Robtex

Up: 66.201.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 66.201.160.0/20
Down right: 66.201.176.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.201.160.0	PTR	sv-mobile-apn-4.66.201.160.0.telefonica-ca.net
66.201.160.18	A	scontent.fsal6-1.fna.fbcdn.net
66.201.160.20	A	video.fsal6-1.fna.fbcdn.net
66.201.160.34	A	media.fsal6-1.fna.whatsapp.net
66.201.160.35	A	instagram.fsal6-1.fna.fbcdn.net
66.201.160.242	A	rentacamiones.com.sv
66.201.161.64	PTR	sv-mobile-apn-4.66.201.161.64.telefonica-ca.net
66.201.162.76	PTR	sv-mobile-apn-4.66.201.162.76.telefonica-ca.net
66.201.162.119	PTR	sv-mobile-apn-4.66.201.162.119.telefonica-ca.net
66.201.162.227	PTR	sv-mobile-apn-4.66.201.162.227.telefonica-ca.net
66.201.163.2	PTR	sv-mobile-apn-4.66.201.163.2.telefonica-ca.net
66.201.163.33	PTR	sv-mobile-apn-4.66.201.163.33.telefonica-ca.net
66.201.166.163	PTR	sv-mobile-apn-4.66.201.166.163.telefonica-ca.net
66.201.170.77	A	r2.sn-uxax4vopj5n8-n5al.googlevideo.com
66.201.173.160	PTR	sv-mobile-apn-4.66.201.173.160.telefonica-ca.net
66.201.174.130	PTR	gdpub.info
66.201.178.3	PTR	sv-mobile-apn-4.66.201.178.3.telefonica-ca.net
66.201.183.139	PTR	mail.puerto-quetzal.com
66.201.183.197	PTR	mail.cemaco.com
66.201.184.17	A	external.fmad3-1.fna.fbcdn.net
66.201.184.17	A	scontent.fmad3-1.fna.fbcdn.net
66.201.184.18	A	video.fmad3-1.fna.fbcdn.net
66.201.184.30	A	sonar.fmad3-1.fna.fbcdn.net
66.201.184.32	A	instagram.fmad3-1.fna.fbcdn.net
66.201.184.34	A	z-p3-scontent.fmad3-1.fna.fbcdn.net
66.201.184.40	A	z-1-scontent.fmad3-1.fna.fbcdn.net
66.201.184.40	A	z-1-video.fmad3-1.fna.fbcdn.net
66.201.184.81	A	external.fmad3-2.fna.fbcdn.net
66.201.184.94	A	sonar.fmad3-2.fna.fbcdn.net
66.201.184.96	A	instagram.fmad3-2.fna.fbcdn.net
66.201.184.98	A	z-p3-scontent.fmad3-2.fna.fbcdn.net
66.201.184.104	A	z-1-scontent.fmad3-2.fna.fbcdn.net
66.201.184.104	A	z-1-video.fmad3-2.fna.fbcdn.net
66.201.186.5	A	ns1.2.cdn.telefonica.com
66.201.186.6	A	ns1.2.cdn.telefonica.com
66.201.186.70	A	o21-b38495.2.cdn.telefonica.com
66.201.186.70	A	b38495-p3-hb5-afhpzwog.2.cdn.telefonica.com
66.201.186.70	A	b39832-p7-h1b-afhpzwog.2.cdn.telefonica.com
66.201.186.98	A	o21-b38495.2.cdn.telefonica.com
66.201.186.98	A	b39834-p2-h50.2.cdn.telefonica.com
66.201.186.98	A	b40939.2.cdn.telefonica.com
66.201.186.102	A	o21-b38495.2.cdn.telefonica.com
66.201.186.102	A	b40939.2.cdn.telefonica.com
66.201.186.102	A	b40496.2.cdn.telefonica.com
66.201.186.106	A	o21-b38495.2.cdn.telefonica.com
66.201.186.106	A	b40939.2.cdn.telefonica.com
66.201.186.106	A	b40496.2.cdn.telefonica.com
66.201.187.133	A	h-mercadopago.online-metrix.net
66.201.187.133	A	sb3.h-mercadopago.online-metrix.net
66.201.189.17	A	mail.onesourcesigndesign.com
66.201.190.162	A	radiopanama.com.pa