Please note, this is a known limitation.
Refer to developer CD documentation: (actual document version may vary depending on developer CD version)
sdkj_important_eR126.pdf page 35 under the heading "Obtain entire host name"
"Even if class InetAddress is used, host name of MFP/LP machine cannot be obtained."
A possible work around to this limitation is to use private MIB OID -if SNMP protocol is allowed-
Object name: ricohNetIfSrvCurrentHostName
OID is: 1.3.6.1.4.1.367.3.2.1.7.3.5.1.1.3.1.1
* Please review, current MIB as OID may have changed.
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