Definition: The term "ISTCNET" refers to an international standard for network connectivity between various computing systems, which was published in 2014 by IETF (Internet Engineering Task Force). It defines a set of protocols, services, standards, and best practices that define how networks are connected, enabling communication between devices over the internet. The "ISTCNET" is closely related to ISO/IEC 7816-3, which was published in 2009 by IETF.