how is WSL2 ip configured by itself?

[anlexN]

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 10.255.255.254/32 brd 10.255.255.254 scope global lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host proto kernel_lo
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:15:5d:13:81:e7 brd ff:ff:ff:ff:ff:ff
    altname enx00155d1381e7
    inet 172.29.43.111/20 brd 172.29.47.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::215:5dff:fe13:81e7/64 scope link proto kernel_ll
       valid_lft forever preferred_lft forever

How is 172.29.43.111/20 generated? why not 172.29.43.222/20 or others? I want know its internal theory. I have searched google, WSL docs, but found no anwsers.