Robtex

Up: 42.0.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 42.0.4.0/23
Down right: 42.0.6.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
42.0.4.140	PTR	42.0.4-140.robi.com.bd
42.0.4.140	A	r1.sn-5pguxacq-q5je.gvt1.com
42.0.4.140	A	r1.sn-5pguxacq-q5je.a1.googlevideo.com
42.0.4.141	PTR	42.0.4-141.robi.com.bd
42.0.4.238	PTR	42.0.4-238.robi.com.bd
42.0.4.255	PTR	42.0.4-255.robi.com.bd
42.0.5.226	PTR	gprsdk163.robi.com.bd
42.0.5.228	PTR	gprsdk165.robi.com.bd
42.0.5.244	PTR	gprsdk181.robi.com.bd
42.0.5.248	PTR	gprsdk185.robi.com.bd
42.0.5.249	PTR	gprsdk186.robi.com.bd
42.0.5.253	PTR	gprsdk190.robi.com.bd
42.0.5.255	PTR	gprsdk192.robi.com.bd
42.0.6.8	PTR	42.0.6-8.robi.com.bd
42.0.6.12	PTR	42.0.6-12.robi.com.bd
42.0.6.12	A	r1.sn-gvcp5mp5u5-q5jl.googlevideo.com
42.0.6.13	PTR	42.0.6-13.robi.com.bd
42.0.6.13	A	r2.sn-gvcp5mp5u5-q5jl.googlevideo.com
42.0.6.14	PTR	42.0.6-14.robi.com.bd
42.0.6.14	A	r3.sn-gvcp5mp5u5-q5jl.googlevideo.com
42.0.6.15	PTR	42.0.6-15.robi.com.bd
42.0.6.15	A	r4.sn-gvcp5mp5u5-q5jl.googlevideo.com
42.0.6.16	PTR	42.0.6-16.robi.com.bd
42.0.6.16	A	r5.sn-gvcp5mp5u5-q5jl.googlevideo.com
42.0.6.17	PTR	42.0.6-17.robi.com.bd
42.0.6.17	A	r6.sn-gvcp5mp5u5-q5jl.googlevideo.com
42.0.6.36	PTR	42.0.6-36.robi.com.bd
42.0.6.81	PTR	42.0.6-81.robi.com.bd
42.0.6.81	A	scontent.fdac34-1.fna.fbcdn.net
42.0.6.82	PTR	42.0.6-82.robi.com.bd
42.0.6.82	A	video.fdac34-1.fna.fbcdn.net
42.0.6.94	PTR	42.0.6-94.robi.com.bd
42.0.6.94	A	z-m-scontent.fdac34-1.fna.fbcdn.net
42.0.6.97	PTR	42.0.6-97.robi.com.bd
42.0.6.97	A	instagram.fdac34-1.fna.fbcdn.net
42.0.6.131	PTR	42.0.6-131.robi.com.bd
42.0.6.131	A	www.robitvplus.com
42.0.6.131	A	www.airteltvplus.com
42.0.6.235	PTR	gprsdk204.robi.com.bd
42.0.6.239	PTR	gprsdk208.robi.com.bd
42.0.6.243	PTR	gprsdk212.robi.com.bd
42.0.6.255	PTR	gprsdk224.robi.com.bd
42.0.7.24	PTR	42.0.7-24.robi.com.bd
42.0.7.30	PTR	42.0.7-30.robi.com.bd
42.0.7.45	PTR	42.0.7-45.robi.com.bd
42.0.7.66	PTR	42.0.7-66.robi.com.bd
42.0.7.129	PTR	42.0.7-129.robi.com.bd
42.0.7.135	PTR	42.0.7-135.robi.com.bd
42.0.7.145	PTR	42.0.7-145.robi.com.bd
42.0.7.166	PTR	42.0.7-166.robi.com.bd
42.0.7.166	A	dhaka3st.robi.com.bd
42.0.7.184	PTR	42.0.7-184.robi.com.bd
42.0.7.210	PTR	42.0.7-210.robi.com.bd
42.0.7.255	PTR	42.0.7-255.robi.com.bd