Reenable Metacentrum network list update
Once upon a time there was an automatic update of the list of Meta networks into the __GRID__ abuse group. It's gotten lost in the chasms of ages, however we might boldly draw it back to light.
List is accessible at https://mailman.metacentrum.cz/share/certs/hosts_list (use wget or curl, not browser, as it is too clever in SSL renegotiation).
In the history, the list was downloaded at ir.cesnet.cz and uploaded to email@example.com:iplist-grid. Mek, there must have been some script somewhere, which took this data and updated the group - so for start, please, try to search for this code, update then should be straightforward.