Robtex

Up: 213.167.74.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 213.167.75.0/25
Down right: 213.167.75.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.167.75.11	PTR	service1.mimecast-offshore.com
213.167.75.15	A+PTR	res1.mimecast-offshore.com
213.167.75.16	A	jer1-scan1.mimecast-offshore.com
213.167.75.17	PTR	service3.mimecast-offshore.com
213.167.75.18	A+PTR	service.mimecast-offshore.com
213.167.75.19	A+PTR	service5.mimecast-offshore.com
213.167.75.19	A	mail.wq.bm
213.167.75.20	PTR	login.mimecast-offshore.com
213.167.75.20	A+PTR	webmail.mimecast-offshore.com
213.167.75.21	A+PTR	jer-api.mimecast.com
213.167.75.22	A+PTR	jer-api-2.mimecast-offshore.com
213.167.75.22	PTR	jer-api.mimecast-offshore.com
213.167.75.22	A+PTR	xdk.mimecast-offshore.com
213.167.75.23	A	mso4.mimecast-offshore.com
213.167.75.24	PTR	off-smtp-1.mimecast-offshore.com
213.167.75.24	A+PTR	off-smtp-2.mimecast-offshore.com
213.167.75.25	A+PTR	je-smtp-delivery-1.mimecast-offshore.com
213.167.75.26	A+PTR	je-pop.mimecast-offshore.com
213.167.75.26	A+PTR	je-smtp-1.mimecast-offshore.com
213.167.75.26	A+PTR	je-smtp-2.mimecast-offshore.com
213.167.75.27	A+PTR	je-smtp-delivery-1.mimecast-offshore.com
213.167.75.28	A	je-smtp-delivery-2.mimecast-offshore.com
213.167.75.29	A+PTR	je-smtp-delivery-3.mimecast-offshore.com
213.167.75.30	A	je-smtp-delivery-4.mimecast-offshore.com
213.167.75.31	A	je-smtp-delivery-5.mimecast-offshore.com
213.167.75.32	A+PTR	je-smtp-delivery-6.mimecast-offshore.com
213.167.75.36	A+PTR	je-smtp-inbound-1.mimecast-offshore.com
213.167.75.36	A+PTR	je-smtp-inbound-2.mimecast-offshore.com
213.167.75.36	A	stawson.com
213.167.75.37	A+PTR	je-smtp-outbound-2.mimecast-offshore.com
213.167.75.37	A+PTR	je-smtp-outbound-1.mimecast-offshore.com
213.167.75.38	A+PTR	je-smtp-journal-1.mimecast-offshore.com
213.167.75.38	A+PTR	je-smtp-journal-2.mimecast-offshore.com
213.167.75.40	A	console-je-1.mimecast-offshore.com
213.167.75.40	A	console-je.mimecast-offshore.com
213.167.75.41	A+PTR	je-smtp-o365-outbound-2.mimecast-offshore.com
213.167.75.41	A+PTR	je-smtp-o365-outbound-1.mimecast-offshore.com
213.167.75.57	A+PTR	je-smtp-delivery-17.mimecast-offshore.com
213.167.75.58	A+PTR	je-smtp-delivery-18.mimecast-offshore.com
213.167.75.248	A	je-smtp-delivery-18.mimecast-offshore.com