Các câu hỏi thường gặp

function Dot2LongIP($IPaddr)
{
	if ($IPaddr == "") {
		return 0;
	} else {
		$ips = explode(".", "$IPaddr");
		return ($ips[3] + $ips[2] * 256 + $ips[1] * 256 * 256 + $ips[0] * 256 * 256 * 256);
	}
}

long Dot2LongIP(String ipstring) {
	String[] ipAddressInArray = ipstring.split("\\.");
	long result = 0;
	long ip = 0;

	for (int x = 3; x >= 0; x--) {
		ip = Long.parseLong(ipAddressInArray[3 - x]);
		result |= ip << (x << 3);
	}
	return result;
}

function Dot2LongIP(ipAddress)
{
	if (arguments.ipAddress EQ "") {
		return 0;
	} else {
		ips = ListToArray( arguments.ipAddress, "." );
		return( ( 16777216 * ips[1] ) + ( 65536 * ips[2] ) + ( 256 * ips[3] ) + ips[4] );
	}
}

public double Dot2LongIP(string DottedIP)
{
	int i;
	string [] arrDec;
	double num = 0;

	if (DottedIP == "") {
		return 0;
	} else {
		arrDec = DottedIP.Split(".");
		for (i = arrDec.Length - 1; i >= 0 ; i --) {
			num += ((int.Parse(arrDec[i])%256) * Math.Pow(256 ,(3 - i )));
		}

		return num;
	}
}

Public Function Dot2LongIP(ByVal DottedIP As String) As Double
	Dim arrDec() As String
	Dim i As Integer
	Dim intResult As Long

	If DottedIP = "" then
		Dot2LongIP = 0
	Else
		arrDec = DottedIP.Split(".")

		For i = arrDec.Length - 1 To 0 Step -1
			intResult = intResult + ((Int(arrDec(i)) Mod 256) * Math.Pow(256, 3 -i))
		Next

		Dot2LongIP = intResult
	End If
End function

use Socket;

sub dot2LongIP {
	my $ip_address = shift(@_);
	return unpack("N",inet_aton($ip_address));
}

require 'ipaddr'

def dot2LongIP(ip)
ipnum = IPAddr.new(ip)
return ipnum.to_i
end

import ipaddress

def dot2LongIP(ip):
return int(ipaddress.IPv4Address(ip))

uint32_t Dot2LongIP(char* ipstring)
{
	uint32_t ip = inet_addr(ipstring);
	uint8_t *ptr = (uint8_t *) &ip;
	uint32_t a = 0;

	if (ipstring != NULL) {
		a =  (uint8_t)(ptr[3]);
		a += (uint8_t)(ptr[2]) * 256;
		a += (uint8_t)(ptr[1]) * 256 * 256;
		a += (uint8_t)(ptr[0]) * 256 * 256 * 256;
	}

	return a;
}

CREATE FUNCTION Dot2LongIP (ip text)
	RETURNS bigint
	BEGIN
	DECLARE ipnum bigint;
	SET ipnum = (SELECT INET_ATON(ip));
	RETURN ipnum;
END

CREATE FUNCTION [dbo].[Dot2LongIP]( @IP VarChar(15) )
RETURNS BigInt
AS
BEGIN
DECLARE @ipA BigInt,
	@ipB BigInt,
	@ipC BigInt,
	@ipD BigInt,
	@ipE BigInt
SELECT @ipA = LEFT(@ip, PATINDEX('%.%', @ip) - 1 )
SELECT @ip = RIGHT(@ip, LEN(@ip) - LEN(@ipA) - 1 )

SELECT @ipB = LEFT(@ip, PATINDEX('%.%', @ip) - 1 )
SELECT @ip = RIGHT(@ip, LEN(@ip) - LEN(@ipB) - 1 )

SELECT @ipC = LEFT(@ip, PATINDEX('%.%', @ip) - 1 )
SELECT @ip = RIGHT(@ip, LEN(@ip) - LEN(@ipC) - 1 )

SELECT @ipD = @ip
SELECT @ipE = ( @ipA * 256*256*256 ) + ( @ipB * 256*256 ) + ( @ipC * 256 ) + @ipD

RETURN @ipE
END

CREATE OR REPLACE FUNCTION Dot2LongIP(text) RETURNS BIGINT AS '
SELECT
	split_part($1,''.'',1)::int8*(256*256*256)+
	split_part($1,''.'',2)::int8*(256*256)+
	split_part($1,''.'',3)::int8*256+
	split_part($1,''.'',4)::int8;'
LANGUAGE SQL;

