Click on Filters, expand GENE, scroll down to find biotype and choose all the
IG genes. If you're only interested in the primary assembly
(excluding haplotypic regions and patches) also expand the REGION
section and select all chromosomes, scroll down to find X & Y.
Click on Attributes, expand the GENE, choose 'Transcript type',
'Chromosome/scaffold name', 'Gene start(bp)' and 'Gene end (bp)'
Click Results button at top of the page, export results to Excel
(XLS) and sort results by the Chromosome position to group all
together (they are unordered otherwise).