+ http://dnsbl.iip.lu/
+ https://docs.hetrixtools.com/lookup-dnsbl-iip-lu-false-positive-removed/
+ in 2016: lookup.dnsbl.iip.lu blacklist started issuing false positive responses and upon further investigation looks to be abandoned/dead.
+ https://www.blalert.com/dnsbl/lookup.dnsbl.iip.lu
+ This blacklist is marked as "shut down" and non-operational as of 2017-12-31.
+ http://dnsbl.inps.de/
+ timeout
+ https://www.dnsbl.com/search/label/dnsbl.inps.de
+ Today, May 25, 2020, he has announced that it is shutting down, due to concerns around GDPR and personal challenges brought on by the coronavirus pandemic.
+ https://docs.hetrixtools.com/dnsbl-inps-de-removed-from-our-system/
+ [May 29,2018] IPv4 RBL dnsbl.inps.de has been removed from our system, as they have decided to discontinue the RBL project for the time being.
+ https://glockapps.com/blacklist/dnsbl-inps-de/
+ Today, May 25, 2020, he has announced that it is shutting down, due to concerns around GDPR and personal challenges brought on by the coronavirus pandemic.
+ https://www.dnsbl.info/dnsbl-details.php?dnsbl=dnsbl.inps.de
+ This blacklist is offline as of May 1, 2020.
+ https://web.archive.org/web/20220428013500/http://www.inps.de/