Robtex

Up: 117.6.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 117.6.32.0/23
Down right: 117.6.34.0/23

IP	Type	Hostname
117.6.35.196	PTR	mail.ptc1.com.vn
117.6.35.196	PTR	mail.ptc1.evn.com.vn
117.6.35.197	PTR	mail.ptc1.com.vn
117.6.35.197	A+PTR	mail.ptc1.evn.com.vn
117.6.35.198	PTR	mail.ptc1.com.vn
117.6.35.198	PTR	mail.ptc1.evn.com.vn
117.6.35.199	PTR	mail.ptc1.com.vn
117.6.35.199	PTR	mail.ptc1.evn.com.vn