How do I do a dns lookup ?

[peak]

I need to obtain the ip from an email address, any ideas?

 

[Imran Koradia]

I need to obtain the ip from an email address, any ideas?

strip out the domain name from the email address:
(untested - watch for typos, syntax, etc - directly typing in here..)

' this should give you mydomain.com
Dim strEmail As String = "(e-mail address removed)"
Dim strDomain As String = _
strEmail.SubString(strEmail.IndexOf("@"c)+1, _
strEmail.Length - strEmail.IndexOf("@"c))

Then use the methods in System.Net.Dns class to retrieve the IP address:

For Each ip As System.Net.IPAddress _
In System.Net.Dns.GetHostByName(strDomain).AddressList
MessageBox.Show(ip.ToString)
Next ip

Note that a domain could have multiple IP addresses associated with it which
is why we need the loop.

hope that helps..
Imran.

 

[peak]

Hi,
This seems to return the www server instead of the smtp server,
here is what I typed

Dim ip As System.Net.IPAddress
Dim strDomain = "tiscali.co.uk"
For Each ip In System.Net.Dns.GetHostByName(strDomain).AddressList
MsgBox(ip.ToString)
Next ip
End

I am expecting to get the ip of
smtp.tiscali.co.uk
and instead I am getting the ip of
www.tiscali.co.uk

Any ideas?

 

[Ron L]

Peak
It is likely that tiscali.co.uk and www.tiscali.co.uk are aliases for
the same IP address. If you want the IP address for smtp.tiscali.co.uk, I
would suggest that that be what you submit as the strDomain.

Good Luck.
Ron L

 

[peak]

This is not what I am looking for. Every smtp server knows
how to obtain the smtp address for *any* email address.
This is known I understand as dns email lookup or dns
mx record lookup. This is what I need.
I have done some research since I initially posted this
question, and it seems that someone wrote how to do this
in C#. Here is the link, maybe someone can show how
this would look like in VB:
http://www.csharphelp.com/archives/archive43.html?printable=yes


Tia