sudo net ads keytab add nfs -U Administrator
Enter Administrator's password:

sudo net ads keytab list
Vno  Type                                        Principal
  6  des-cbc-crc                                 host/ubnfs01.example.com@EXAMPLE.COM
  ...
  6  arcfour-hmac-md5                            UBNFS01$@EXAMPLE.COM
  6  des-cbc-crc                                 nfs/ubnfs01.example.com@EXAMPLE.COM
  ...
  6  arcfour-hmac-md5                            nfs/ubnfs01@EXAMPLE.COM