-0.sge-96cbe-1b.ntwk.msn.net (104.44.224.255)  73.793 ms  97.979 ms  81.148 ms
13  ae18-0.sge-96cbe-1a.ntwk.msn.net (104.44.226.168)  80.137 ms  74.344 ms
    ae38-0.icr02.sg2.ntwk.msn.net (104.44.236.146)  73.529 ms
14  * ae28-0.icr01.sg2.ntwk.msn.net (104.44.236.136)  115.877 ms  92.173 ms
15  * * *
16  * * *
17  * * *
18  * *

I have some questions about the shows,

1) What's the difference between 171.208.203.65 (171.208.203.65) and ae38-0.icr02.sg2.ntwk.msn.net (104.44.236.146)? one is ip(ip) and the other is domain(ip).

2) in the 4, 6, 7, and 13, there are two rows of records :

13  ae18-0.sge-96cbe-1a.ntwk.msn.net (104.44.226.168)  80.137 ms  74.344 ms
    ae38-0.icr02.sg2.ntwk.msn.net (104.44.236.146)  73.529 ms 

why?

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