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Sunday, 30 December 2012

Converting numerical IP addresses to dotted form

I needed to convert some numerical IP addresses to a human understandable form the other day. After writing a Groovy script to do this, I found a simpler way; use built in database functions. For example, MySQL has the function INET_NTOA() to convert IP addresses from numerical to dotted form. It is called using a select statement like this.

select INET_NTOA('123456789') as ipaddress;

This returns the value '' and can be called using the "Read Database" operator.

Obviously, you would use parameters to construct the query in the general case and a loop would be needed to iterate over multiple examples. Performance might be slow for large data sets.

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