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TCP/IP with PHP

function gethostbyaddr("1.2.3.4") returns the name of the computer at IP address 1.2.3.4. If the computer has no name, it returns the IP address unchanged. What the function returns when given an invalid IP address is not documented. On this server, it returns nothing. Some real live examples:

The computer at 216.92.35.29 is =>computergripes.com<=
The computer at 64.82.91.124 is =>create-your-healthy-home.com<=

 Viewed 19124 times since July 17,2007 (63 per day over 304.7 days) Home => PHP Projects  
Page: www.michaelhorowitz.com Last Updated: November 8, 2007 10 AM  
Prior to you, the last person to look at this web page did so on Friday, May 16, 2008 11:18:36 PM
Current time on the server is Friday, May 16, 2008 11:18:53 PM
There have been 99377 page views of these PHP pages since February 10, 2004 for an average of 64 per day over 1,557.1 days
The last 5 people to view this web site were from these IP addresses:
38.103.63.17no name found
74.6.8.95llf520030.crawl.yahoo.net
80.237.209.89robot.acoon.de
65.55.213.109livebot-65-55-213-109.search.live.com
74.6.22.241lj511933.crawl.yahoo.net