OID value: 1.3.6.1.2.1.1.3
OID description:
sysUpTime OBJECT-TYPE SYNTAX TimeTicks ACCESS read-only STATUS mandatory DESCRIPTION "The time (in hundredths of a second) since the network management portion of the system was last re-initialized." ::= { system 3 }
See also the OID Repository website reference for 1.3.6.1.2.1.1.3