Robtex

Up: 193.17.240.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 193.17.240.0/23
Down right: 193.17.242.0/23

IP	Type	Hostname
193.17.243.1	A+PTR	a1.dbtg.de
193.17.243.1	A	mail1.bundestag.de
193.17.243.2	A+PTR	mail3.dbtg.de
193.17.243.3	A+PTR	a3.dbtg.de
193.17.243.4	A	internet4.dbtg.de
193.17.243.21	A+PTR	internet21.dbtg.de
193.17.243.22	A+PTR	internet22.dbtg.de
193.17.243.22	A	mail3.bundestag.de
193.17.243.23	A	internet23.dbtg.de
193.17.243.101	A+PTR	mail1.dbtg.de
193.17.243.101	A	b1.dbtg.de
193.17.243.102	A+PTR	mail3.dbtg.de
193.17.243.102	A	b2.dbtg.de
193.17.243.103	PTR	mail-a3.dbtg.de