Robtex

Up: 206.195.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 206.195.192.0/20
Down right: 206.195.208.0/20

IP	Type	Hostname
206.195.193.254	A+PTR	users100.principal.com
206.195.193.254	A	users2.principal.com
206.195.196.18	A+PTR	mx4.principal.com
206.195.196.19	A+PTR	mx5.principal.com
206.195.196.20	A+PTR	mx1.principal.com
206.195.196.21	A+PTR	mx2.principal.com
206.195.196.32	A+PTR	ns1.principal.com
206.195.196.46	A+PTR	secureftp.principal.com
206.195.196.48	A+PTR	pseamx1.principal.com
206.195.196.49	A	pseamx2.principal.com
206.195.196.143	A	firstdentalhealth.com
206.195.196.143	A	www.firstdentalhealth.com
206.195.196.144	A+PTR	secure02.principalfunds.com
206.195.196.145	A	pringlobal.com
206.195.196.160	A	sp.principal.com
206.195.196.165	A+PTR	principalglobalnet.com
206.195.196.167	PTR	iishh.principal.com
206.195.196.167	A	principlerealestateinvestors.com
206.195.196.167	A	principalbank.net
206.195.196.194	A	wa.principal.com
206.195.196.198	A	myeasyenrollment.com
206.195.196.201	A+PTR	principaltrust.com
206.195.196.204	A+PTR	principalfunds.com
206.195.196.226	A+PTR	employers-groupbenefits.principal.com
206.195.196.236	A	mydentalplan.net
206.195.196.244	A+PTR	api.principal.com
206.195.196.248	A	newdentalchoice.com
206.195.200.20	A+PTR	tmx1.principal.com
206.195.200.21	A+PTR	tmx2.principal.com
206.195.200.32	A	pilot.principal.com
206.195.200.36	A+PTR	secure05.pilot.principal.com
206.195.200.111	A+PTR	api.pilot.principal.com
206.195.200.175	PTR	www.pilot.principalcdn.com
206.195.204.160	A	www.principal.com
206.195.204.160	A	principal.com
206.195.204.185	A+PTR	passport.principal.com
206.195.204.185	A	principalpassport.com
206.195.204.192	A	login.principal.com
206.195.208.253	A+PTR	users.principal.com
206.195.209.10	A+PTR	accessedge.principal.com
206.195.209.12	A+PTR	av.principal.com
206.195.209.14	A+PTR	accessedge.principal.com
206.195.209.16	A	av.principal.com
206.195.210.150	A	citygrouptoto.org