[9dev]

Also, many people don’t remember that those zeros in between numbers in IPs can be slashed, so pinging 127.1 works fine. This is also the reason why my home network is a 10.0.0.0/24—don’t need the bigger address space, but reaching devices at 10.1 sure is convenient!

[diggan]

I had no idea about this, and been computing for almost 20 years now, thanks!

Trying to get ping to ping `0.0.0.0` was interesting

    $ ping -c 1 ""
    ping: : Name or service not known

    $ ping -c 1 "."
    ping: .: No address associated with hostname

    $ ping -c 1 "0."
    ^C

    $ ping -c 1 ".0"
    ping: .0: Name or service not known

    $ ping -c 1 "0"
    PING 0 (127.0.0.1) 56(84) bytes of data.
    64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.028 ms

    $ ping -c 1 "0.0"
    PING 0.0 (127.0.0.1) 56(84) bytes of data.
    64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.026 ms

[immibis]

0.0.0.0 is a reserved address to mean "this device". Also, 0/8 is a reserved subnet to mean "this network" (which no-one uses any more). I wouldn't have expected ping to substitute 127.0.0.1, but it's not that weird either.