IPInfoDB  provides a number of services that could be useful when developing a website including:

• Web based IP geolocation lookup
• IP geolocation API (XML, JSON and CSV format)
• API that generate IP CIDR by country for iptables or htaccess blocklist
• E-commerce fraud detection API

For example http://www.ipinfodb.com/ip_query.php?ip=82.27.34.78&output=xml&timezone=false will return the following XML.

<response>
<ip>82.27.34.78</ip>
<status>OK</status>
<countrycode>GB</countrycode
<countryname>United Kingdom</countryname>
<regioncode>Q5</regioncode>
<regionname>York</regionname>
<city>Dewsbury</city>
<zippostalcode />
<latitude>53.7</latitude>
<longitude>-1.6167</longitude>
</response>

This could be useful in identifying who your local customers are and respond with an appropriate message. Likewise if they reside a distance away could tailor the message to suit, for example you offer postage to that location

See www.ipinfodb.com for more information.