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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
'UDP'.
@ivar host: A string containing a dotted-quad IPv4 address; for example,
"127.0.0.1".
@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.
@ivar type: A string describing the type of transport, either 'TCP' or
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@ivar host: A string containing a colon-separated, hexadecimal formatted
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
interface traffic destined for this address must be transmitted over.
@type scopeID: L{int} or L{str}
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An L{interfaces.IAddress} provider for process transports.
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A L{HostnameAddress} represents the address of a L{HostnameEndpoint}.
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@type hostname: L{bytes}
@ivar port: An integer representing the port number.
@type port: L{int}
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Object representing a UNIX socket endpoint.
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