+ http://stopspam.org/rblcheck/index.php
+ aka dul.pacifier.net
+ http://www.stopspam.org/rbl-info/
+ stopped in 2013
+ http://countries.nerd.dk/
+ unable to connect, also for nerd.dk
+ http://dul.ru/dul.en.html
+ DEAD for sale
+ http://dns.measurement-factory.com/surveys/openresolvers.html
+ dead
+ »The following text describes past open DNS resolver surveys and an associated DNS lookup service that has been long shut down«
+ http://www.sectoor.de/tor.php
+ timeouts
+ http://anticaptcha.net/
+ for sale
+ http://blacklist.lashback.com/
+ query zone: ubl.unsubscore.com
+ provider’s website https://lashback.com/ seems alive and active (news entries from 2023) but does not link to the blacklist
+ rsync URLs seem dead, so does the download url
+ http://blacklist.woody.ch/
+ no entries in the displayed "top 100"
+ may have been absorbed into the swinog blacklists, see antispam.imp.ch
+ http://cbl.abuseat.org/
+ https://www.abuseat.org/
+ changes to the CBL that occured in January 2021. In short, the CBL infrastructure was replaced by the Spamhaus XBL structure
+ http://dnsbl.burnt-tech.com/
+ domain is for sale
+ http://rbl.dns-servicios.com/rbl.php
+ website can not be found
+ http://spamcannibal.org/
+ dead, as of at least 2018
+ http://st.technovision.dk/
+ https://docs.hetrixtools.com/st-technovision-dk-inactive-removed/
+ [December 8, 2021] This RBL has stopped responding to DNS queries.
+ http://spamstinks.com/
+ cert is for generic hostname
+ website shows some login form
+ http://virbl.bit.nl/
+ https://www.rollernet.us/2017/01/shutdown-of-virbl-dnsbl-bit-nl/
+ January 23, 2017: »The Virbl-project site has been replaced by this static message to inform those that find their ways here. The Virbl DNSBL-zone was emptied and will be removed all together at a moment further on in the future.«
+ http://www.blocklist.de/en/index.html
+ lots of timeouts as of 2023
+ forum link is dead, among others
+ seems unmaintained but alive
+ latest news is from 2016
+ latest blog entry from 2022
+ Abusix, a network security company for mail security and abuse report handling, takes over blocklist.de to integrate it within its Abusix platform to further improve its data quality.
+ http://www.emailbasura.org/cgi-bin/emailbasura-ini.pl?lang=eng
+ placeholder/parked?
+ http://www.leadmon.net/spamguard/
+ website times out
+ http://www.srntools.com/blacklist/
+ redirects to comodo.com subdomain where I can’t find any information about a DNSBL
+ https://bl.konstant.no/
+ https://docs.hetrixtools.com/bl-konstant-no-unresponsive-removed/
+ [July 29, 2022] This RBL has become unresponsive, and we’ve removed it from our system until it returns to functioning normally again.
+ 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