Q. What are ISSN numbers?

ISSNs are 8-digit ID numbers identifying serials. They are accepted and assigned both nationally and internationally. The numbers in an ISSN have no meaning unlike an ISBN, in which each part of the 13 digits has a meaning. One journal can have two ISSN numbers: one for its print version, and one for its digital version. 

To apply for an ISSN, go to the US ISSN Center 

To check if an ISSN is real go to the ISSN Portal.