The National Science Library in New Delhi serves as India's National Centre for ISSN, having been designated in 1986 to assign ISSNs to serial publications published in India. Over 28 years it has assigned ISSNs to over 18,000 serials. The library maintains records of ISSNs and serials in both print ledgers and an automated online system. It regularly updates ISSN assignment guidelines and the ISSN records available on its website.