OID value: 2.5.4.18
OID description:
The Post Office Box attribute type specifies
the Post Office Box by which the object will receive
physical postal delivery. If present, the attribute value
is part of the object's postal address.
postOfficeBox ATTRIBUTE ::= { WITH SYNTAX DirectoryString {ub-post-office-box} EQUALITY MATCHING RULE caseIgnoreMatch SUBSTRINGS MATCHING RULE caseIgnoreSubstringsMatch ID id-at-postOfficeBox }
See also the OID Repository website reference for 2.5.4.18