ARDC, the Amateur Radio Digital Communications corporation, is a non-profit California corporation that owns network 44 (188.8.131.52/9 and 184.108.40.206/10), known as the AMPRNet. It was formed to encourage and foster the development of the Amateur Radio packet and other amateur radio digital networking. You may contact ARDC by sending email to firstname.lastname@example.org.
Note that ARDC is not an Internet Service Provider. It does not provide any networking access or facilities. It solely manages and allocates Internet address space, subnets of network 44 (AMPRNet), to interested Amateur Radio operators. Persons who obtain an allocation of address space on AMPRNet must make their own arrangements for connectivity and Internet service.