18.104.22.168 resolves to the IP block used by capitalnet.com.cn, a Chinese ISP tagetted at business. It could be a dialup account, or a small company, or... As to why they are spidering you, depends on your site.
In theory, yes. A robot is just a program running on a computer that can crawl webpages through http requests. It can run on a dial up from the computer it is on but that is not something any serious buisness would do :)