Robtex

Up: 161.30.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 161.30.0.0/18
Down right: 161.30.64.0/18

IP	Type	Hostname
161.30.5.60	PTR	mail.abu.inmarsat.com
161.30.46.51	A+PTR	lonisathub01.inmarsat.com
161.30.89.129	A+PTR	ext-cisco-gw-inm.dev.inmarsat.com
161.30.89.176	A	xr-ast-1.dev.inmarsat.com
161.30.89.177	A	xr-cert-1.dev.inmarsat.com
161.30.96.141	A	michaelsoft.co.uk
161.30.105.102	A+PTR	launchpad-upgradeserver.inmarsat.com
161.30.118.1	A	ns1.sep.inmarsat.com