For the last 18 months or so there has been a list of individual RIBnet members' MMSI numbers available to download. As it was manually updated, it was generally out of date - partly because I didn't update it very often, and partly because lots of people didn't send me their details!
Thanks to BenC's efforts we now have a new improved system. MMSI numbers are taken directly from the MMSI field in your user profile, so the list is automatically updated when anyone changes their details. All credit for BenC for making this possible!
RIBnet MMSI list
You can check and update your information here http://www.rib.net/forum/profile.php?do=editprofile
We may make a few tweaks for the sake of better presentation, but as of today, it's there and working.