Geno2Pheno coreceptor is one of the well known method used. You can find it in the following link....

http://coreceptor.bioinf.mpi-inf.mpg.de/

Hi Ravi

In addition to geno2pheno use prediction algorithems from LosAlamos HIV databse.

Thank you Sandeep and Viswanath. Yes, i geno2pheno is most commonly used genotypic software, besides it there are few more e.g wetcat, WebPSSM, Automate etc.

Links:

http://indra.mullins.microbiol.washington.edu/webpssm/

http://genomiac2.ucsd.edu:8080/wetcat/v3.html

http://genome.ulaval.ca/hiv-dskernel/

http://proteins.gmu.edu/automute/AUTO-MUTE_HIV-1_Co-receptor_Usage.html

Oh, it is interesting question and programs.