Robtex

Up: 148.247.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 148.247.21.0/25
Down right: 148.247.21.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
148.247.21.3	A+PTR	mail.cts-design.com
148.247.21.3	A	cts-design.com
148.247.21.3	A	gdl.cinvestav.mx
148.247.21.11	A+PTR	intranet.gdl.cinvestav.mx
148.247.21.12	PTR	video.gdl.cinvestav.mx
148.247.21.17	PTR	mail.gdl.cinvestav.mx
148.247.21.17	A	radiointernational.org
148.247.21.160	PTR	tesla-com.gdl.cinvestav.mx