I originally wasn't going to make the whole thing avaiable, but there was a posting a few ago on nanog listing a number of blocks, so I feel obliged to post a link to my results. I plan on putting a nice backend behind this and making it a queryable database that checks itself frequently, but I've not had the time. This list is the result of about a weeks worth of work probing a total of 48394 netblocks. Of those netblocks, 6425 were found to respond with more than one packet sent to the network address. broadcast address of 255 was not checked, nor anything else than the list here. This means 13.28% of netblocks out there are "broken". The page can be found at http://puck.nether.net/~jared/smurfblocks.html If you own any of these networks, please fix them. I'll be doing some work to get HOME-AS for these blocks into some format such that you all can do fancy web-based queries or somesuch with them. That stuff will show up at http://puck.nether.net/smurf-check/ once I get some more time. Please also visit the following pages: http://www.powertech.no/smurf/ - SAR http://www.quadrunner.com/~chuegen/smurf.txt http://www.mcs.net/smurf/ -- if you can't see this page, you're on their blacklist. a mirrored page is http://puck.nether.net/smurf/ <- here for your use. I'm not blackholing anything myself. Questions? Please direct them to me. Flames can direct your responses to nobody@nether.net Thanks. - jared