Convert IPv4 IP Address to IP Number in Decimal Integer (IPv4 IP Address is in cell A1):
=((VALUE(LEFT(A1, FIND(".", A1)-1)))*256^3)+((VALUE(MID(A1, FIND(".", A1)+1, FIND(".", A1, FIND(".", A1)+1)-FIND(".", A1)-1)))*256^2)+((VALUE(MID(A1, FIND(".", A1, FIND(".", A1)+1)+1, FIND(".", A1, FIND(".", A1, FIND(".", A1)+1)+1)-FIND(".", A1, FIND(".", A1)+1)-1)))*256)+(VALUE(RIGHT(A1, LEN(A1)-FIND(".", A1, FIND(".", A1, FIND(".", A1)+1)+1))))

function Long2DotIP ($IPNum)
{
	if ($IPNum == "") {
		return "0.0.0.0";
	} else {
		return (($IPNum / 16777216) % 256) . "." . (($IPNum / 65536) % 256) . "." . (($IPNum / 256) % 256) . "." . ($IPNum % 256);
	}
}

String Long2DotIP(long ipnum) {
	String result = "";
	result = ((ipnum / 16777216) % 256) + "." + ((ipnum / 65536) % 256) + "." + ((ipnum / 256) % 256) + "." + (ipnum % 256);
	return result;
}

function Modulus(value1, value2) {
	return arguments.value1 - (floor(arguments.value1 / arguments.value2) * arguments.value2);
}

function Long2DotIP(ipNum) {
	return (Modulus(floor(arguments.ipNum / 16777216), 256)) & "." & (Modulus(floor(arguments.ipNum / 65536), 256)) & "." & (Modulus(floor(arguments.ipNum / 256), 256)) & "." & (Modulus(floor(arguments.ipNum), 256));
}

public string Long2DotIP(long IPNum)
{
	string result = "";
	result = ((IPNum / 16777216) % 256) + "." + ((IPNum / 65536) % 256) + "." + ((IPNum / 256) % 256) + "." + (IPNum % 256);
	return result;
}

Public Function Long2DotIP(ByVal IPNum As Long) As String
	Dim result As String = ""
	result = (Int(IPNum / 16777216) Mod 256) & "." & (Int(IPNum / 65536) Mod 256) & "." & (Int(IPNum / 256) Mod 256) & "." & (IPNum Mod 256)
	Return result
End Function

use Socket;

sub long2DotIP {
	my $ip_number = shift(@_);
	return inet_ntoa(pack("N*", $ip_number));
}

def long2DotIP(ipnum)
	return ((ipnum / 16777216) % 256).to_s + "." + ((ipnum / 65536) % 256).to_s + "." + ((ipnum / 256) % 256).to_s + "." + (ipnum % 256).to_s
end

def long2DotIP(ipnum):
return str(int(ipnum / 16777216) % 256) + "." + str(int(ipnum / 65536) % 256) + "." + str(int(ipnum / 256) % 256) + "." + str(ipnum % 256)

char* Long2DotIP(uint32_t ipnum)
{
	uint8_t bytes[4];
	char* buf = malloc (sizeof (char) * 16);
	bytes[0] = (ipnum >> 24) & 0xFF;
	bytes[1] = (ipnum >> 16) & 0xFF;
	bytes[2] = (ipnum >> 8) & 0xFF;
	bytes[3] = ipnum & 0xFF;

	snprintf(buf, (sizeof (char) * 16), "%d.%d.%d.%d", bytes[0], bytes[1], bytes[2], bytes[3]);

	return buf;
}

CREATE FUNCTION Long2DotIP (ipnum bigint)
	RETURNS text
	BEGIN
	DECLARE ip text;
	SET ip = (SELECT INET_NTOA(ipnum));
	RETURN ip;
END

CREATE FUNCTION [dbo].[Long2DotIP]( @IPNum BigInt )
	RETURNS VARCHAR(15)
	AS
	BEGIN
	RETURN CAST(((@IPNum / 16777216) % 256) AS VARCHAR(3)) +  + CAST(((@IPNum / 65536) % 256) AS VARCHAR(3)) +  + CAST(((@IPNum / 256) % 256) AS VARCHAR(3)) +  + CAST((@IPNum % 256) AS VARCHAR(3))
END

CREATE OR REPLACE FUNCTION Long2DotIP(BIGINT) RETURNS TEXT AS '
SELECT
CONCAT(($1 >> 24) % 256, ''.'', ($1 >> 16) % 256, ''.'', ($1 >> 8) % 256, ''.'', $1 % 256);'
LANGUAGE SQL;

