Hashemian Blog Web Tools, Financial Markets, Technology Sunday, August 19, 2007 IP address and Host name Scripts  As some of you know, this site contains several utilities in the tools section. One of these tools is JavaScript Visitor IP Address and Host Name. It's a simple JavaScript block that can be placed inside any web page and it displays or prints the visitor's IP address and host name. As is with the rest of the tools, this one was also born out of necessity and I decided to share it with everyone. But some people are not comfortable putting my scripts on their site. That's cool and I don’t blame them, they don’t know me. So here I am going to explain how to display or print the user's IP address and host name using a number of server-side technologies. The keyword here is "server-side". That's right, there is no way you can glean that information from client-side JavaScript. Even my JavaScript utility uses server-side calls to obtain the data and then packages it up in JavaScript format and streams it back. If your site supports server-side scripting, then chances are one of the following will do the job for you. Perl: print "IP: $ENV{'REMOTE_ADDR'}<br>Host: $ENV{'REMOTE_HOST'}"; SSI: IP: <!--#echo var="REMOTE_ADDR"--><br>Host: <!--#echo var="REMOTE_HOST"--> PHP: <?= "IP: {$_SERVER['REMOTE_ADDR']}<br>Host: {$_SERVER['REMOTE_HOST']}" ?> ASP: <%= "IP: " + Request.ServerVariables("REMOTE_ADDR") + "<br>Host: " + Request.ServerVariables("REMOTE_HOST") %> ASP.NET: <%= "IP: " + Request.UserHostAddress + "<br>Host: " + Request.UserHostName %> Python: print "IP: " + cgi.os.environ["REMOTE_ADDR"] + "<br>Host: " + cgi.os.environ["REMOTE_HOST"] Ruby: print "IP: " + ENV["REMOTE_ADDR"] + "<br>Host: " + ENV["REMOTE_HOST"] JSP: <%= "IP: " + request.getRemoteAddr() + "<br>Host: " + request.getRemoteHost() %> Java Servlet: out.println("IP: " + request.getRemoteAddr() + "<br>Host: " + request.getRemoteHost()); A common issue with the above calls is that in many cases host names may be returned as IP addresses or nothing at all. In some cases that is because no reverse record for a client's IP address is available. But if this issues occurs all the time, it could mean that reverse resolution is turned off. This is generally done for performance reason, to save on server resources. You can ask your hosting company to turn that service on, or you could configure reverse lookup yourself if you have access to the server configuration files. Here’s how reverse look up is switched on for Internet Information Server (IIS) and Apache. IIS (execute at command line): adsutil set w3svc/EnableReverseDNS TRUE Apache (edit httpd.conf file): HostnameLookups On By the way, if you ever wanted to run a simple reverse lookup on an IP address, here's a Reverse Whois tool for that job. Before I end this post, here's one more piece of information for those who might wonder where parameters like REMOTE_ADDR or REMOTE_HOST come from. Those are part of a collection of parameters known as environment variables that web servers are expected to make available to the scripts. Want the gory details? Read here. There you have it. If you can put any of the above scripts to use instead of using my JavaScript utility, I'd appreciate the bandwidth savings. And to those who continue to use my utilities, your trust and confidence are appreciated. javascript,server-side scripting,ip address,hostname,perl,ssi,asp,ruby,python,jsp,servlet Labels: hostname, ip address, javascript, jsp, perl, python, ruby, servlet, ssi <IP address and Host name Scripts> // posted by rh 0 comments | 0 Comments: Post a Comment

Links Technorati Profile TMCnet.com ARCHIVES 09/01/2003 - 10/01/2003 03/01/2004 - 04/01/2004 04/01/2004 - 05/01/2004 05/01/2004 - 06/01/2004 06/01/2004 - 07/01/2004 07/01/2004 - 08/01/2004 08/01/2004 - 09/01/2004 09/01/2004 - 10/01/2004 10/01/2004 - 11/01/2004 11/01/2004 - 12/01/2004 12/01/2004 - 01/01/2005 01/01/2005 - 02/01/2005 02/01/2005 - 03/01/2005 03/01/2005 - 04/01/2005 04/01/2005 - 05/01/2005 05/01/2005 - 06/01/2005 06/01/2005 - 07/01/2005 07/01/2005 - 08/01/2005 08/01/2005 - 09/01/2005 09/01/2005 - 10/01/2005 10/01/2005 - 11/01/2005 11/01/2005 - 12/01/2005 12/01/2005 - 01/01/2006 01/01/2006 - 02/01/2006 02/01/2006 - 03/01/2006 03/01/2006 - 04/01/2006 04/01/2006 - 05/01/2006 05/01/2006 - 06/01/2006 06/01/2006 - 07/01/2006 07/01/2006 - 08/01/2006 08/01/2006 - 09/01/2006 09/01/2006 - 10/01/2006 10/01/2006 - 11/01/2006 11/01/2006 - 12/01/2006 12/01/2006 - 01/01/2007 01/01/2007 - 02/01/2007 02/01/2007 - 03/01/2007 03/01/2007 - 04/01/2007 04/01/2007 - 05/01/2007 05/01/2007 - 06/01/2007 06/01/2007 - 07/01/2007 07/01/2007 - 08/01/2007 08/01/2007 - 09/01/2007 09/01/2007 - 10/01/2007 10/01/2007 - 11/01/2007 11/01/2007 - 12/01/2007 12/01/2007 - 01/01/2008 01/01/2008 - 02/01/2008 02/01/2008 - 03/01/2008 03/01/2008 - 04/01/2008 04/01/2008 - 05/01/2008 05/01/2008 - 06/01/2008

هاشمیان.com

 Home

 Blog

 Web Tools
Usage

 News

 Articles

 FAQ

 About

 Contact

 Financial Markets Book
Read Complete Book

BOOK
Great Speeches by African Americans: Frederick Douglass, Sojourner Truth, Dr. Martin Luther King, Jr., Barack Obama, and Others (Thrift Edition)
James Daley
$3.50

BOOK
Big Book of Apple Hacks: Tips & Tools for unlocking the power of your Apple devices (Hacks)
Chris Seibold
$34.99

BOOK
Mac OS X Leopard Pocket Guide (Pocket Reference)
Chuck Toporek
$14.99

BOOK
Lives of a Cell: Notes of a Biology Watcher
Lewis Thomas
$13.00

BOOK
The Wisdom of the Native Americans
$17.95

|ip-address-and-host-name-scripts|

more…