Robtex

Up: 31.131.254.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.131.255.0/25
Down right: 31.131.255.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.131.255.5	PTR	ns3.selectel.org
31.131.255.5	A	ns1.mediaweb.ru
31.131.255.5	A	ns2.pisi.tandemwise.net
31.131.255.10	PTR	ns1.selectel.org
31.131.255.10	A	ns1.mediaweb.ru
31.131.255.10	A	ns1.academcloud.ru
31.131.255.15	A+PTR	rs1.selectel.org
31.131.255.20	A+PTR	ns1.vscale.io
31.131.255.25	A	rs1.vscale.io