1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-----------------------------+-------------------------------+
|R|         Attribute Type      |            Length             |
+-+-----------------------------+---------------+---------------+
|       Service Priority        | Num Addresses |  ADN Length   |
+-------------------------------+---------------+---------------+
~                        IP Address(es)                         ~
+---------------------------------------------------------------+
~                  Authentication Domain Name                   ~
+---------------------------------------------------------------+
~                 Service Parameters (SvcParams)                ~
+---------------------------------------------------------------+