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, Feb 19 '18 at 16:00

score 9 · Accepted Answer · edited Sep 27 '21 at 05:14

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 '21 at 05:14

pstanton

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answered Feb 27 '15 at 09:05

Paco Abato

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Hey thanks paco , now i feel very foolish. By the way how can I know latest questions java. So that I can help others. – forum.test17 Feb 27 '15 at 09:10
Clic the tag Java under your question or better: write `[java]` in the Stack Overlow's search box. – Paco Abato Feb 27 '15 at 09:11
any desktop app regarding this in mac, or some rss feeds, any how thanks for the help – forum.test17 Feb 27 '15 at 09:21
You should [accept](http://meta.stackexchange.com/a/5235/281502) 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](http://stackoverflow.com/help/whats-reputation) for you and the one that answered. – Paco Abato Feb 27 '15 at 10:15
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. – forum.test17 Feb 27 '15 at 13:53

score 3 · Answer 2 · edited Oct 10 '19 at 04:20

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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 '19 at 04:20

Jonny Henly

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answered Feb 27 '15 at 09:05

heikkim

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Thanks for the answer :) stack overflow is faster than asking someone behind your desk – forum.test17 Feb 27 '15 at 09:10

score 0 · Answer 3 · edited May 23 '17 at 12:26

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

try this

edited May 23 '17 at 12:26

Community

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answered Feb 27 '15 at 09:09

Amaresh Pattanayak

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I think this doesn't really answer the question. better just leave it as a comment – Baby Feb 27 '15 at 09:14

Converting mac address to integer resulting in number format exception

3 Answers3