Hi,
i need to check and retrive the mx records for a domain using asp .net , i am using .net 1.1 and prefer to use this framework version .
ok , i found that i should use DNS protocol to retrive various DNS records (A,MX,TXT,CNAME , etc), and here we need mx records. i found a third party library called QueryDNS to do dns queries.
the first thing we need in this scenario is a Dns Server to query , ok i used a whois website to retrive name servers for the domain and use name server ip address to query !
my problem here is : is there a programmeable way to retrive name servers for a domain ? does .net framework have such option or any free third party control ?
ok , i was thinking how IE finds name servers for a domain ? then there should be a way , i tested query a name server for domain "A" to retrive mx records for domain "B" !! yeah , it knows yahoo,google,ms n mx records but doesnt know all of domains , then it seems that i need name server for each domain . and with more research , yeah if i use dns server ip that i see in my ipconfig /all , it will give me right answers for all domains but it is a little slower than using the domain own name server .
is there anyway to get this name server address simply ?
and i am wonder how nslookup finds the right name server to query ?!!?
3  2169  Plater 7,872
Recognized Expert Expert
You should be able to request DNS records of a given type, for a given domain name from a given nameserver. I am not sure if .NET has any "nice" way of doing it, but the console program NSLOOKUP can be made to run that way.
Yes Plater , .net has no way to retrieve name servers in a nice way ,but i am wonder there is no way to get these information in a network way , we have whois protocol , is there any nice code to extract name servers from whois query in asp .net ?
or some one know how nslookup finds name servers ?
and also is it possible to use nslookup command from a shared hosting account via asp .net ?
Plater 7,872
Recognized Expert Expert
If it really comes down to it, you could create the dns query packet yourself from the RFC documentation, but that would not be easy
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