sentences:  In less than 15 minutes the crawler found the IP address of the Gnucleus client in NYU with the unique port.If a user is connected to the Gnutella network within, say, the last 24 hours, that user's IP address can be easily harvested by hackers, since the HTTP monitoring feature can collect about 300,000 unique addresses within 10 hours.A Globally unique identifier (GUID) is a 16 bytes field in the Gnutella message header, which uniquely identifies every Gnutella message.