OID value: 1.3.6.1.2.1.1.4
OID description:
sysContact OBJECT-TYPE SYNTAX DisplayString (SIZE (0..255)) ACCESS read-write STATUS mandatory DESCRIPTION "The textual identification of the contact person for this managed node, together with information on how to contact this person." ::= { system 4 }
See also the OID Repository website reference for 1.3.6.1.2.1.1.4