I'm trying to extract information of rs2710126 using plink, but it says such SNP ID doesn't exist in my b files. Is there any way I can find other probe ID for rs2710126, or should I use proxy SNP?

Thank you.

This site is meant to help people with questions about Bioconductor packages. Plink is not a Bioconductor package, or even an R package. You might try over on biostars.org instead.