Uri.Host Property

public:
 property System::String ^ Host { System::String ^ get(); };

public string Host { get; }

member this.Host : string

Public ReadOnly Property Host As String

Property Value

The host name. This is usually the DNS host name or IP address of the server.

Exceptions

Examples

The following example writes the host name (www.contoso.com) of the server to the console.

Uri baseUri = new Uri("http://www.contoso.com:8080/");
Uri myUri = new Uri(baseUri, "shownew.htm?date=today");

Console.WriteLine(myUri.Host);

let baseUri = Uri "http://www.contoso.com:8080/"
let myUri = Uri(baseUri, "shownew.htm?date=today")

printfn $"{myUri.Host}"

Dim baseUri As New Uri("http://www.contoso.com:8080/")
Dim myUri As New Uri(baseUri,"shownew.htm?date=today")
       
Console.WriteLine(myUri.Host)

The following example shows how Host and IdnHost differ across DNS, IDN, IPv4, and IPv6 inputs:

// Demonstrate differences between Host, IdnHost, and DnsSafeHost.

// Example 1: Regular hostname (ASCII).
Console.WriteLine("Example 1: Regular ASCII hostname");
Uri uri1 = new Uri("http://www.contoso.com:8080/path");
Console.WriteLine($"  Host:        {uri1.Host}");        // www.contoso.com
Console.WriteLine($"  IdnHost:     {uri1.IdnHost}");     // www.contoso.com
Console.WriteLine($"  DnsSafeHost: {uri1.DnsSafeHost}"); // www.contoso.com
Console.WriteLine();

// Example 2: International domain name (non-ASCII).
Console.WriteLine("Example 2: International domain name");
Uri uri2 = new Uri("http://münchen.de/path");
Console.WriteLine($"  Host:        {uri2.Host}");        // münchen.de (original)
Console.WriteLine($"  IdnHost:     {uri2.IdnHost}");     // xn--mnchen-3ya.de (punycode)
Console.WriteLine($"  DnsSafeHost: {uri2.DnsSafeHost}"); // münchen.de or xn--mnchen-3ya.de, depending on configuration.
Console.WriteLine();

// Example 3: International domain name already in punycode (encoded) form.
Console.WriteLine("Example 3: Already-encoded international domain name");
Uri uri2Encoded = new Uri("http://xn--mnchen-3ya.de/path");
Console.WriteLine($"  Host:        {uri2Encoded.Host}");        // xn--mnchen-3ya.de (as provided)
Console.WriteLine($"  IdnHost:     {uri2Encoded.IdnHost}");     // xn--mnchen-3ya.de (already punycode)
Console.WriteLine($"  DnsSafeHost: {uri2Encoded.DnsSafeHost}"); // xn--mnchen-3ya.de
Console.WriteLine();

// Example 4: IPv6 address without zone ID.
Console.WriteLine("Example 4: IPv6 address without zone ID");
Uri uri3 = new Uri("http://[::1]:8080/path");
Console.WriteLine($"  Host:        {uri3.Host}");        // [::1] (with brackets)
Console.WriteLine($"  IdnHost:     {uri3.IdnHost}");     // ::1 (without brackets)
Console.WriteLine($"  DnsSafeHost: {uri3.DnsSafeHost}"); // ::1 (without brackets)
Console.WriteLine();

// Example 5: IPv6 link-local address with zone ID.
Console.WriteLine("Example 5: IPv6 link-local address with zone ID");
Uri uri4 = new Uri("http://[fe80::1%10]:8080/path");
Console.WriteLine($"  Host:        {uri4.Host}");        // [fe80::1] (with brackets, no zone ID)
Console.WriteLine($"  IdnHost:     {uri4.IdnHost}");     // fe80::1%10 (without brackets, with zone ID)
Console.WriteLine($"  DnsSafeHost: {uri4.DnsSafeHost}"); // fe80::1%10 (without brackets, with zone ID)
Console.WriteLine();

// Example 6: IPv4 address.
Console.WriteLine("Example 6: IPv4 address");
Uri uri5 = new Uri("http://192.168.1.1:8080/path");
Console.WriteLine($"  Host:        {uri5.Host}");        // 192.168.1.1
Console.WriteLine($"  IdnHost:     {uri5.IdnHost}");     // 192.168.1.1
Console.WriteLine($"  DnsSafeHost: {uri5.DnsSafeHost}"); // 192.168.1.1

Remarks

Unlike the Authority property, this property value does not include the port number.

The value returned by this property depends on the host type:

• For DNS host names (including international domain names): Returns the escaped input. Non-ASCII characters are returned as-is and aren't punycode encoded.
• For IPv6 addresses: Returns the address enclosed in square brackets (for example, [::1]), but doesn't include the zone ID (scope) even if one was specified in the original URI.
• For IPv4 addresses: Returns the dotted-decimal notation (for example, 192.168.1.1).

For DNS resolution or other lower-level networking scenarios, use IdnHost instead, which returns a punycode-encoded form for valid international domain names and includes the zone ID (without brackets) for IPv6 addresses. Use Host when you want the host as it appears in the URI (for example, for display or comparison).