Yeah i see that on a few sites too... quite surprisingly many of these sites do not have MNTL blocked (the irony?). While you can't really blame airtel only, some sites just block many countries from Asia. So not much airtel can do about this, it is that peculiar sites webmasters wish to block any IP blocks he likes.
True the webmasters do ban our airtel IPs but this is different. These ips have been banned for spamming by anti-spamming websites which is what concerns me.Why are we being allotted infected ips which had been used to launch spam/bot attacks?