business.americanexpress IN NS dns1.cscdns.net business.americanexpress IN NS dns2.cscdns.net nic.americanexpress IN A 148.173.91.85 nic.americanexpress IN NS a.nic.americanexpress nic.americanexpress IN NS b.nic.americanexpress nic.americanexpress IN NS c.nic.americanexpress nic.americanexpress IN NS ns1.dns.nic.americanexpress nic.americanexpress IN NS ns2.dns.nic.americanexpress nic.americanexpress IN NS ns3.dns.nic.americanexpress online.americanexpress IN NS dns1.cscdns.net online.americanexpress IN NS dns2.cscdns.net travel.americanexpress IN NS dns1.cscdns.net travel.americanexpress IN NS dns2.cscdns.net