IP地址 与 十进制 IP Number 互转（IPv4/IPv6）

IPv4 到 IP Number 转换公式与代码

IP Number = 16777216*w + 65536*x + 256*y + z     (1)

where

IP Address = w.x.y.z


For example, if the IP address is "202.186.13.4", then its IP Number will be "3401190660", based on the formula (1).

IP Address = 202.186.13.4

So, w = 202, x = 186, y = 13 and z = 4

IP Number = 16777216*202 + 65536*186 + 256*13 + 4
		  = 3388997632 + 12189696 + 3328 + 4
		  = 3401190660

PHP 代码

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);
    }
}

Java 代码

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;
}

MySQL 代码

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

IP Number 到 IPv4 转换公式

IP Address = w.x.y.z

To reverse IP number to IP address,

w = int ( IP Number / 16777216 ) % 256
x = int ( IP Number / 65536    ) % 256
y = int ( IP Number / 256      ) % 256
z = int ( IP Number            ) % 256


where
%
is the modulus operator and
int
returns the integer part of the division.

PHP 代码

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

Java 代码

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

MySQL代码

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

 

IPv6 到 IP Number 转换公式

IP Number = (65536^7)*a + (65536^6)*b + (65536^5)*c + (65536^4)*d + (65536^3)*e + (65536^2)*f + 65536*g + h     (1)

where

IP Address = a:b:c:d:e:f:g:h


For example, if the IP address is "2001:0db8:0000:0042:0000:8a2e:0370:7334", then its IP Number will be "42540766411282594074389245746715063092", based on the formula (1).

IP Address (in hexadecimal) = 2001:0db8:0000:0042:0000:8a2e:0370:7334
IP Address (in decimal)     = 8193:3512:0:66:0:35374:880:29492

IP Number = (65536^7)*8193 + (65536^6)*3512 + (65536^5)*0 + (65536^4)*66 + (65536^3)*0 + (65536^2)*35374 + 65536*880 + 29492
          = 5192296858534827628530496329220096*8193 + 79228162514264337593543950336*3512 + 1208925819614629174706176*0 + 18446744073709551616*66 + 281474976710656*0 + 4294967296*35374 + 57671680 + 29492
          = 42540488161975842760550356425300246528 + 278249306750096353628526353580032 + 0 + 1217485108864830406656 + 0 + 151930173128704 + 57671680 + 29492
          = 42540766411282594074389245746715063092

PHP 代码

function Dot2LongIP($ipv6) {
	return (string) gmp_import(inet_pton($ipv6));
}

Java 代码

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;
	}
}

 

IP Number 到 IPv6 转换公式

IP Address = a:b:c:d:e:f:g:h

To reverse IP number to IP address,

a = int ( IP Number / (65536^7) ) % 65536
b = int ( IP Number / (65536^6) ) % 65536
c = int ( IP Number / (65536^5) ) % 65536
d = int ( IP Number / (65536^4) ) % 65536
e = int ( IP Number / (65536^3) ) % 65536
f = int ( IP Number / (65536^2) ) % 65536
g = int ( IP Number / 65536 ) % 65536
h = IP Number % 65536


where
%
is the modulus operator and
int
returns the integer part of the division.

NOTE: All parts need to be converted into hexadecimal to be part of the IPv6 address.

PHP 代码

function Long2DotIP($integer) {
	return inet_ntop(str_pad(gmp_export($integer), 16, "\0", STR_PAD_LEFT));
}

Java 代码

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;
}

 

内容整理自：https://lite.ip2location.com/faqs