Robtex

Up: 221.128.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 221.128.0.0/18
Down right: 221.128.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.128.4.63	A	cable63.dyn4.pacific.net.sg
221.128.4.66	A	cable66.dyn4.pacific.net.sg
221.128.4.95	A	cable95.dyn4.pacific.net.sg
221.128.4.104	A	cable104.dyn4.pacific.net.sg
221.128.4.140	A	cable140.dyn4.pacific.net.sg
221.128.4.152	A	cable152.dyn4.pacific.net.sg
221.128.4.158	A	cable158.dyn4.pacific.net.sg
221.128.4.182	A	cable182.dyn4.pacific.net.sg
221.128.12.52	A	cable52.dyn12.pacific.net.sg
221.128.12.141	A	cable141.dyn12.pacific.net.sg
221.128.12.147	A	cable147.dyn12.pacific.net.sg
221.128.13.3	A+PTR	cable3.dyn13.pacific.net.sg
221.128.13.6	A	cable6.dyn13.pacific.net.sg
221.128.13.9	A	cable9.dyn13.pacific.net.sg
221.128.13.10	A	cable10.dyn13.pacific.net.sg
221.128.13.136	A	cable136.dyn13.pacific.net.sg
221.128.13.144	A	cable144.dyn13.pacific.net.sg
221.128.13.149	A	cable149.dyn13.pacific.net.sg
221.128.13.151	A	cable151.dyn13.pacific.net.sg
221.128.15.2	A	cable2.dyn15.pacific.net.sg
221.128.15.4	A+PTR	cable4.dyn15.pacific.net.sg
221.128.15.14	A	cable14.dyn15.pacific.net.sg
221.128.15.23	A	cable23.dyn15.pacific.net.sg
221.128.15.132	A	cable132.dyn15.pacific.net.sg
221.128.15.169	A	cable169.dyn15.pacific.net.sg
221.128.15.175	A	cable175.dyn15.pacific.net.sg
221.128.15.179	A	cable179.dyn15.pacific.net.sg
221.128.17.15	A	cable15.dyn17.pacific.net.sg
221.128.35.2	A+PTR	cable2.dyn35.pacific.net.sg
221.128.35.15	A	cable15.dyn35.pacific.net.sg
221.128.35.20	A	cable20.dyn35.pacific.net.sg
221.128.35.26	A	cable26.dyn35.pacific.net.sg
221.128.35.129	A+PTR	cable129.dyn35.pacific.net.sg
221.128.35.133	A	cable133.dyn35.pacific.net.sg
221.128.35.151	A	cable151.dyn35.pacific.net.sg
221.128.35.156	A	cable156.dyn35.pacific.net.sg
221.128.36.8	A	cable8.dyn36.pacific.net.sg
221.128.36.11	A	cable11.dyn36.pacific.net.sg
221.128.36.13	A	cable13.dyn36.pacific.net.sg
221.128.36.14	A	cable14.dyn36.pacific.net.sg
221.128.36.138	A	cable138.dyn36.pacific.net.sg
221.128.36.140	A	cable140.dyn36.pacific.net.sg
221.128.36.141	A	cable141.dyn36.pacific.net.sg
221.128.36.142	A	cable142.dyn36.pacific.net.sg
221.128.37.3	A+PTR	cable3.dyn37.pacific.net.sg
221.128.37.4	A+PTR	cable4.dyn37.pacific.net.sg
221.128.37.6	A	cable6.dyn37.pacific.net.sg
221.128.37.10	A	cable10.dyn37.pacific.net.sg
221.128.37.142	A	cable142.dyn37.pacific.net.sg
221.128.37.147	A	cable147.dyn37.pacific.net.sg
221.128.37.148	A	cable148.dyn37.pacific.net.sg
221.128.37.151	A	cable151.dyn37.pacific.net.sg
221.128.38.2	A+PTR	cable2.dyn38.pacific.net.sg
221.128.39.1	A+PTR	cable1.dyn39.pacific.net.sg
221.128.39.3	A+PTR	cable3.dyn39.pacific.net.sg
