ISn

ISN is an acronym that can refer to several different organizations and technical concepts depending on the field.

In medicine, ISN stands for the International Society of Nephrology, a global professional association for nephrologists and kidney health professionals. It coordinates research, education, and policy initiatives to improve kidney care worldwide and supports training programs, clinical guidelines, and global health projects.

In computer networking, ISN denotes the Initial Sequence Number used by the Transmission Control Protocol. The ISN is the starting value for the sequence numbers of bytes sent in a TCP connection and is chosen during the connection setup. Modern TCP implementations often use randomized ISNs to enhance security and reduce the risk of certain attacks.

In information security and related fields, ISN can refer to the International Security Network, a platform provided by ETH Zurich's Center for Security Studies. It delivers news, analysis, and country profiles on international security topics.