Robtex

Up: 216.21.238.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 216.21.238.0/26
Down right: 216.21.238.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.21.238.2	A+PTR	nat.register.com
216.21.238.22	A	csr.register.com
216.21.238.24	A	mailadmin.register.com
216.21.238.25	A	mask01.register.com
216.21.238.29	A	www.hygieneproductshopper.com
216.21.238.29	A	www.register.com
216.21.238.29	A	commercelock.register.com
216.21.238.31	A	vpn.register.com
216.21.238.31	A	download.register.com
216.21.238.34	A	whois.enom373.com
216.21.238.34	A	whois.gatekeeperdomains.net
216.21.238.34	A	whois.interlakenames.com
216.21.238.35	A	whois.names4ever.com