Robtex

Up: 81.21.40.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.21.40.0/25
Down right: 81.21.40.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.21.40.2	A	static-40-2.callsat-telecom.com
81.21.40.10	A+PTR	static-40-10.callsat-telecom.com
81.21.40.18	PTR	mail.fic.com.cy
81.21.40.18	A	f2crane.com
81.21.40.18	A	mail.stss.eu
81.21.40.19	PTR	static-40-19.callsat-telecom.com
81.21.40.19	A	marineinvestments.eu
81.21.40.19	A	mail.marineinvestments.eu
81.21.40.24	PTR	mail.enginepartners.cy.net
81.21.40.24	A	mail.bluereact.eu
81.21.40.25	PTR	static-40-25.callsat-telecom.com
81.21.40.25	A	mail.sat-net.net
81.21.40.25	A	onenetgroup.net
81.21.40.26	PTR	static-40-26.callsat-telecom.com
81.21.40.29	PTR	static-40-29.callsat-telecom.com
81.21.40.33	A+PTR	static-40-33.callsat-telecom.com
81.21.40.35	A	static-40-35.callsat-telecom.com
81.21.40.36	A+PTR	static-40-36.callsat-telecom.com
81.21.40.50	A+PTR	static-40-50.callsat-telecom.com
81.21.40.56	A+PTR	static-40-56.callsat-telecom.com
81.21.40.77	A+PTR	static-40-77.callsat-telecom.com
81.21.40.78	A+PTR	static-40-78.callsat-telecom.com
81.21.40.86	A+PTR	static-40-86.callsat-telecom.com
81.21.40.88	A+PTR	static-40-88.callsat-telecom.com
81.21.40.92	A+PTR	static-40-92.callsat-telecom.com
81.21.40.94	A+PTR	static-40-94.callsat-telecom.com
81.21.40.99	PTR	static-40-99.callsat-telecom.com
81.21.40.101	PTR	static-40-101.callsat-telecom.com
81.21.40.104	PTR	static-40-104.callsat-telecom.com
81.21.40.106	PTR	static-40-106.callsat-telecom.com
81.21.40.110	PTR	static-40-110.callsat-telecom.com
81.21.40.115	PTR	static-40-115.callsat-telecom.com
81.21.40.116	PTR	static-40-116.callsat-telecom.com
81.21.40.121	PTR	static-40-121.callsat-telecom.com
81.21.40.126	PTR	static-40-126.callsat-telecom.com
81.21.40.130	PTR	static-40-130.callsat-telecom.com
81.21.40.141	PTR	static-40-141.callsat-telecom.com
81.21.40.142	PTR	static-40-142.callsat-telecom.com
81.21.40.143	PTR	static-40-143.callsat-telecom.com
81.21.40.149	PTR	static-40-149.callsat-telecom.com
81.21.40.150	PTR	static-40-150.callsat-telecom.com
81.21.40.156	PTR	static-40-156.callsat-telecom.com
81.21.40.158	PTR	static-40-158.callsat-telecom.com
81.21.40.159	PTR	static-40-159.callsat-telecom.com
81.21.40.167	PTR	static-40-167.callsat-telecom.com
81.21.40.175	PTR	static-40-175.callsat-telecom.com
81.21.40.185	PTR	static-40-185.callsat-telecom.com
81.21.40.190	PTR	static-40-190.callsat-telecom.com
81.21.40.196	PTR	static-40-196.callsat-telecom.com
81.21.40.201	PTR	static-40-201.callsat-telecom.com
81.21.40.202	PTR	static-40-202.callsat-telecom.com
81.21.40.203	PTR	static-40-203.callsat-telecom.com
81.21.40.206	PTR	static-40-206.callsat-telecom.com
81.21.40.213	PTR	static-40-213.callsat-telecom.com
81.21.40.223	PTR	static-40-223.callsat-telecom.com
81.21.40.226	PTR	static-40-226.callsat-telecom.com
81.21.40.228	PTR	static-40-228.callsat-telecom.com
81.21.40.231	PTR	static-40-231.callsat-telecom.com
81.21.40.232	PTR	static-40-232.callsat-telecom.com
81.21.40.246	PTR	static-40-246.callsat-telecom.com
81.21.40.249	PTR	static-40-249.callsat-telecom.com
81.21.40.252	PTR	static-40-252.callsat-telecom.com