The ISSN identifies the title of a serial and stays the same from issue to issue unless the title changes, at which point a new ISSN needs to be assigned.

What is an issue number in a journal?

Volumes and issues

Volume typically refers to the number of years the publication has been circulated, and issue refers to how many times that periodical has been published during that year. For example, the April 2011 publication of a monthly magazine first published in 2002 would be listed as, "volume 10, issue 4".

Is issue Same as number in journal?

The difference between the numbers is that "volume typically refers to the number of years the publication has been circulated, and issue refers to how many times that periodical has been published during that year" (Wikipedia, n.d., para.