What is the SQL Server equivalent of INET_ATON

Question

As the question says what is the SQL Server equivalent of INET_ATON from mySql. The reason I need this is because i imported a IP data base from http://ipinfodb.com

Answer 1

I came here looking for the same, and applied Paul Dixon's solution.

However, I noticed that we also have some IPv6 addresses, so I changed it a little bit:

CREATE FUNCTION [dbo].[ip2int]
(
    @ip VARCHAR(15) 
)
RETURNS INT
AS
BEGIN
DECLARE @rv INT, 
        @o1 INT, 
        @o2 INT, 
        @o3 INT, 
        @o4 INT, 
        @base INT 

IF ISNUMERIC(PARSENAME(@ip, 4) + '.0e0') =0 OR ISNUMERIC(PARSENAME(@ip, 3) + '.0e0') =0 OR ISNUMERIC(PARSENAME(@ip, 2) + '.0e0') =0 OR ISNUMERIC(PARSENAME(@ip, 1) + '.0e0') =0
    BEGIN
        set @rv = -2
    END
ELSE
    BEGIN
    SELECT 
        @o1 = CONVERT(INT, PARSENAME(@ip, 4)), 
        @o2 = CONVERT(INT, PARSENAME(@ip, 3)), 
        @o3 = CONVERT(INT, PARSENAME(@ip, 2)), 
        @o4 = CONVERT(INT, PARSENAME(@ip, 1)) 

    IF (@o1 BETWEEN 0 AND 255) 
        AND (@o2 BETWEEN 0 AND 255) 
        AND (@o3 BETWEEN 0 AND 255) 
        AND (@o4 BETWEEN 0 AND 255) 
    BEGIN      
        SELECT @base = CASE 
            WHEN @o1 < 128 THEN 
                (@o1 * 16777216) 
            ELSE 
                -(256 - @o1) * 16777216 
            END 

        SET @rv = @base +  
            (@o2 * 65536) +  
            (@o3 * 256) + 
            (@o4) 
    END 
    ELSE 
        SET @rv = -1 
    END
    RETURN @rv 

END