Robtex

Up: 216.52.204.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 216.52.204.0/24
Down right: 216.52.205.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.52.204.16	A+PTR	ns18.mayeseducation.com
216.52.204.17	A+PTR	mx18.mayeseducation.com
216.52.204.21	A	mail.waldorf.edu
216.52.204.27	PTR	27.18.mayeseducation.com
216.52.204.27	A	mycsu.columbiasouthern.edu
216.52.204.29	PTR	29.18.mayeseducation.com
216.52.204.29	A	authc.columbiasouthern.edu
216.52.204.29	A	auth.columbiasouthern.edu
216.52.204.31	PTR	31.18.mayeseducation.com
216.52.204.31	A	spamgate2.mayeseducation.com
216.52.204.31	A	61.18.mayeseducation.com
216.52.204.51	PTR	51.18.mayeseducation.com
216.52.204.51	A	online.columbiasouthern.edu
216.52.204.51	A	onlinec.columbiasouthern.edu