IP Restrictions Scanner (IRS)
Many servers and network devices like routers and switches provides features like ACLs, IP Filters, Firewall rules and so on to give access to their Services only to particular IP addresses (usually Administrator's workstations). The main purpose of this program is to find out IP restrictions that have been set for a particular service on a host. It combines "ARP Poisoning" and "Half-Scan" techniques and tries totally spoofed TCP connections to the selected port of the target. IRS does not scan for opened ports but for valid IP source addresses allowed to connect.