Robtex

Up: 86.51.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 86.51.148.0/23
Down right: 86.51.150.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
86.51.148.6	PTR	static-86-51-148-6.mobily.com.sa
86.51.148.26	PTR	static-86-51-148-26.mobily.com.sa
86.51.148.29	PTR	static-86-51-148-29.mobily.com.sa
86.51.148.32	PTR	static-86-51-148-32.mobily.com.sa
86.51.148.70	PTR	static-86-51-148-70.mobily.com.sa
86.51.148.85	PTR	static-86-51-148-85.mobily.com.sa
86.51.148.90	PTR	static-86-51-148-90.mobily.com.sa
86.51.148.94	PTR	static-86-51-148-94.mobily.com.sa
86.51.148.134	PTR	static-86-51-148-134.mobily.com.sa
86.51.148.140	PTR	static-86-51-148-140.mobily.com.sa
86.51.148.149	PTR	static-86-51-148-149.mobily.com.sa
86.51.148.162	PTR	static-86-51-148-162.mobily.com.sa
86.51.148.178	PTR	static-86-51-148-178.mobily.com.sa
86.51.148.179	PTR	static-86-51-148-179.mobily.com.sa
86.51.148.202	PTR	static-86-51-148-202.mobily.com.sa
86.51.148.206	PTR	static-86-51-148-206.mobily.com.sa
86.51.148.209	PTR	static-86-51-148-209.mobily.com.sa
86.51.148.210	PTR	static-86-51-148-210.mobily.com.sa
86.51.148.210	A	mail.ewiqatar.com
86.51.148.210	A	webmail.naizak.com
86.51.148.222	PTR	static-86-51-148-222.mobily.com.sa
86.51.148.236	PTR	static-86-51-148-236.mobily.com.sa
86.51.148.249	PTR	static-86-51-148-249.mobily.com.sa
86.51.149.162	PTR	static-86-51-149-162.mobily.com.sa
86.51.149.164	A+PTR	mail.iman-group.com
86.51.149.164	A	smtp.iman-group.com
86.51.149.236	A+PTR	mail.abana.com.sa
86.51.149.236	A	exchcas.abana.com.sa
86.51.149.236	A	abana.com.sa
86.51.150.60	A+PTR	webmail.attejarat.com.sa
86.51.150.60	A+PTR	webmail.mawasims.com.sa
86.51.150.60	A	alnejaidiconsulting.com
86.51.150.123	A+PTR	exchange.fgc.sa
86.51.150.123	A+PTR	exchange.fgcltd.com
86.51.150.178	PTR	static-86-51-150-178.mobily.com.sa
86.51.151.4	PTR	static-86-51-151-4.mobily.com.sa
86.51.151.40	PTR	static-86-51-151-40.mobily.com.sa
86.51.151.61	PTR	static-86-51-151-61.mobily.com.sa
86.51.151.62	PTR	static-86-51-151-62.mobily.com.sa
86.51.151.90	PTR	static-86-51-151-90.mobily.com.sa
86.51.151.96	PTR	static-86-51-151-96.mobily.com.sa
86.51.151.125	PTR	static-86-51-151-125.mobily.com.sa
86.51.151.129	PTR	static-86-51-151-129.mobily.com.sa
86.51.151.144	PTR	static-86-51-151-144.mobily.com.sa
86.51.151.165	PTR	static-86-51-151-165.mobily.com.sa
86.51.151.168	PTR	static-86-51-151-168.mobily.com.sa
86.51.151.178	PTR	static-86-51-151-178.mobily.com.sa
86.51.151.191	PTR	static-86-51-151-191.mobily.com.sa
86.51.151.192	PTR	static-86-51-151-192.mobily.com.sa
86.51.151.223	PTR	static-86-51-151-223.mobily.com.sa
86.51.151.226	PTR	static-86-51-151-226.mobily.com.sa
86.51.151.232	PTR	static-86-51-151-232.mobily.com.sa