A Modify option should be available for all entries in the current address listing. Clicking Modify should display a form similar to adding a new entry, with all fields populated with the current information.
If the entry is a network address, only the description should be changeable. If the entry is a host IP address, sanity checks (such as whether the address is not duplicated or is within the valid network range) should be performed before the database row is updated with the new settings.
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