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Is there a way in c# to check if the app is running on localhost (as opposed to a production server)?

I am writing a mass mailing program that needs to use a certain mail queue is it's running on localhost.

if (Localhost)
Queue = QueueLocal;
Queue = QueueProduction;

Use a value in the application configuration file that will tell you what environment you are on.

Since you are using, you can utilize config file transforms to ensure the setting is correct for each of your environments.

How to Check If User Is on Localhost in PHP?, Manually Setting a Flag to Determine Local and Production Environments. One particularly useful application of checking if we're on localhost or� The first, in our case, is “” This IP address is otherwise known as “localhost” or a “loopback address,” and any process listening to ports here is communicating internally on your local network without using any network interface. The actual port is the number you see after the colon (see image below).

As a comment has the correct solution I'm going to post it as an answer:


php check if localhost – web-profile, php check if localhost. Output debug info only on localhost with IP='':. <? php if( in_array( $_SERVER['REMOTE_ADDR'], array( '', '::1' )� Step 1 – Find Your Local IP Address You find houses by their addresses, and you find computers by their IP addresses. It is basically the same principle. In order for us to expose your “offline” site to the internet, we need to point whoever requests to see it in the right direction.

What about something like:

public static bool OnTestingServer()
        string host = HttpContext.Current.Request.Url.Host.ToLower();
        return (host == "localhost");

What is localhost? How to connect to, test, .example or .invalid,., .localhost is a top-level domain reserved for documentation and testing purposes. When you try to access the domain,� Localhost ip address is constant, you can use it to determines if it´s localhost or remote user. But beware, if you are logged in the production server, it will be considered localhost too. This covers IP v.4 and v.6:

See if this works:

public static bool IsLocalIpAddress(string host)
  { // get host IP addresses
    IPAddress[] hostIPs = Dns.GetHostAddresses(host);
    // get local IP addresses
    IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

    // test if any host IP equals to any local IP or to localhost
    foreach (IPAddress hostIP in hostIPs)
      // is localhost
      if (IPAddress.IsLoopback(hostIP)) return true;
      // is local address
      foreach (IPAddress localIP in localIPs)
        if (hostIP.Equals(localIP)) return true;
  catch { }
  return false;


How to Test on a Local Machine, For example, if your hosts file has the line 'testing', then you can access localhost in a test via 'http://testing/'. Launch a test using your local IP address. It is assumed that MySQL is installed. In case it is not installed, “Command not found” errors will be encountered which would mean MySQL It is assumed here that the PATH environment variable contains the location to the bin folder where MySQL is installed. If MySQL is not installed

Localhost ip address is constant, you can use it to determines if it´s localhost or remote user.

But beware, if you are logged in the production server, it will be considered localhost too.

This covers IP v.4 and v.6:

public static bool isLocalhost( )
    string ip = System.Web.HttpContext.Current.Request.UserHostAddress;
    return (ip == "" || ip == "::1");

To be totally sure in which server the code is running at, you can use the MAC address:

public string GetMACAddress()
    NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
    String sMacAddress = string.Empty;
    foreach (NetworkInterface adapter in nics)
        if (sMacAddress == String.Empty)// only return MAC Address from first card  
            IPInterfaceProperties properties = adapter.GetIPProperties();
            sMacAddress = adapter.GetPhysicalAddress().ToString();
    } return sMacAddress;


And compare with a MAC address in web.config for example.

public static bool isLocalhost( )
    return GetMACAddress() == System.Configuration.ConfigurationManager.AppSettings["LocalhostMAC"].ToString();

What is a localhost?, For example, typing: ping localhost would ping the local IP address of 127.0. 0.1 (the loopback address). When setting up a web server or software on a web server, 127.0. I want to know if there is a recommended way of determining if an asp application is running locally. At the moment I use the Request object and do a string search for localhost or on the server variable but this has several limitations. The biggest one being that the Request object is not always available when I need it.

Check Local IP Address [C#], If any host IP equals to any of local IPs, the host is a local IP. It also checks whether the host is a loopback address (localhost / [C#] public static bool� I would suggest rephrasing the question because in a sense all machines are "localhost". The question should be; How do I run different code paths depending on which machine it is executed on. In my opinion, the easiest way is to create a file called DEVMACHINE or whatever you want really and then simply check. file_exists('DEVMACHINE')

PHP, Check if we are in a local environment. function is_localhost() {. // set the array for testing the local environment. $whitelist = array( '', '::1' );. // check if� openssl x509 -req -in localhost.csr -CA rootCA.pem -CAkey rootCA.key -CAcreateserial -out localhost.crt -days 735 -sha256. After the above process, you will have another file localhost.crt. This is the certificate encrypted with SHA 256-bit Algorithm and trusted and self-signed by you.

Verifying Which Ports Are Listening, nmap -sT -O localhost However, there is also a mystery service on port 834. To check if the port is associated with the official list of known services, type:� Check whether an IP address is local The following method checks if a given host name or IP address is local. First, it gets all IP addresses of the given host, then it gets all IP addresses of the local computer and finally it compares both lists. If any host IP equals to any of local IPs, the host is a local IP.