Robtex

Up: 123.49.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.49.60.0/23
Down right: 123.49.62.0/23

IP	Type	Hostname
123.49.60.134	A	mail.jutegenome.org
123.49.62.45	PTR	host45.btcl.net.bd
123.49.62.45	A	mail.btraccl.com
123.49.62.166	PTR	host166.btcl.net.bd
123.49.62.170	PTR	host170.btcl.net.bd
123.49.62.171	A+PTR	mail.dmphq.gov.bd
123.49.62.172	A	mail.dmp.gov.bd
123.49.62.174	A	dmphq.gov.bd
123.49.62.227	PTR	host227.btcl.net.bd
123.49.62.227	A	ep.mopa.gov.bd
123.49.62.228	PTR	mail.mopa.gov.bd
123.49.62.230	PTR	host230.btcl.net.bd
123.49.62.231	PTR	host231.btcl.net.bd
123.49.62.232	PTR	host232.btcl.net.bd
123.49.62.232	A	www.mopa.gov.bd
123.49.62.232	A	mopa.gov.bd
123.49.62.235	A	pmis.mopa.gov.bd
123.49.62.237	PTR	host237.btcl.net.bd
123.49.62.237	A	ns1.mopa.gov.bd
123.49.62.238	PTR	host238.btcl.net.bd
123.49.62.238	A	ns2.mopa.gov.bd
123.49.63.1	PTR	host1.btcl.net.bd
123.49.63.3	PTR	mail.techno-bd.net
123.49.63.3	PTR	host3.btcl.net.bd
123.49.63.4	PTR	host4.btcl.net.bd
123.49.63.5	PTR	host5.btcl.net.bd
123.49.63.6	PTR	host6.btcl.net.bd
123.49.63.14	PTR	host14.btcl.net.bd
123.49.63.15	PTR	host15.btcl.net.bd
123.49.63.18	PTR	host18.btcl.net.bd
123.49.63.19	PTR	host19.btcl.net.bd
123.49.63.21	PTR	host21.btcl.net.bd
123.49.63.34	PTR	host34.btcl.net.bd
123.49.63.35	PTR	host35.btcl.net.bd
123.49.63.36	PTR	host36.btcl.net.bd
123.49.63.39	PTR	host39.btcl.net.bd
123.49.63.40	PTR	host40.btcl.net.bd
123.49.63.65	PTR	host65.btcl.net.bd
123.49.63.66	PTR	host66.btcl.net.bd
123.49.63.67	PTR	host67.btcl.net.bd
123.49.63.76	PTR	host76.btcl.net.bd
123.49.63.77	PTR	host77.btcl.net.bd
123.49.63.78	PTR	host78.btcl.net.bd
123.49.63.79	PTR	host79.btcl.net.bd
123.49.63.100	PTR	host100.btcl.net.bd
123.49.63.131	PTR	host131.btcl.net.bd
123.49.63.132	PTR	host132.btcl.net.bd
123.49.63.136	PTR	host136.btcl.net.bd
123.49.63.137	PTR	host137.btcl.net.bd
123.49.63.146	PTR	host146.btcl.net.bd
123.49.63.150	PTR	host150.btcl.net.bd
123.49.63.151	PTR	host151.btcl.net.bd
123.49.63.152	PTR	host152.btcl.net.bd
123.49.63.153	PTR	host153.btcl.net.bd
123.49.63.156	PTR	host156.btcl.net.bd
123.49.63.158	PTR	host158.btcl.net.bd
123.49.63.162	PTR	host162.btcl.net.bd
123.49.63.165	PTR	host165.btcl.net.bd
123.49.63.166	PTR	host166.btcl.net.bd
123.49.63.167	PTR	host167.btcl.net.bd
123.49.63.169	PTR	host169.btcl.net.bd
123.49.63.170	PTR	host170.btcl.net.bd
123.49.63.172	PTR	host172.btcl.net.bd
123.49.63.173	PTR	host173.btcl.net.bd
123.49.63.177	PTR	host177.btcl.net.bd
123.49.63.193	PTR	host193.btcl.net.bd
123.49.63.194	PTR	host194.btcl.net.bd
123.49.63.195	PTR	host195.btcl.net.bd
123.49.63.196	PTR	host196.btcl.net.bd
123.49.63.198	PTR	host198.btcl.net.bd
123.49.63.202	PTR	host202.btcl.net.bd
123.49.63.204	PTR	host204.btcl.net.bd
123.49.63.210	PTR	host210.btcl.net.bd
123.49.63.213	PTR	host213.btcl.net.bd
123.49.63.215	PTR	host215.btcl.net.bd
123.49.63.221	PTR	host221.btcl.net.bd
123.49.63.228	PTR	host228.btcl.net.bd
123.49.63.231	PTR	host231.btcl.net.bd
123.49.63.232	PTR	host232.btcl.net.bd
123.49.63.235	PTR	host235.btcl.net.bd
123.49.63.236	PTR	host236.btcl.net.bd
123.49.63.240	PTR	host240.btcl.net.bd
123.49.63.243	PTR	host243.btcl.net.bd
123.49.63.251	PTR	host251.btcl.net.bd
123.49.63.252	PTR	host252.btcl.net.bd