In Qlik GeoAnalytics, Northern Ireland or UK zip codes are not completely shown. As for an example as below:
GU159NZ, only GU159 is displayed. If you look at this more closely, the initial two digits indicate "Area", next two digitis indicate "District", a single digit after this indicates "Sector" and last two digits provides us a "Unit" name.
We do not have "Unit" name included in existing Northern Ireland or UK zip codes at present and this working as designed.
Link to a brief guide to UK postcodes,
https://www.bph-postcodes.co.uk/guidetopc.cgi
Environment:
Qlik GeoAnalytics