Freenet servers can (and, AFAIK, routinely are) be blocked by IP.
This appears to be wrong. I haven’t used Freenet myself (yet), but it doesn’t seem to have servers at all, or admit IP blocking. In this it appears to be analogous to the hidden services (.onion sites) in Tor. And protocol analysis tools (packet sniffers) would appear to be irrelevant—I think—since Freenet traffic is encrypted. But this is not an area I know much about.
This appears to be wrong. I haven’t used Freenet myself (yet), but it doesn’t seem to have servers at all, or admit IP blocking. In this it appears to be analogous to the hidden services (.onion sites) in Tor. And protocol analysis tools (packet sniffers) would appear to be irrelevant—I think—since Freenet traffic is encrypted. But this is not an area I know much about.