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Internet address
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... A records cause no additional section processing. The RDATA section
of an A line in a master file is an Internet address expressed as
four decimal numbers separated by dots without any embedded spaces
(e.g.,"10.2.0.52" or "192.0.5.6").
...
... services supported
by a particular protocol on a particular internet address. The
PROTOCOL field specifies an IP protocol number ...
...
The internet addresses of the two communicating parties for which the
link is being prepared.
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