In output of
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 1552397 bytes 88437726 (88.4 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1552397 bytes 88437726 (88.4 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
netmask 255.0.0.0 indicate the network is
127.0.0.0/8, and consists many IP addresses
prefixlen 128 indicates the network has just one IP address. (https://networkengineering.stackexchange.com/a/57868/7894 seems to me that prefixlen specifies a network mask for IPv6)
Do they describe the same network?
Is a network defined as a set of IP addresses (therefore difference between IPv4 and IPv6 addresses can lead to different networks), or a set of network interfaces (therefore IPv4 and IPv6 addresses won't make difference, since they are assigned to the same network interfaces)?