1. A method comprises: generating a certificate signing request (CSR) that includes a certificate and a certificate extension, wherein the certificate includes information regarding a requesting device and wherein the certificate extension includes information regarding an accessible dispersed storage network (DSN) address range for the requesting device; outputting the CSR to a certificate authority of a DSN; receiving a signed certificate from the certificate authority, wherein the signed certificate includes a certification signature of the certificate authority authenticating the certificate and the certificate extension; and storing the signed certificate for use when generating a DSN access request, wherein the DSN access request is requesting access to dispersed storage error encoded data in the DSN at an address within the accessible DSN address range.