Robtex

Up: 157.100.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 157.100.42.0/25
Down right: 157.100.42.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
157.100.42.8	PTR	host-157-100-42-8.ecua.net.ec
157.100.42.20	PTR	host-157-100-42-20.ecua.net.ec
157.100.42.21	PTR	host-157-100-42-21.ecua.net.ec
157.100.42.146	A+PTR	mail.cip.org.ec
157.100.42.146	A	healthcareadministrationsalaryhq.com
157.100.42.146	A	ns.cip.org.ec
157.100.42.150	PTR	ns.cip.org.ec
157.100.42.151	PTR	ns.cip.org.ec
157.100.42.214	PTR	host-157-100-42-214.ecua.net.ec
157.100.42.243	A+PTR	mail.arbecuador.com