support to the MSN ISP: Their internal communication network ( SITA-NET, IP range 57.0.0.0/8 ) was rendered publicly accessible for years by MSN (The Microsoft Network) ISP through the 800 (call for free) phone number which the users were to use to register an MSN account. The IP address which was assigned to the user during the MSN sign-up process was part of the SITA-NET.