Robtex

Up: 193.8.230.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 193.8.230.0/25
Down right: 193.8.230.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.8.230.4	PTR	xl4.fourmilab.ch
193.8.230.5	PTR	xl5.fourmilab.ch
193.8.230.6	PTR	xl6.fourmilab.ch
193.8.230.7	PTR	xl7.fourmilab.ch
193.8.230.8	PTR	xl8.fourmilab.ch
193.8.230.11	PTR	clients.fourmilab.ch
193.8.230.17	A+PTR	lj2300.fourmilab.ch
193.8.230.61	PTR	ceres.fourmilab.ch
193.8.230.80	PTR	unimatrix0.fourmilab.ch
193.8.230.81	A+PTR	unimatrix1.fourmilab.ch
193.8.230.90	PTR	hosting0.fourmilab.ch
193.8.230.91	A+PTR	hosting1.fourmilab.ch
193.8.230.92	PTR	hosting2.fourmilab.ch
193.8.230.93	PTR	hosting3.fourmilab.ch
193.8.230.100	A+PTR	server0.fourmilab.ch
193.8.230.101	PTR	server1.fourmilab.ch
193.8.230.102	PTR	server2.fourmilab.ch
193.8.230.103	PTR	server3.fourmilab.ch
193.8.230.109	PTR	server9.fourmilab.ch
193.8.230.131	PTR	chasseral.fourmilab.ch
193.8.230.133	PTR	robinet.fourmilab.ch
193.8.230.134	A+PTR	diesse.fourmilab.ch
193.8.230.136	PTR	bones.fourmilab.ch
193.8.230.138	A+PTR	server.fourmilab.ch
193.8.230.138	A	mail.fourmilab.ch
193.8.230.138	A	www.fourmilab.ch
193.8.230.139	PTR	myrmecophaga.fourmilab.ch
193.8.230.140	PTR	ovni.fourmilab.ch
193.8.230.141	PTR	kropotkin.fourmilab.ch
193.8.230.142	PTR	hosting.fourmilab.ch
193.8.230.142	A	server.fourmilab.to
193.8.230.142	A	hackersdiet.net
193.8.230.145	PTR	moby.fourmilab.ch
193.8.230.146	PTR	lysander.fourmilab.ch
193.8.230.147	PTR	hayek.fourmilab.ch