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This module explains the use of the InetAddress class.

Table of contents


This module is one in a collection of modules designed for teaching INEW 2338 Advanced Java (Web) at Austin Community College in Austin, TX. More specifically, it is one in a sub-collection of modules designed forteaching network programming in that course. The purpose of this module is to introduce the student to the InetAddress class that can be used to deal with IP addresses and domain names .

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.


  • Figure 1 . Program output.
  • Figure 2 . The list of Google IP addresses.
  • Figure 3 . The IP Address for my localhost.
  • Figure 4 . Name and IP address of my localhost.
  • Figure 5 . Canonical host name for Google.
  • Figure 6 . Google host name using reverse lookup.


  • Listing 1 . Beginning of the program.
  • Listing 2 . Display the Google InetAddress objects.
  • Listing 3 . Get InetAddress object for localhost.
  • Listing 4 . Extract name and IP address of my localhost.
  • Listing 5 . Get and display canonical host name for Google.
  • Listing 6 . Do a reverse lookup on Google.
  • Listing 7 . End of the program.
  • Listing 8 . Complete program listing.

General background information

Every computer attached to an IP network has a unique 32-bit or 128-bit IP address.

For human consumption, we usually convert each of the bytes in the IP address to an unsigned decimal value and display them connected by periods to make them easier toremember. As of this writing, the IP address of www.austincc.edu (the college where I teach) is

The domain name

What do we mean when we speak of www.austincc.edu ?

Each IP address can have a corresponding name known as a domain name . The domain name for the IP address is www.austincc.edu .

For example, I can enter either the IP address or the domain name into the address field of mybrowser and use it to connect to the ACC web site.

The Domain Name System (DNS)

The Domain Name System (DNS) was developed to translate between IP addresses and domain names. Whenever you log your browser onto the internet andattempt to connect to a server using its domain name , the browser first communicates with a DNS server to learn the corresponding numeric IPaddress. The numeric IP address is encapsulated into the data packets and used by the internet protocol to route those packets from the source to thedestination.

The InetAddress class

We will learn how to use methods of the Java InetAddress class to find the IP address corresponding to a domain name in this module.

We will learn how to find the canonical host name for a given domain name.

We will learn how to obtain information about the localhost .

We will learn how to do a reverse lookup to find the canonical host name associated with an IP address.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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