Select record between two IP ranges

Question

I have a table which stores a ID, Name, Code, IPLow, IPHigh such as:

1, Lucas, 804645, 192.130.1         


        

Answer 1

I was thinking along the lines of Gordon's answer, then realized you don't actually need to mess with numbers. If you zero-pad each part of the address, a string comparison works:

DECLARE @search varchar(50) = '192.168.2.50';
WITH DATA AS (
    SELECT * FROM ( values 
            (1, 'Lucas', '192.130.1.1', '192.130.1.254'),
            (2, 'Maria', '192.168.2.1', '192.168.2.254'),
            (3, 'Julia', '192.150.3.1', '192.150.3.254')
    ) AS tbl (ID,Name,IPLow,IPHigh)
)
SELECT *
FROM DATA
WHERE REPLACE(STR(PARSENAME( @search, 4 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( @search, 3 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( @search, 2 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( @search, 1 ), 3, 0), ' ', '0')

    BETWEEN

      REPLACE(STR(PARSENAME( IPLow, 4 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( IPLow, 3 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( IPLow, 2 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( IPLow, 1 ), 3, 0), ' ', '0')

    AND

      REPLACE(STR(PARSENAME( IPHigh, 4 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( IPHigh, 3 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( IPHigh, 2 ), 3, 0), ' ', '0')
    + REPLACE(STR(PARSENAME( IPHigh, 1 ), 3, 0), ' ', '0')

You can, of course, put this inside a UDF for simplicity, though watch out for the performance hit on large queries.

CREATE FUNCTION dbo.IP_Comparable(@IP varchar(50))
RETURNS varchar(50)
WITH SCHEMABINDING
BEGIN
    RETURN REPLACE(STR(PARSENAME( @IP, 4 ), 3, 0), ' ', '0')
         + REPLACE(STR(PARSENAME( @IP, 3 ), 3, 0), ' ', '0')
         + REPLACE(STR(PARSENAME( @IP, 2 ), 3, 0), ' ', '0')
         + REPLACE(STR(PARSENAME( @IP, 1 ), 3, 0), ' ', '0')
END
GO

DECLARE @search varchar(50) = '192.168.2.50';
WITH DATA AS (
    SELECT * FROM ( values 
        (1, 'Lucas', '192.130.1.1', '192.130.1.254'),
        (2, 'Maria', '192.168.2.1', '192.168.2.254'),
        (3, 'Julia', '192.150.3.1', '192.150.3.254')
    ) AS tbl (ID,Name,IPLow,IPHigh)
)
SELECT *
FROM DATA
WHERE dbo.IP_Comparable(@search) BETWEEN dbo.IP_Comparable(IPLow) AND dbo.IP_Comparable(IPHigh)

This will avoid the issue you're having with integer overflows.