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        .network_address: IPv6Address('2001:db8::1000')
        .hostmask: IPv6Address('::f')
        .broadcast_address: IPv6Address('2001:db8::100f')
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        .prefixlen: 124

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              '2001:db8::'
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            strict: A boolean. If true, ensure that we have been passed
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            ValueError: If strict was True and a network address was not
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