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Subject: KERB_TICKET_CACHE_INFO_EX
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On windows XP and later, we have a new API called QueryTicketCacheEx,
this exposes the client realm correctly.  Does this meet your need? 

typedef struct _KERB_TICKET_CACHE_INFO_EX {
    UNICODE_STRING ClientName;
    UNICODE_STRING ClientRealm;
    UNICODE_STRING ServerName;
    UNICODE_STRING ServerRealm;
    LARGE_INTEGER StartTime;
    LARGE_INTEGER EndTime;
    LARGE_INTEGER RenewTime;
    LONG EncryptionType;
    ULONG TicketFlags;
} KERB_TICKET_CACHE_INFO_EX, *PKERB_TICKET_CACHE_INFO_EX;

PKERB_QUERY_TKT_CACHE_REQUEST and PKERB_QUERY_TKT_CACHE_EX_RESPONSE

typedef struct _KERB_QUERY_TKT_CACHE_EX_RESPONSE {
    KERB_PROTOCOL_MESSAGE_TYPE MessageType;
    ULONG CountOfTickets;
    KERB_TICKET_CACHE_INFO_EX Tickets[ANYSIZE_ARRAY];
} KERB_QUERY_TKT_CACHE_EX_RESPONSE, *PKERB_QUERY_TKT_CACHE_EX_RESPONSE;

typedef struct _KERB_TICKET_CACHE_INFO_EX {
    UNICODE_STRING ClientName;
    UNICODE_STRING ClientRealm;
    UNICODE_STRING ServerName;
    UNICODE_STRING ServerRealm;
    LARGE_INTEGER StartTime;
    LARGE_INTEGER EndTime;
    LARGE_INTEGER RenewTime;
    LONG EncryptionType;
    ULONG TicketFlags;
} KERB_TICKET_CACHE_INFO_EX, *PKERB_TICKET_CACHE_INFO_EX;