Is there any other options to fetch the rs-ids for the markers for the Illumina custom array?

Question

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Hi,

I would like to get rs-ids for the markers in the Illumina custom arrays used for iScan platform. Some of the markers have already annotated with rs-ids. But most of them are not. The list is very big, so I cannot manually check them one by one in dbsnp.

Is there any other options for me to fetch the rs-ids for the markers for the custom array?