lucy24 - 11:42 pm on Jan 31, 2013 (gmt 0)
Careful with the bings. They've been moving into all kinds of obscure new IPs. (Apparently they missed the early-90s /8 handout by about five minutes, so they have to grab IPs where they can find them.) If it's an unfamiliar range and the visitor begins by asking for robots.txt, it may be worth looking them up.