As he looked through the data once more, Force began to feel a little anxious. Citibank was a huge financial institution, dependent on the complete confidence of its customers. The corporation would lose a lot of face if news of Force's discovery got out. It might care enough to really come after him. Then, with the sudden clarity of the lightning strike photo which hung on his wall, a single thought filled his mind. I am playing with fire. `Where did you get those numbers?' Par asked Force next time they were both on Altos. Force hedged. Par leaped forward. `I checked those numbers for you. They're valid,' he told Force. The American was more than intrigued. He wanted that network address. It was lust. Next stop, mystery machine. `So, what's the address?' That was the one question Force didn't want to hear. He and Par had a good relationship, sharing information comfortably if occasionally. But that relationship only went so far. For all he knew, Par might have a less than desirable use for the information. Force didn't know if Par carded, but he felt sure Par had friends who might be into it. So Force refused to tell Par where to find the mystery machine. Par wasn't going to give up all that easily. Not that he would use the cards for free cash, but, hey, the mystery machine seemed like a very cool place to check out. There would be no peace for Force until Par got what he wanted. Nothing is so tempting to a hacker as the faintest whiff of information about a system he wants, and Par hounded Force until the Australian hacker relented just a bit. Finally Force told Par roughly where DEFCON had been scanning for addresses when it stumbled upon the CitiSaudi machine. Force wasn't handing over the street address, just the name of the suburb. DEFCON had been accessing the Citibank network through Telenet, a large American data network using X.25 communications protocols. The sub-prefixes for the Citibank portion of the network were 223 and 224. Par pestered Force some more for the rest of the numbers, but the Australian had dug his heels in. Force was too careful a player, too fastidious a hacker, to allow himself to get mixed up in the things Par might get up to. OK, thought the seventeen-year-old Par, I can do this without you. Par estimated there were 20000 possible addresses on that network, any one of which might be the home of the mystery machine. But he assumed the machine would be in the low end of the network, since the lower numbers were usually used first and the higher numbers were generally saved for other, special network functions. His assumptions narrowed the likely search field to about 2000 possible addresses.