Robtex

Up: 121.55.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.55.192.0/22
Down right: 121.55.196.0/22

IP	Type	Hostname
121.55.192.0	A+PTR	0.121.55.192.guam.net
121.55.192.35	A+PTR	35.121.55.192.guam.net
121.55.192.36	A	36.121.55.192.guam.net
121.55.192.40	A+PTR	40.121.55.192.guam.net
121.55.192.42	PTR	mail.akguam.com
121.55.192.50	A+PTR	50.121.55.192.guam.net
121.55.192.50	A	textpinashk.com
121.55.192.73	A	*.medpharmusa.com
121.55.192.73	A	mail.medpharmusa.com
121.55.192.82	PTR	82.121.55.192.guam.net
121.55.193.68	A+PTR	121-55-193-68.d.c200.guam.net