Robtex

Up: 212.30.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.30.21.0/25
Down right: 212.30.21.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.30.21.10	A	post.demogsy.com
212.30.21.34	A	mail3.submarine.gg
212.30.21.34	A	mail.submarine.gg
212.30.21.50	A	mail2.joys.com
212.30.21.66	A+PTR	mail.willowtrust.com
212.30.21.77	A	mail.sphereman.com
212.30.21.100	PTR	mail.smcl.co.gg
212.30.21.117	PTR	mail.smcl.co.gg
212.30.21.123	PTR	mail.asl.gg
212.30.21.123	A+PTR	mail.asl.je
212.30.21.123	A+PTR	mail.altsol.co.uk
212.30.21.124	A	mx1.asl.gg
212.30.21.124	A	mx1.assuredltd.com
212.30.21.125	A	mx2.assuredltd.com
212.30.21.125	A	mx2.asl.gg
212.30.21.162	A+PTR	mail.albanytrustee.com
212.30.21.162	A+PTR	mail.newporthouse.co.gg
212.30.21.162	A	albanytrustee.com
212.30.21.198	A+PTR	mail.blenheimgroup.com
212.30.21.204	A	mail.lince-salisbury.com
212.30.21.204	A	mail.lincesalisbury.com
212.30.21.217	PTR	ay.gg