Ever since its founding in 1925 the “headquarters” of the IARUhas been provided by the ARRL, the national association for amateur radio in the United States. Under the current IARUConstitution this function is called the International Secretariat. The ARRLis the largest of the IARUmember-societies and has the largest full-time staff, and so is in the best position to provide continuity and funding.

The mailing address of the International Secretariat is P​.​O. Box 310905, Newington, CT06131 – 0905 USA. The physical address is that of ARRLHeadquarters: 225 Main Street, Newington, CT06111 USA. Email: iaru@​iaru.​org.

The IARUConstitution and Bylaws set out the procedure for the selection of another member-society to serve as the International Secretariat should that become necessary or desirable.