Robtex

Up: 81.201.100.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 81.201.100.0/24
Down right: 81.201.101.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.201.100.47	A	entmail13.mwe.com
81.201.100.120	A	topmanagerteam.eu
81.201.100.124	A	topmanagerteam.net
81.201.100.140	A	router01.de.lifesensor.com
81.201.100.143	PTR	record.us.lifesensor.com
81.201.100.163	A	origin-emea-wildcard.allegiancetech.com
81.201.100.163	A	inquisiteasp.dk
81.201.100.163	A	e-server.dk
81.201.100.177	A	pwebapi2.at.lifesensor.com
81.201.100.230	A	europe.forticloud.com
81.201.101.3	PTR	www.pentahotels.com
81.201.101.5	PTR	www.pentahotels.com
81.201.101.34	A	gerwanserver.de
81.201.101.34	A	mail.buschtiger.de
81.201.101.34	A	buschtiger.de
81.201.101.37	A	*.webprovider.net
81.201.101.37	A	dehost2.webprovider.net
81.201.101.37	A	smapartner.webprovider.net
81.201.101.45	A	vhost-101-45.gerwan.de
81.201.101.48	A	mail.lps-group.de
81.201.101.164	PTR	sat1dating.de
81.201.101.164	PTR	tnx1.de
81.201.101.193	A	redbus-ffm-gw.dis-ag.de
81.201.101.194	A	frankfurt2-rt-dis.dis-ag.de
81.201.101.196	PTR	gw101196-eu.fortimail.com
81.201.101.196	A	f01diagffm.dis-ag.de
81.201.101.197	A	f02diagffm.dis-ag.de
81.201.101.198	A+PTR	fdiagffm.dis-ag.de
81.201.101.200	A+PTR	gw101200-eu.fortimail.com
81.201.101.201	A	gw101201-eu.fortimail.com
81.201.101.201	A	f01enxffm.dis-ag.de
81.201.101.202	A	f02enxffm.dis-ag.de
81.201.101.202	A	gw101202-eu.fortimail.com
81.201.101.203	A	fenxffm.dis-ag.de
81.201.101.205	A+PTR	gw101205-eu.fortimail.com
81.201.101.205	A	mailgw4.dis-ag.de
81.201.101.207	A	office-award.info
81.201.101.207	A	www.timeandmore.de
81.201.101.207	A	officeaward.net
81.201.101.209	A+PTR	mailgw5.dis-ag.com
81.201.101.212	A+PTR	gw101212-eu.fortimail.com
81.201.101.213	PTR	gw101213-eu.fortimail.com
81.201.101.214	PTR	gw101214-eu.fortimail.com
81.201.101.214	A	portal.dis.ag
81.201.101.215	PTR	gw101215-eu.fortimail.com
81.201.101.215	A	freemail.dis.ag
81.201.101.216	A+PTR	freemail.euro-engineering.com
81.201.101.216	A	mail.euro-engineering.com
81.201.101.217	A	wi03.dis.ag
81.201.101.218	A+PTR	webmail.euro-engineering.de
81.201.101.219	A+PTR	webmail.euro-engineering.com
81.201.101.220	A+PTR	sync.euro-engineering.com
81.201.101.221	A	euro-engineering-aerospace.com
81.201.101.221	A	euro-engineering-aerospace.de
81.201.101.221	A	dis-ag.net
81.201.101.222	A	wi04.dis.ag
81.201.101.224	A	jobs.euro-engineering.de
81.201.101.228	A+PTR	webmail.dis-ag.com
81.201.101.228	A	webmail.dis-ag.de
81.201.101.229	A	sync.dis-ag.com
81.201.101.233	PTR	g1adc-frnk-de.fw.telefonica.de
81.201.101.237	PTR	gw101237-eu.fortimail.com
81.201.101.240	A+PTR	mailgw3.dis-ag.de
81.201.101.241	A	whatsup.dis-ag.com