Robtex

Up: 27.131.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 27.131.12.0/23
Down right: 27.131.14.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
27.131.12.2	A+PTR	dns1.dfnbd.net
27.131.12.2	A	mail.dfnbd.net
27.131.12.2	A	dns2.sanjaybd.com
27.131.12.3	PTR	bkdcns1
27.131.12.3	PTR	bkdcns1.dfnbd.net
27.131.12.3	A	bkdcns1.bkdc.net
27.131.12.6	PTR	27.131.12-6-noc.dfnbd.net
27.131.12.9	PTR	27.131.12-9-noc.dfnbd.net
27.131.12.10	PTR	27.131.12-10-noc.dfnbd.net
27.131.12.12	PTR	27.131.12-12-noc.dfnbd.net
27.131.12.14	PTR	27.131.12-14-users.dfnbd.net
27.131.12.35	PTR	27.131.12-35-servers.dfnbd.net
27.131.12.35	A	wap.dfnclub.mobi
27.131.12.74	PTR	27.131.12-74-servers.dfnbd.net
27.131.12.98	PTR	27.131.12-98-servers.dfnbd.net
27.131.12.194	PTR	27.131.12-194-users.dfnbd.net
27.131.13.2	A+PTR	dns2.dfnbd.net
27.131.13.2	A	ns1.bdmatrix.net
27.131.13.2	A	mail.bdmatrix.net
27.131.13.3	PTR	27.131.13-3-servers.dfnbd.net
27.131.13.5	PTR	27.131.13-5-noc.dfnbd.net
27.131.13.6	PTR	27.131.13-6-servers.dfnbd.net
27.131.13.7	PTR	27.131.13-7-noc.dfnbd.net
27.131.13.9	PTR	27.131.13-9-servers.dfnbd.net
27.131.13.10	PTR	27.131.13-10-servers.dfnbd.net
27.131.13.13	PTR	27.131.13-13-noc.dfnbd.net
27.131.13.26	PTR	27.131.13-26-servers.dfnbd.net
27.131.13.38	PTR	27.131.13-38-servers.dfnbd.net
27.131.13.106	PTR	27.131.13-106-servers.dfnbd.net
27.131.13.110	PTR	27.131.13-110-servers.dfnbd.net
27.131.14.6	PTR	27.131.14-6-noc.dfnbd.net
27.131.14.10	PTR	27.131.14-10-noc.dfnbd.net
27.131.14.14	PTR	27.131.14-14-noc.dfnbd.net
27.131.14.20	PTR	27.131.14-20-users.dfnbd.net
27.131.14.26	PTR	27.131.14-26-users.dfnbd.net
27.131.14.26	A	imex.com.bd
27.131.14.26	A	index.com.bd
27.131.14.27	PTR	27.131.14-27-users.dfnbd.net
27.131.14.29	PTR	27.131.14-29-users.dfnbd.net
27.131.14.62	PTR	27.131.14-62-clients.dfnbd.net
27.131.14.77	PTR	27.131.14-77-clients.dfnbd.net
27.131.14.77	A	mlngroup.net
27.131.14.77	A	smartadmission.info
27.131.14.78	PTR	27.131.14-78-clients.dfnbd.net
27.131.14.102	PTR	27.131.14-102-clients.dfnbd.net
27.131.14.107	A	mail.omegadistributionltd.com
27.131.14.115	PTR	27.131.14-115-users.dfnbd.net
27.131.14.132	PTR	27.131.14-132-clients.dfnbd.net
27.131.14.182	PTR	27.131.14-182-users.dfnbd.net
27.131.14.182	A	index.com.bd
27.131.14.182	A	greenhealth-hospital.com
27.131.14.183	PTR	27.131.14-183-clients.dfnbd.net
27.131.14.194	PTR	27.131.14-194-users.dfnbd.net
27.131.14.198	PTR	27.131.14-198-users.dfnbd.net
27.131.15.12	PTR	27.131.15-12-clients.dfnbd.net
27.131.15.12	A	campaign.lollipops.mobi
27.131.15.12	A	lollipops.mobi
27.131.15.66	PTR	27.131.15-66-clients.dfnbd.net
27.131.15.118	PTR	27.131.15-118-users.dfnbd.net
27.131.15.146	PTR	27.131.15-146-clients.dfnbd.net
27.131.15.174	PTR	27.131.15-174-clients.dfnbd.net
27.131.15.178	PTR	27.131.15-178-clients.dfnbd.net
27.131.15.210	PTR	27.131.15-210-users.dfnbd.net
27.131.15.243	PTR	27.131.15-243-clients.dfnbd.net
27.131.15.246	PTR	27.131.15-246-clients.dfnbd.net
27.131.15.247	PTR	27.131.15-247-noc.dfnbd.net
27.131.15.248	PTR	27.131.15-248-noc.dfnbd.net
27.131.15.250	PTR	27.131.15-250-clients.dfnbd.net