The Authority section indicates the server(s) that are the ultimate authority for answering DNS queries about that domain. The reason for this section is that you can query any* DNS server(s) to answer a query for you. That server may choose though to answer the query from a cache. However, if you want to ensure … Read more
You don’t specify which environment you’re running docker-compose in e.g Mac, Windows or Unix, so it will depend a little bit on what changes are needed. You also don’t specify if you’re using the default bridge network in docker on a user created bridge network. In either case, by default, Docker should try and map … Read more
Although this is somewhat of an old thread, I will jump in. I’ve bumped against the same challenge and I thought I would share the solution. So, basically the config file would populate the ‘nameservers’ instance variable of the dns.resolver.Resolver you are using. Hence, if you want to coerce your Resolver to use a particular … Read more
Registrars job is primarily to coordinate and make sure there are no duplicates in domain names. ICANN manages them. At a technical level registrars (and registries) use the Extensible Provisioning Protocol to achieve this. They do update the DNS with nameserver information but not the Root DNS servers (which is an entirely different area) only … Read more
Assume you have a CNAME record: travel-maps.example.com CNAME c.commondatastorage.googleapis.com. Browser resolves name travel-maps.example.com and gets IP for c.commondatastorage.googleapis.com, then connects to port 443 of this address. Server with this IP couldn’t possibly[1] have proper certificate for travel-maps.example.com (and all other domain names with CNAME records like this). Only example.com domain owner could get a trusted … Read more
Update 2018/5/23: Check out MichaC’s answer for a newer library that has .NET standard support. Original Answer: The ARSoft.Tools.Net library by Alexander Reinert seems to do the job pretty well. It’s available from NuGet: PM> Install-Package ARSoft.Tools.Net Import the namespace: using ARSoft.Tools.Net.Dns; Then making a synchronous lookup is as simple as: var resolver = new … Read more
This is a bit of self promotion, but I built a tool to do just this that you might find useful, called GeoPeeker. It remotely accesses a site from servers spread around the world, renders the page with webkit and sends back an image. It will also report the IP address and DNS information of … Read more
*.vcap.me VMWare maintains this for their open cloud platform.
Have you looked at all the addresses in the return, discard the ones of family InterNetworkV6 and retain only the IPv4 ones?