@Nullable
    public String getMultiUserChatSubdomain(final long serviceID) {
        return loadServiceSubdomain(serviceID);
    }
Retrieves the subdomain of a specified service ID.

@param serviceID ID of service to get subdomain of.
@return Subdomain of MUC service, or null if none found.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MultiUserChatManager.java