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unbound is a free and open source bsd licensed caching dns resolver. it also works with dnssec and in recursive mode. coded in c essential for the internet. every computer or mobile device use dns to access websites, email servers, apis and other stuff. one must configure a dns service. you can use your isp’s dns, google dns, and opendns. now you have one more option from ibm. it is called quad9 dns service. it can block malicious domains for everyone. you can get an additional layer of protection. operates both gsm and cdma cellular network and wired broadband in india.. dt: a command line tool to display information about your domain on linux or unix system. the dt command is free and open source tool written in go language. it is a cli dns tool that displays information about your domain name on the bsnl (bharat sanchar nigam limited) is government owned internet and cellular service provider. it is believed that bsnl has 60% market share and considered as the largest provider of fixed telephony and broadband services across the pan india. google provides an excellent set of public dns servers but it won’t work on an native ipv6 address or transport. from the official google how do i test that my bind dns server is not acting as open resolvers? how do i test if server is acting as open resolver for abusing the how do i disable the bind version.bind option under unix or linux operating systems to improve my name server security? the error message “website not reachable” means lots of things. some can be controlled from your end others can be only controlled by i‘m running bind name server on linux box but i’m not sure about version. how do i check bind version under linux operating systems? dnsknowledge offers dns tips, hacks, news, tutorials, guides, tools and much more.