which countries fall under the jurisdiction of the international court of justiic, which ones do not and why?

Answer 1

The International Court of Justice (known colloquially as the World Court or ICJ; French: Cour internationale de Justice) is the primary judicial organ of the United Nations.
As stated in Article 93 of the UN Charter, all 192 UN members are automatically parties to the Court's statute. Non-UN members may also become parties to the Court's statute under the Article 93(2) procedure. For example, before becoming member nations, Switzerland used this procedure in 1948 to become a party; Nauru also became a party in 1988. Once a state is a party to the Court's statute, it is entitled to participate in cases before the Court. However, being a party to the statute does not automatically give the Court jurisdiction over disputes involving those parties. The issue of jurisdiction is considered in the two types of ICJ cases: contentious issues and advisory opinions.

Answer 2

Only those countries stupid enough to recognize it.

I hope sovereignty becomes fashionable again!