Robtex

Up: 168.243.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 168.243.48.0/23
Down right: 168.243.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
168.243.48.33	PTR	distributions.telecam.net
168.243.48.33	PTR	ns.telecam.net
168.243.48.33	PTR	ns.symtek.com.sv
168.243.48.34	PTR	mail.telecam.net
168.243.48.34	A	mail.imagenfilm.com
168.243.48.61	A	elcolegioenlinea.com
168.243.48.179	PTR	mail.primerbanco.com.sv.48.243.168.in-addr.arpa
168.243.48.230	A	cendimor.com
168.243.48.230	A	hostmaster.cendimor.com
168.243.49.33	PTR	distributions.telecam.net
168.243.49.33	PTR	ns.telecam.net
168.243.49.33	PTR	ns.telecam.com.sv
168.243.49.34	PTR	mail.telecam.net