Convert IP Number in Decimal Integer to IPv4 IP Address (Decimal Integer is in cell A1):
=IF(A1<>"", CONCATENATE(MOD(BITRSHIFT(A1, 24), 256), ".", MOD(BITRSHIFT(A1, 16), 256), ".", MOD(BITRSHIFT(A1, 8), 256), ".", MOD(A1, 256)), "")

java.math.BigInteger Dot2LongIP(String ipv6) {
	java.net.InetAddress ia = java.net.InetAddress.getByName(ipv6);
	byte byteArr[] = ia.getAddress();

	if (ia instanceof java.net.Inet6Address) {
		java.math.BigInteger ipnumber = new java.math.BigInteger(1, byteArr);
		return ipnumber;
	}
}

function Dot2LongIP(ipv6)
{
	if (arguments.ipv6 eq "") {
		return 0;
	} else {
		IPV6Long = CreateObject("java","java.math.BigInteger");
		IPV6NetAddress = CreateObject("java","java.net.InetAddress");
		newIp = IPV6NetAddress.getByName(arguments.ipv6);
		bytes = newIp.getAddress();
		bigInt = IPV6Long.init(1, bytes).toString();
		return bigInt;
	}
}

public System.Numerics.BigInteger Dot2LongIP(string ipv6)
{
	System.Net.IPAddress address;
	System.Numerics.BigInteger ipnum;

	if (System.Net.IPAddress.TryParse(ipv6, out address)) {
		byte[] addrBytes = address.GetAddressBytes();

		if (System.BitConverter.IsLittleEndian) {
			System.Collections.Generic.List<byte> byteList = new System.Collections.Generic.List<byte>(addrBytes);
			byteList.Reverse();
			addrBytes = byteList.ToArray();
		}

		if (addrBytes.Length > 8) {
			//IPv6
			ipnum = System.BitConverter.ToUInt64(addrBytes, 8);
			ipnum <<= 64;
			ipnum += System.BitConverter.ToUInt64(addrBytes, 0);
		} else {
			//IPv4
			ipnum = System.BitConverter.ToUInt32(addrBytes, 0);
		}
		return ipnum;
	}
}

Public Function Dot2LongIP(ByVal ipv6 As String) As System.Numerics.BigInteger
	Dim address As System.Net.IPAddress
	Dim ipnum As System.Numerics.BigInteger

	If System.Net.IPAddress.TryParse(ipv6, address) Then
		Dim addrBytes() As Byte = address.GetAddressBytes()

		If System.BitConverter.IsLittleEndian Then
			Dim byteList As New System.Collections.Generic.List(Of Byte)(addrBytes)
			byteList.Reverse()
			addrBytes = byteList.ToArray()
		End If

		If addrBytes.Length > 8 Then
			'IPv6
			ipnum = System.BitConverter.ToUInt64(addrBytes, 8)
			ipnum <<= 64
			ipnum += System.BitConverter.ToUInt64(addrBytes, 0)
		Else
			'IPv4
			ipnum = System.BitConverter.ToUInt32(addrBytes, 0)
		End If
	End If
	Dot2LongIP = ipnum
End Function

use NetAddr::IP;

sub dot2LongIP {
	my $ip_address = shift(@_);
	my $ip_number = NetAddr::IP->new($ip_address) or die;
	return $ip_number->bigint;
}

require 'ipaddr'

def dot2LongIP(ipv6)
	ipnum = IPAddr.new(ipv6)
	return ipnum.to_i
end

import ipaddress

def dot2LongIP(ipv6):
	return int(ipaddress.IPv6Address(ipv6))

#include <arpa/inet.h>
#include <inttypes.h>

typedef unsigned __int128 uint128_t;

uint128_t Dot2LongIP(const char* ipv6) {
	struct sockaddr_in6 sa;
	inet_pton(AF_INET6, ipv6, &(sa.sin6_addr));
	uint128_t ipnum = 0;
	uint128_t octet = 0;
	int i;
	for (i = 0; i < (sizeof(sa.sin6_addr.s6_addr) / sizeof(sa.sin6_addr.s6_addr[0])); i++) {
		octet = ((uint128_t)sa.sin6_addr.s6_addr[i] << ((uint128_t)(15 - i) * 8));
		ipnum = ipnum + octet;
	}
	return ipnum;
}

