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<p>In order to resolve who is, for example, accessing a server of illegal images on
the internet, a range of data needs to be retained by internet service providers.
The way that an internet service provider identifies their individual customers varies
from company to company, depending on how their systems work. An IP address can often
be shared by hundreds of people at once – in order to find out which device is accessing
the illegal content other data would be required, for example, port numbers (akin
to a house number where an IP address is akin to a post code) or MAC addresses (the
identifier of the particular computer).These are the types of data that may be used
to identify which "other identifier" belongs to the sender or recipient
of a communication. The purpose for which these data types are retained is strictly
limited by the clause to resolving the sender or recipient of an internet communication
– the shorthand for which is IP resolution.</p><p>The IP resolution clauses in the
Counter-terrorism and Security Bill will enable a device linked to an IP address to
be identified in many circumstances. However further data, excluded by the provisions
in this Bill, would be required to resolve them in all circumstances.</p><p> </p>
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