The Internet Control Message Protocol (ICMP) is one of the core protocols of the
Internet Protocol (IP) Suite. It is chiefly used by the operating systems of networked
computers to send error messages indicating, for example, that a requested service
is not available or that a host or router could not be reached. We limit the number
of ports we scan for non-registered user. To learn more about our full UDP port
scanning services click:
Full Port Scan Monitoring Service.