String Long2DotIP(String integer)
{
	String ipstr = new java.math.BigInteger(integer).toString(16);
	String padding = new String(new char[32 - ipstr.length()]).replace("\0", "0");
	String retval = padding + ipstr;
	retval = retval.replaceAll("(.{4})", "$1:").substring(0, 39);
	return retval;
}

function Long2DotIP(integer)
{
	if (arguments.integer eq "") {
		return 0;
	} else {
		retval = "";
		bigobj = CreateObject("java","java.math.BigInteger");
		intval = bigobj.init(integer).toString(16);
		padding = repeatstring("0", 32 - len(intval));
		retval = padding & intval;
		retval = rereplace(rereplace(retval, "(.{4})", "\1:", "ALL"), ":$", "");
		return retval;
	}
}

public string Long2DotIP(string bigint)
{
	string retval = "";
	System.Numerics.BigInteger intval = System.Numerics.BigInteger.Zero;

	if (System.Numerics.BigInteger.TryParse(bigint, out intval)) {
		retval = intval.ToString("x").PadLeft(32, '0');
		char[] trimme = new[] { ':' };
		retval = System.Text.RegularExpressions.Regex.Replace(retval, "(.{4})", "$1:").TrimEnd(trimme);
	}

	return retval;
}

Public Function Long2DotIP(ByVal bigint As String) As String
	Dim retval As String = ""
	Dim intval As System.Numerics.BigInteger = System.Numerics.BigInteger.Zero

	If System.Numerics.BigInteger.TryParse(bigint, intval) Then
		retval = intval.ToString("x").PadLeft(32, "0"c)
		Dim trimme As Char() = {":"c}
		retval = System.Text.RegularExpressions.Regex.Replace(retval, "(.{4})", "$1:").TrimEnd(trimme)
	End If

	Return retval
End Function

use Math::BigInt;

sub long2DotIP {
	my $ipnumstr = shift(@_);
	my $ipnum = Math::BigInt->new($ipnumstr);
	my $iphex = $ipnum->as_hex();
	$iphex =~ s/^0x//;
	my $ipv6 = ('0' x (32 - length($iphex))) . $iphex;
	$ipv6 =~ s/(.{4})/$1:/g;
	$ipv6 =~ s/:$//;

	return $ipv6;
}

def long2DotIP(integer)
	return integer.to_s(16).rjust(32, '0').gsub(/(.{4})/, "\1:").sub(/:$/, "")
end

import re

def long2DotIP(integer):
	retval = format(integer, 'x')
	retval = retval.zfill(32)
	retval = re.sub(r"(.{4})", r"\1:", retval)
	retval = re.sub(r":$", "", retval)
	return retval

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gmp.h>

char* Long2DotIP(char* ipnum)
{
	mpz_t bigint;
	char* buf = malloc (sizeof (char) * 33);
	char* buf2 = malloc (sizeof (char) * 40);
	int i = 0;
	int parts = 8;
	int partsize = 5;
	char **arr;
	arr = calloc(parts, sizeof *arr);

	for (i = 0; i < parts; i++)
	{
		arr[i] = calloc(partsize, sizeof *arr[i]);
	}
	mpz_init_set_str(bigint, ipnum, 10);
	gmp_snprintf(buf, (sizeof (char) * 33), "%032Zx", bigint);

	for (i = 0; i < parts; i++)
	{
		memcpy(arr[i], buf + (i * 4), 4);
	}

	snprintf(buf2, (sizeof (char) * 40), "%s:%s:%s:%s:%s:%s:%s:%s", arr[0], arr[1], arr[2], arr[3], arr[4], arr[5], arr[6], arr[7]);
	free(buf);
	free(arr);
	return buf2;
}

<?
$ipaddress = getenv('REMOTE_ADDR');
?>

<%
String ipaddress = request.getRemoteAddr();
%>

<CFCOMPONENT>
<CFSET ipaddress="#CGI.Remote_Addr#">
</CFCOMPONENT>

Public Function IpAddress()
	IpAddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
End Function

<?
if (getenv('HTTP_X_FORWARDED_FOR')) {
	$ipaddress = getenv('HTTP_X_FORWARDED_FOR');
} else {
	$ipaddress = getenv('REMOTE_ADDR');
}
?>

<%
if (request.getHeader("X_FORWARDED_FOR") == null) {
	String ipaddress = request.getRemoteAddr();
} else {
	String ipaddress = request.getHeader("X_FORWARDED_FOR");
}
%>

<CFCOMPONENT>
<CFIF #CGI.HTTP_X_Forwarded_For# EQ "">
<CFSET ipaddress="#CGI.Remote_Addr#">
<CFELSE>
<CFSET ipaddress="#CGI.HTTP_X_Forwarded_For#">
</CFIF>
</CFCOMPONENT>

public string IpAddress()
{
	string strIp;
	strIp = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

	if (strIp == null) {
		strIp = Request.ServerVariables["REMOTE_ADDR"];
	}
	return strIp;
}

Public Function IpAddress()
	Dim strIp As String
	strIp = Request.ServerVariables("HTTP_X_FORWARDED_FOR")

	If strIp = "" Then
		strIp = Request.ServerVariables("REMOTE_ADDR")
	End If

	IpAddress = strIp
End Function