This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
I understand that there is no guarantee that this will return a proper host name. For some ip addresses, this takes a ridiculously long time to return, often with just the same ip address I put in. Other ip addresses are faster. Meanwhile, netstat from the command line returns all IP addresses instantly.
So I have three questions:
1) InetAddress API says that it uses a "System Configured lookup setting" to resolve the ip address to a host name. what settting would this be?
2) Why do some ip addresses take longer than others?
3) How does netstat get this same information so much faster?
I am loking through the SIGAR code for their netstat implementation and it just uses something similar to what I put above.