220.131.in-addr.arpa.DNS2.UNI-BONN.DEUNIBN-DNS.UNI-KOELN.DEDNS3.UNI-BONN.DEDNS1.UNI-BONN.DEhttps://rdap.arin.net/registry/domain/220.131.in-addr.arpa.https://whois.arin.net/rest/rdns/220.131.in-addr.arpa.2025-05-14T12:03:03-04:00