Robtex

Up: 139.0.20.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 139.0.20.0/24
Down right: 139.0.21.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
139.0.20.27	PTR	ln-static-139-0-20-27.link.net.id
139.0.20.27	A	ns3.xsysnet.com
139.0.20.27	A	ns3.paratekno.com
139.0.20.60	PTR	ln-static-139-0-20-60.link.net.id
139.0.20.74	PTR	ln-static-139-0-20-74.link.net.id
139.0.20.78	PTR	mail.megalife.co.id
139.0.20.80	PTR	ln-static-139-0-20-80.link.net.id
139.0.20.82	A+PTR	mail4.oto.co.id
139.0.20.82	A	mail2.oto.co.id
139.0.20.88	PTR	ln-static-139-0-20-88.link.net.id
139.0.20.88	A	oto.co.id
139.0.20.91	PTR	ln-static-139-0-20-91.link.net.id
139.0.20.91	A	otofinance.co.id
139.0.20.108	PTR	ln-static-139-0-20-108.link.net.id
139.0.20.115	A	mail.allmakes.co.id
139.0.20.115	A	mail.heo-indonesia.com
139.0.20.122	PTR	ln-static-139-0-20-122.link.net.id
139.0.20.122	A	webmail.tabloidbongkar.com
139.0.20.122	A	tabloidbongkar.com
139.0.20.151	PTR	ln-static-139-0-20-151.link.net.id
139.0.20.155	PTR	ln-static-139-0-20-155.link.net.id
139.0.20.155	A	mail.ptnuansa.com
139.0.20.155	A	ptnuansa.com
139.0.20.157	PTR	ln-static-139-0-20-157.link.net.id
139.0.20.164	PTR	ln-static-139-0-20-164.link.net.id
139.0.20.164	A	smtp2.indoturbinept.com
139.0.20.219	PTR	ln-static-139-0-20-219.link.net.id
139.0.21.74	PTR	ln-static-139-0-21-74.link.net.id
139.0.21.74	A	ns1.softnet.co.id
139.0.21.76	PTR	ln-static-139-0-21-76.link.net.id
139.0.21.91	A+PTR	mail.orionnusantara.com
139.0.21.91	A+PTR	mail.transaviaotomasi.com
139.0.21.238	PTR	ln-static-139-0-21-238.link.net.id
139.0.21.240	PTR	ln-static-139-0-21-240.link.net.id