/// <summary>
/// Retuns true if the ip address is one of the following
/// IANA-reserved private IPv4 network ranges (from http://en.wikipedia.org/wiki/IP_address)
/// Start End
/// 10.0.0.0 10.255.255.255
/// 172.16.0.0 172.31.255.255
/// 192.168.0.0 192.168.255.255
/// </summary>
/// <returns></returns>
public static bool IsOnIntranet(this IPAddress ipAddress)
{
if (empty.Equals(ipAddress))
{
return(false);
}
bool onIntranet = IPAddress.IsLoopback(ipAddress);
onIntranet = onIntranet || ipAddress.Equals(ipAddress.And(intranetMask1)); //10.255.255.255
onIntranet = onIntranet || ipAddress.Equals(ipAddress.And(intranetMask4)); ////192.168.255.255
onIntranet = onIntranet || (intranetMask2.Equals(ipAddress.And(intranetMask2)) &&
ipAddress.Equals(ipAddress.And(intranetMask3)));
return(onIntranet);
}
/// <summary>
/// Determines whether the IP address is in the same subnet as the
/// specified IP address.
/// </summary>
/// <param name="address">The IPAddress instance this is being called
/// for.</param>
/// <param name="other">The IP address to determine whether it is in the same
/// subnet.</param>
/// <param name="netmask">The subnetmask to apply.</param>
/// <returns>true if both IP address are located in the same subnet; Otherwise
/// false.</returns>
/// <exception cref="ArgumentNullException">The other parameter or the netmask
/// parameter is null.</exception>
/// <exception cref="ArgumentException">The netmask and IP address must be
/// of the same address family.</exception>
/// <remarks>This is an extension method for the IPAddress class.</remarks>
public static bool InSameSubnet(this IPAddress address, IPAddress other,
IPAddress netmask)
{
other.ThrowIfNull("other");
netmask.ThrowIfNull("netmask");
return(address.And(netmask).Equals(other.And(netmask)));
}