Robtex

Up: 81.5.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 81.5.16.0/23
Down right: 81.5.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.5.16.3	PTR	igld-81-5-16-3.inter.net.il
81.5.16.3	A	ns.camtek.co.il
81.5.16.3	A	ns.camtekusa.com
81.5.16.12	PTR	igld-81-5-16-12.inter.net.il
81.5.16.12	A	relay2.camtek.com
81.5.16.13	PTR	igld-81-5-16-13.inter.net.il