Robtex

Up: 31.40.176.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 31.40.184.0/22
Down right: 31.40.188.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.40.184.2	A	ns1.dnsfirefox.com
31.40.184.3	PTR	client-31-40-184-3.m3x.org
31.40.184.3	A	ns2.dnsfnreg.com
31.40.184.3	A	ns2.dnsfirefox.com
31.40.184.4	A	ns1.dnszonehoster.com
31.40.184.125	A	tickeronline.sportworker.com
31.40.184.129	PTR	client-31-40-184-129.m3x.org
31.40.184.129	A	ns1.knetdot.com
31.40.184.129	A	ns1.hugabon.com
31.40.184.174	A	mail.s131-179.news.lemessagedujour.com
31.40.184.224	A	*.sportworker.com
31.40.185.190	A	mail.prom.lg.ua
31.40.188.40	PTR	client-31-40-188-40.m3x.org
31.40.188.127	A	definitewire.com
31.40.188.202	A+PTR	mail.s135-207.ds.femsys.eu
31.40.188.202	A	dns3.bymbombuk.ru
31.40.188.243	A	ns2.gamehorts.at
31.40.189.13	PTR	client-31-40-189-13.m3x.org
31.40.190.23	A	cowardlyindolent.com
31.40.190.213	A	benignstar.com
31.40.191.191	PTR	netline.lg.ua
31.40.191.191	A	*.netline.lg.ua
31.40.191.237	A	distillderivative.com