221.128.39.11	A	cable11.dyn39.pacific.net.sg
221.128.39.22	A	cable22.dyn39.pacific.net.sg
221.128.39.137	A	cable137.dyn39.pacific.net.sg
221.128.39.145	A	cable145.dyn39.pacific.net.sg
221.128.39.150	A	cable150.dyn39.pacific.net.sg
221.128.39.151	A	cable151.dyn39.pacific.net.sg
221.128.40.1	A+PTR	cable1.dyn40.pacific.net.sg
221.128.40.2	A+PTR	cable2.dyn40.pacific.net.sg
221.128.40.4	A+PTR	cable4.dyn40.pacific.net.sg
221.128.40.12	A	cable12.dyn40.pacific.net.sg
221.128.40.136	A	cable136.dyn40.pacific.net.sg
221.128.40.141	A	cable141.dyn40.pacific.net.sg
221.128.40.147	A	cable147.dyn40.pacific.net.sg
221.128.40.148	A	cable148.dyn40.pacific.net.sg
221.128.42.41	A	cable41.dyn42.pacific.net.sg
221.128.42.50	A	cable50.dyn42.pacific.net.sg
221.128.42.54	A	cable54.dyn42.pacific.net.sg
221.128.42.56	A	cable56.dyn42.pacific.net.sg
221.128.42.156	A	cable156.dyn42.pacific.net.sg
221.128.42.177	A	cable177.dyn42.pacific.net.sg
221.128.42.185	A	cable185.dyn42.pacific.net.sg
221.128.42.220	A	cable220.dyn42.pacific.net.sg
221.128.44.3	PTR	cable3.dyn44.pacific.net.sg
221.128.44.131	PTR	cable131.dyn44.pacific.net.sg
221.128.53.35	A	cable35.dyn53.pacific.net.sg
221.128.53.51	A	cable51.dyn53.pacific.net.sg
221.128.53.57	A	cable57.dyn53.pacific.net.sg
221.128.53.59	A	cable59.dyn53.pacific.net.sg
221.128.53.134	A	cable134.dyn53.pacific.net.sg
221.128.53.141	A	cable141.dyn53.pacific.net.sg
221.128.53.142	A	cable142.dyn53.pacific.net.sg
221.128.53.150	A	cable150.dyn53.pacific.net.sg
221.128.65.36	A	ieip.in.th
221.128.65.98	PTR	mailserver.imcopack.com
221.128.65.100	PTR	mailserver.imcopack.com
221.128.66.11	PTR	mail.dol.go.th
221.128.72.201	A	mail2.thaitv3.com
221.128.72.215	A	vpn.ophir-energy.com
221.128.73.70	A	relax.ine.co.th
221.128.73.101	A	sony-srirachanakorn.ine.co.th
221.128.74.50	PTR	mail.virginradiothailand.com
221.128.74.51	PTR	mail.eazyfm.com
221.128.74.51	PTR	mail.virginhitz.com
221.128.74.52	A	mail10.virginradiothailand.com
221.128.74.76	PTR	rznet.com
221.128.74.131	PTR	mail.diethelmevents.com
221.128.74.131	PTR	mail.dt-asia.com
221.128.74.186	PTR	mail.spsthai.com
221.128.78.114	PTR	mailserver.sct.co.th
221.128.78.117	A	mailbackup.sct.co.th
221.128.79.66	A	mail.bangkokweb.com
221.128.79.71	A	newbangpoo.com
221.128.79.74	A	www.timedecocorp.com
221.128.79.74	A	timedecocorp.com
221.128.79.225	A	mail.thcity.com
221.128.80.16	PTR	16.80.128.221.in-addr.arpa
221.128.86.140	PTR	smtp.seavaluegroup.com
221.128.86.140	PTR	mail2.seavaluemarketing.com
221.128.86.142	PTR	mail2.seavaluegroup.com
221.128.86.142	PTR	pop.seavaluegroup.com
221.128.88.3	PTR	tot-88-3.pacific.net.th
221.128.89.128	PTR	tot-89-128.pacific.net.th
221.128.91.4	PTR	tot-91-4.pacific.net.th
