From RFC 5737 The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2), and 203.0.113.0/24 (TEST-NET-3) are provided for use in documentation. From RFC 3849 IANA is to record the allocation of the IPv6 global unicast address prefix 2001:DB8::/32 as a documentation-only prefix in the IPv6 address registry. No end party is to be assigned this address.
For IPv4 addresses, you may want to store them as an int unsigned and use the INET_ATON() and INET_NTOA() functions to return the IP address from its numeric value, and vice versa. Example: SELECT INET_ATON(‘127.0.0.1’); +————————+ | INET_ATON(‘127.0.0.1’) | +————————+ | 2130706433 | +————————+ 1 row in set (0.00 sec) SELECT INET_NTOA(‘2130706433’); +————————-+ | INET_NTOA(‘2130706433’) … Read more
foreach(NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces()) { if(ni.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet) { Console.WriteLine(ni.Name); foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses) { if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork) { Console.WriteLine(ip.Address.ToString()); } } } } This should get you what you want. ip.Address is an IPAddress, that you want.
You can use this to try and parse it: IPAddress.TryParse Then check AddressFamily which Returns System.Net.Sockets.AddressFamily.InterNetwork for IPv4 or System.Net.Sockets.AddressFamily.InterNetworkV6 for IPv6. EDIT: some sample code. change as desired: string input = “your IP address goes here”; IPAddress address; if (IPAddress.TryParse(input, out address)) { switch (address.AddressFamily) { case System.Net.Sockets.AddressFamily.InterNetwork: // we have IPv4 break; case … Read more
I am not sure if you can grab that IP from code that runs on the local machine. You can however build code that runs on a website, say in JSP, and then use something that returns the IP of where the request came from: request.getRemoteAddr() Or simply use already-existing services that do this, then … Read more
Using C#, With webclient its a short one. public static void Main(string[] args) { string externalIpString = new WebClient().DownloadString(“http://icanhazip.com”).Replace(“\\r\\n”, “”).Replace(“\\n”, “”).Trim(); var externalIp = IPAddress.Parse(externalIpString); Console.WriteLine(externalIp.ToString()); } Command Line (works on both Linux and Windows) wget -qO- http://bot.whatismyipaddress.com OR curl http://ipinfo.io/ip
Yes, it’s safe. It is the source IP of the TCP connection and can’t be substituted by changing an HTTP header. One case you may want to be worry of is if you are behind a reverse proxy in which case the REMOTE_ADDR will always be the IP of the proxy server and the user … Read more
There are free, easy APIs you can use, like those: http://ipinfodb.com/ip_location_api.php http://www.ipgeo.com/api/ http://ip2.cc/ http://www.geobytes.com/IpLocator.htm https://iplocate.io/ and plenty others. Which one looks the most trustworthy is up to you 🙂 Otherwise, there are scripts which are based on local databases on your server. The database data needs to be updated regularly, though. Check out this one: … Read more
TCP’s primary design goal is to allow reliable data communication in the face of packet loss, packet reordering, and — key, here — packet duplication. It’s fairly obvious how a TCP/IP network stack deals with all this while the connection is up, but there’s an edge case that happens just after the connection closes. What … Read more
Use inet_ntop() and inet_pton() if you need it other way around. Do not use inet_ntoa(), inet_aton() and similar as they are deprecated and don’t support ipv6. Here is a nice guide with quite a few examples. // IPv4 demo of inet_ntop() and inet_pton() struct sockaddr_in sa; char str[INET_ADDRSTRLEN]; // store this IP address in sa: … Read more