Robtex

Up: 203.120.160.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 203.120.160.0/22
Down right: 203.120.164.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.120.160.5	PTR	sgnet-203-120-160-5.pacificinternet.com
203.120.160.93	PTR	gi0-0-3.948.scipk022.sin7.pacific.net.sg
203.120.160.133	PTR	gi0-0-2.620.scipk022.sin7.pacific.net.sg
203.120.160.163	PTR	sgnet-203-120-160-163.pacificinternet.com
203.120.160.171	PTR	sgnet-203-120-160-171.pacificinternet.com
203.120.160.247	PTR	sgnet-203-120-160-247.pacificinternet.com
203.120.161.19	PTR	sgnet-203-120-161-19.pacificinternet.com
203.120.161.38	PTR	server.pcsos.com.sg
203.120.161.196	PTR	sgnet-203-120-161-196.pacificinternet.com
203.120.162.6	A	mail.contactable.com
203.120.162.20	PTR	connorms.com.sg
203.120.162.40	PTR	smtp3.achieva.com.sg
203.120.162.51	PTR	mail-gw2.x-media.com.sg
203.120.162.51	A	maya.com.sg
203.120.162.171	PTR	mail1.ntegrator.com
203.120.162.202	A	po.sysquest.sg
203.120.164.189	A	smtpsg03.cimb.com
203.120.164.194	PTR	mail1.teraoka.com.sg
203.120.164.199	PTR	mail.teraoka.com.sg
203.120.164.210	PTR	mail8.teraoka.com.sg
203.120.164.220	PTR	mail9.teraoka.com.sg
203.120.165.44	A	secmail.ktp.com.sg
203.120.165.46	A+PTR	webmail.ktp.com.sg
203.120.165.243	PTR	mail.tripower.com.sg
203.120.166.10	PTR	neptune.eportofsingapore.com
203.120.166.10	PTR	neptune.esingaporeport.com
203.120.166.10	PTR	neptune.portofsingaporemag.com
203.120.166.11	PTR	mpa.gov.sg
203.120.166.11	PTR	mpacom.mpa.gov.sg
203.120.166.15	PTR	hermes.mpa.gov.sg
203.120.166.20	PTR	mpa-opal1.mpa.gov.sg
203.120.166.22	A	mpaln5.mpa.gov.sg
203.120.166.40	PTR	eportofsingapore.com
203.120.166.40	PTR	esingaporeport.com
203.120.166.40	PTR	portofsingaporemag.com