+ https://www.megarbl.net/
+ connection times out
+ https://www.blalert.com/dnsbl/rbl.megarbl.net
+ »This blacklist is marked as inactive and is not being checked at the moment. We will be tracking it to see if it goes to normal again.«
+ https://www.kisarbl.or.kr/
+ can’t find information about it
+ website redirects to https://spam.kisa.or.kr/ which gives a 404
+ https://www.abuse.ch/
+ old, defunct link: https://www.abuse.ch/?tag=httpbl
+ does not seem to have a DNSBL (anymore)
+ might be incorporated into spamhaus?
+ does host other databases about threats
+ https://puck.nether.net/or/
+ website is dead