How do I go about checking to see if I am being blocked by a corporate website from visiting their site? Is there some way for me to determine if my IP address is on their block list? Thanks...

What's the website, and are you connecting from home, an educational institution or other? Life's more painless for the brainless.

If you are asking about a certain website blocking your IP, yes they can. THIS is just one example of how it works. i_XpUser

Thanks for the quick input. What I am really looking for is a way to test this theory...that I am being blocked. Is there some nifty little program that I could use or a technique to see if this is the case?

Yes, there are ways to *mostly* tell. No, they're not easy. For L3 filtering you could try an ICMP ping & see if you're blocked by IP addy...ICMP's could be filtered tho...could also try from a proxy to see if you're being blocked by source ip TCP connectivity could be checked by looking at responses to your SYN -- if SYN gets no RST then it's probably filtered & being dropped instead of replying with an RST...could also mean the host is just down... If you're blocked at HTTP level, then socket might open & then immediately close or could serve an HTTP 403. Bottom line is, I can't really tell you how to check this without going into pages and pages of details. You should download Wireshark, it's a good packet capture/analysis program. Study the protocols & try to make sense of what's actually happening.