Robtex

Up: 185.51.128.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 185.51.128.0/23
Down right: 185.51.130.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
185.51.128.4	A+PTR	mail.aufwind.co.at
185.51.128.11	PTR	mail.unitedoptics.at
185.51.128.11	A	ns1.unitedoptics.eu
185.51.128.11	A	vista.co.at
185.51.128.12	A	mx1.urlaubswelt.at
185.51.128.14	A	mail.ish.at
185.51.128.123	A+PTR	mail.power-networks.at
185.51.128.123	A	mail.heissl.at
185.51.128.127	A	wirtschaftsexperte.com
185.51.128.239	A	alu-one.net
185.51.128.239	A	konmet.net
185.51.128.239	A	aluone.at
185.51.130.66	PTR	mail.simtronic.at
185.51.130.66	A	simtronic.at
185.51.130.66	A	mx.simtronic.at
185.51.130.71	PTR	mail.simtex.at
185.51.130.71	A	dns2.simtronic.at
185.51.130.71	A	mx.simtex.at
185.51.130.97	A+PTR	mail.muehlbacher-waerme.at