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Address objects for network connections.
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An L{IPv4Address} represents the address of an IPv4 socket endpoint.
@ivar type: A string describing the type of transport, either 'TCP' or
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@ivar host: A string containing a dotted-quad IPv4 address; for example,
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@type host: C{str}
@ivar port: An integer representing the port number.
@type port: C{int}
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An L{IPv6Address} represents the address of an IPv6 socket endpoint.
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IPv6 address; for example, "::1".
@type host: C{str}
@ivar port: An integer representing the port number.
@type port: C{int}
@ivar flowInfo: the IPv6 flow label. This can be used by QoS routers to
identify flows of traffic; you may generally safely ignore it.
@type flowInfo: L{int}
@ivar scopeID: the IPv6 scope identifier - roughly analagous to what
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@type scopeID: L{int} or L{str}
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A L{HostnameAddress} represents the address of a L{HostnameEndpoint}.
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