221.128.91.128	PTR	tot-91-128.pacific.net.th
221.128.92.128	PTR	tot-92-128.pacific.net.th
221.128.92.130	PTR	tot-92-130.pacific.net.th
221.128.92.131	PTR	tot-92-131.pacific.net.th
221.128.94.131	A	mail.fullk-empty-scissors.xyz
221.128.95.2	PTR	tot-95-2.pacific.net.th
221.128.95.3	PTR	tot-95-3.pacific.net.th
221.128.96.4	PTR	tot-96-4.pacific.net.th
221.128.96.129	PTR	tot-96-129.pacific.net.th
221.128.96.131	PTR	tot-96-131.pacific.net.th
221.128.97.3	PTR	tot-97-3.pacific.net.th
221.128.97.4	PTR	tot-97-4.pacific.net.th
221.128.101.1	PTR	tot-101-1.pacific.net.th
221.128.101.2	PTR	tot-101-2.pacific.net.th
221.128.101.162	A	cubike-chula.com
221.128.102.1	PTR	tot-102-1.pacific.net.th
221.128.102.2	PTR	tot-102-2.pacific.net.th
221.128.102.4	PTR	tot-102-4.pacific.net.th
221.128.102.129	PTR	tot-102-129.pacific.net.th
221.128.102.131	PTR	tot-102-131.pacific.net.th
221.128.103.98	A	pclbgd.net
221.128.103.131	PTR	tot-103-131.pacific.net.th
221.128.105.77	PTR	ns13.4gbhost.com
221.128.105.77	A	www.rth2.ac.th
221.128.105.77	A	mail.acme.in.th
221.128.105.109	A	quarella-thai.com
221.128.108.131	PTR	tot-108-131.pacific.net.th
221.128.109.1	PTR	tot-109-1.pacific.net.th
221.128.109.129	PTR	tot-109-129.pacific.net.th
221.128.111.2	PTR	tot-111-2.pacific.net.th
221.128.111.128	PTR	tot-111-128.pacific.net.th
221.128.111.130	PTR	tot-111-130.pacific.net.th
221.128.112.2	PTR	2.112.128.221.static.pacific.net.th
221.128.112.129	PTR	129.112.128.221.static.pacific.net.th
221.128.113.2	PTR	2.113.128.221.static.pacific.net.th
221.128.113.4	PTR	4.113.128.221.static.pacific.net.th
221.128.113.128	PTR	128.113.128.221.static.pacific.net.th
221.128.113.129	PTR	129.113.128.221.static.pacific.net.th
221.128.116.128	PTR	128.116.128.221.static.pacific.net.th
221.128.116.129	PTR	129.116.128.221.static.pacific.net.th
221.128.116.131	PTR	131.116.128.221.static.pacific.net.th
221.128.117.3	PTR	3.117.128.221.static.pacific.net.th
221.128.124.4	PTR	smtp3.mthai.in.th
221.128.124.24	A	smtp23.mthai.in.th
221.128.124.24	A	sourceone.co.th
221.128.124.26	A	smtp25.mthai.in.th
221.128.124.27	A	smtp26.mthai.in.th
221.128.124.130	A+PTR	ns1.loftdata.com
221.128.124.130	A+PTR	ns1.thaisia.com
221.128.124.130	PTR	ns1.loftdata.net
221.128.124.131	PTR	ns2.loftdata.com
221.128.124.131	PTR	ns2.thaisia.com
221.128.124.131	PTR	ns2.loftdata.net
221.128.125.12	A	mail.inopsys.com
221.128.125.42	PTR	mailgw.isisolution.com
221.128.125.43	PTR	mail-02.mailstorages.com
221.128.125.43	PTR	ns01.idealhosting.in.th
221.128.125.43	A	mail.teca.co.th
221.128.125.103	A	mail.ns1.thaiproserver.com
221.128.125.117	A	november.nobodyknow.com
221.128.125.130	PTR	ns1.i4box.com
221.128.125.130	A	mail.go.th.com
221.128.125.130	A	mail.playtnet.com