Robtex

Up: 200.31.28.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 200.31.28.0/25
Down right: 200.31.28.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
200.31.28.37	PTR	mail.phillipsfoodsecuador.com
200.31.28.38	PTR	as-uio-200-31-28-38.impsat.net.ec
200.31.28.90	PTR	maxigraf.com
200.31.28.126	PTR	nirsa.com
200.31.28.130	PTR	futurog.com
200.31.28.142	PTR	napgye.impsat.net.ec
200.31.28.146	PTR	secure.ecuasuiza.com
200.31.28.178	PTR	categ.com.ec
200.31.28.180	PTR	www.categ.com.ec
200.31.28.187	A+PTR	server2.iiasacat.com
200.31.28.187	A	lubrival.com
200.31.28.187	A	iiasacat.com
200.31.28.201	PTR	pop.servientrega.com.ec
200.31.28.202	A+PTR	srv1.servientrega.com.ec
200.31.28.203	A+PTR	www.servientrega.com.ec
200.31.28.203	A	servientrega.com.ec
200.31.28.204	A+PTR	servientrega.com.ec
200.31.28.205	PTR	smtp.servientrega.com.ec
200.31.28.206	PTR	relay.servientrega.com.ec
200.31.28.211	PTR	ucv.edu
200.31.28.212	PTR	www.ucv.edu
200.31.28.221	A+PTR	smtp.veris.com.ec