If you're going to be doing a lot of Geotargeting or IP Address Lookups, please take a feed instead which will preserve both our bandwidth and your bandwidth.

Your IP Address: 38.103.63.61

UNITED STATES
IP found in 0.0012 seconds

Is this wrong? Make a correction
Are you a host? Netblock upload

Simple GET

That said, there is an easy HTTP oriented API to locate IP addresses and Geocode them. If you don't supply the "?ip=aa.bb.cc.dd" bit, then the ip address lookup of the calling machine will be located instead (here, the aa,bb,cc,dd are decimal digits). If you add &position=true to the end of the URL then latitude and longitude will be returned also. Both HTML and XML formats are supplied for your convenience.

http://api.hostip.info/country.php
  US

http://api.hostip.info/get_html.php?ip=12.215.42.19
  Country: UNITED STATES (US)
  City: Sugar Grove, IL

http://api.hostip.info/get_html.php?ip=12.215.42.19&position=true
  Country: UNITED STATES (US)
  City: Sugar Grove, IL
  Latitude: 41.7696
  Longitude: -88.4588

http://api.hostip.info/?ip=12.215.42.19
  [use the URL above for an example - XML too long to paste below]
		

Country Flag

Paste the following code into your HTML to get a country flag of the ip address. The database is significantly more accurate (it ought to be 100%) for countries than for cities. It would be nice if y'all would make the flag a link to the www.hostip.info home page (http://www.hostip.info/) so they can come by if they're interested - it'll only benefit you in the long run. After all, the results get more accurate as more visitors submit their IP addresses!

Flag of visitor's location:

<A HREF="http://www.hostip.info">
 <IMG SRC="http://api.hostip.info/flag.php" BORDER="0" ALT="IP Address Lookup">
</A>
		

Flag of any IP address:

<A HREF="http://www.hostip.info">
 <IMG SRC="http://api.hostip.info/flag.php?ip=12.215.42.19" ALT="IP Address Lookup">
</A>
		

Quality outside resource to check out (also using this technology): Movie Reviews - Thousands Of Quality Movie Reviews

*NIX Shell Script

You can use the following shell script to call in your favorite *NIX environment.

 #!/bin/tcsh -f
lynx -dump "http://api.hostip.info/get_html.php?ip=$1"
		

Commercial Geodatabase

MaxMind - If you're looking for a commercial option, this database maintains a great level of accuracy.

Some related sites

If you need some examples, here are some sites that use us (or have at some point).

Online Encyclopedia - Updated Crystal Reference Encyclopedia
Nations Encyclopedia - Detailed resource of World Nations
Webmaster Forums - Large Webmaster Forums & Resource Directory
Musician Guide - biographies of famous musicians
Abstracts - Thousands of Citations and Abstracts on Various Subjects
Medicare Providers
Nursing Homes
State Universities - Directory of State Universities