With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnAdminAddr
FORTINET Admin Address
1.3.6.1.4.1.12356.100.1.2.100.2.1.3
The address prefix identifying where the administrator account can be used from, typically an IPv4 address. The address type/format is determined by fnAdminAddrType.
Back to FORTINET-CORE-MIB MIB page.
IPHost Network monitor allows you to monitor fnAdminAddr on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet switches right now.