網際協定位址(Internet Protocol Address),數碼也,所以辨網上算機。其類有二:曰網協四(IPv4),曰網協六(IPv6)。
其常易者,稱網協浮址(Dynamic IP);不易者乃網協固址(Static IP)。網協虛址(Virtual IP)見於內網;網協實址(Physical IP)見於互聯網。復有迴環(Loopback)址,算機所以自尋也。
夫網協四以四數記址。昔人見其址有限,而用者益眾,遂定網協六,以八數記址。
公元二〇一九年,網協四所定址盡爲所用,今無餘矣。
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