How to know get the IP address from the FTP address

Question

This is my ftp:

ftp://192.168.2.4

I want to take the 192.168.2.4

What I tried

string ipAddress = FTPAddress.Substring(5,11)

that works

The problem

as you see, I set the length to 11, however, when I change the ftp address, that 11 won't work and I would need the new ftp address length. could you help please

maybe reguralr expression?

Update

Sometimes the ftp address could be like this: ftp://ip/folder

Possible Regex for IP: `\b(?:\d{1,3}\.){3}\d{1,3}\b` (does not check if all bytes are <= 255) — Flat Eric, Dec 24 '14 at 10:24

score 6 · Answer 1 · answered Dec 24 '14 at 10:25

6

Create an Uri object. IP address will be in Host property.

Uri link = new Uri("ftp://192.168.2.4");
string IpAddress = link.Host;

Uri class can also provide more useful information.

answered Dec 24 '14 at 10:25

opewix

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score 6 · Answer 2 · edited May 23 '17 at 10:33

You can use the URI Class for handling the address then use the Host Property to read that portion of it.

Uri ftpAddress = new Uri("ftp://192.168.2.4");
string ipAddress = ftpAddress.Host;

And if you need to convert Hostnames to IPAddresses the following extension class might help (based on this Answer):

public static class UriHostResolveExtension
{
    public static String ResolveHostnameToIp(this Uri uri)
    {
        if (uri.HostNameType == UriHostNameType.Dns)
        {
            IPHostEntry hostEntry = Dns.GetHostEntry(uri.Host);
            if (hostEntry.AddressList.Length > 0)
                return hostEntry.AddressList[0].ToString();
        }
        return uri.Host;
    }
}

Can be used in the following scenario:

Uri ftpAddress = new Uri("ftp://example.com/");
string ipAddress = ftpAddress.ResolveHostnameToIp();

How to know get the IP address from the FTP address

What I tried

The problem

Update

2 Answers2