Robtex

Up: 192.109.80.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.109.81.0/25
Down right: 192.109.81.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.109.81.1	A+PTR	ns.mainz.ibm.com
192.109.81.1	A	aixserv.de.ibm.com
192.109.81.1	A	dns.de.ibm.com
192.109.81.6	A+PTR	ftp.de.ibm.com
192.109.81.6	A	ftp.mainz.ibm.com
192.109.81.7	A+PTR	ftp.ecurep.ibm.com
192.109.81.10	A	ftps.ecurep.ibm.com
192.109.81.14	A+PTR	secure.ecurep.ibm.com
192.109.81.15	A+PTR	mail.mainz.ibm.com
192.109.81.15	A	mainz.ibm.com
192.109.81.20	A+PTR	www.ecurep.ibm.com
192.109.81.21	A+PTR	www.secure.ecurep.ibm.com
192.109.81.25	A+PTR	sftp.ecurep.ibm.com
192.109.81.40	A+PTR	www.itc.de.ibm.com
192.109.81.51	A+PTR	itcwsoko.de.ibm.com
192.109.81.56	A+PTR	itcae51.de.ibm.com
192.109.81.151	A	snape.de.ibm.com
192.109.81.213	A+PTR	esccvc.de.ibm.com