Robtex

Up: 31.193.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.193.20.0/25
Down right: 31.193.20.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.193.20.49	PTR	49-20-193-31.xdsl.timenet.it
31.193.20.51	PTR	51-20-193-31.xdsl.timenet.it
31.193.20.82	PTR	82-20-193-31.xdsl.timenet.it
31.193.20.86	PTR	86-20-193-31.xdsl.timenet.it
31.193.20.95	PTR	95-20-193-31.xdsl.timenet.it
31.193.20.122	PTR	122-20-193-31.xdsl.timenet.it
31.193.20.166	A	mail.notaiopapi.it
31.193.20.170	PTR	170-20-193-31.xdsl.timenet.it
31.193.20.189	A+PTR	mail.masterelettronica.it
31.193.20.189	A	mail.megruppo.com
31.193.20.202	A	phosis.it
31.193.20.204	PTR	204-20-193-31.xdsl.timenet.it
31.193.20.204	A	mail.zefirosrl.net
31.193.20.204	A	mail.phosis.it
31.193.20.211	A	mail.berni.org