普通のホストで使うIPv4アドレスで一番マナーの良いものは223.255.255.255なのかしら?
https://ja.wikipedia.org/wiki/IP%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9#%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9%E3%82%AF%E3%83%A9%E3%82%B9
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