I just saw this company today, when I looked up the external IP for a free VPN/TCP proxy server called Hotspot Shield. It was featured on TechCrunch recently. It's ad-supported and allows, say, Canadian users to watch streamed TV shows from U.S. television networks' websites, which limit their videos to U.S.-based IP addresses.
So, perhaps someone was using Hotspot Shield with the IP address 126.96.36.199 while visiting your website?
PSI (PSINet) was one of the "old school" tier 1 national ISPs along with UU.net, MCI, BBN, etc. I believe they filed chapter 11 around 2001 when many ISPs and CLEC telecoms fell hard in the first dot-com market crash. Obviously Cogent picked up the remnants.