Converting mac address to integer resulting in number format exception

Question

System.out.println(Integer.parseInt("4B5CE3D77A73",16);

throws me a number format exception. and the mac address is valid one which is generated from this site http://www.miniwebtool.com/mac-address-generator/

Do i miss something here ?

Ethernet and Wireless LAN have 6 byte (48 bit) MAC addresses while int in Java has only 32 bit. — Andre Holzner
– Andre Holzner, Commented Feb 19, 2018 at 16:00

pstanton · Accepted Answer · 2021-09-27 05:14:28Z

9

Looks like the number is greater than what Integer can hold. Try with Long:

Long.parseLong("4B5CE3D77A73",16)

Documentation states that it throws NumberFormatException - if the string does not contain a parsable integer. Not only if the string contains invalid characters but also if the number is greater than Integer.MAX_VALUE.

edited Sep 27, 2021 at 5:14

pstanton

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answered Feb 27, 2015 at 9:05

Paco Abato

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5 Comments

forum.test17 Over a year ago

Hey thanks paco , now i feel very foolish. By the way how can I know latest questions java. So that I can help others.

Paco Abato Over a year ago

Clic the tag Java under your question or better: write [java] in the Stack Overlow's search box.

forum.test17 Over a year ago

any desktop app regarding this in mac, or some rss feeds, any how thanks for the help

Paco Abato Over a year ago

You should accept as a valid answer any of the correct answers. So the question is marked as resolved and could help other people in the future. Also you provide of some reputation for you and the one that answered.

forum.test17 Over a year ago

hey sorry paco, I am new hear, I assumed the clicking on the arrow mark is way of acception the answer @Paco. I have accepted your answer.

Jonny Henly · Accepted Answer · 2019-10-10 04:20:15Z

3

The number does not fit to an integer, which's maximum value is:

System.out.println(Integer.MAX_VALUE); // prints 2147483647

Try the following:

Long.parseLong("4B5CE3D77A73",16); // 0x4B5CE3D77A73 == 82862331624051

edited Oct 10, 2019 at 4:20

Jonny Henly

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answered Feb 27, 2015 at 9:05

heikkim

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1 Comment

forum.test17 Over a year ago

Thanks for the answer :) stack overflow is faster than asking someone behind your desk

Community · Accepted Answer · 2017-05-23 12:26:23Z

0

i think you should convert it to hexa format. this may help you.

try this

edited May 23, 2017 at 12:26

CommunityBot

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answered Feb 27, 2015 at 9:09

Amaresh Pattanayak

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1 Comment

Baby Over a year ago

I think this doesn't really answer the question. better just leave it as a comment

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