ns3.hsbc.com has one IP number , which also has a corresponding reverse pointer. ccf.fr, ccf.com, hsbc.fr, bpic.fr, fd-e.net and at least 100 other hosts use this as a nameserver. hsbc.com is a domain controlled by two nameservers at hsbc.com themselves. They are on the same IP network. Incoming mail for hsbc.com is handled by two mailservers at hsbc.co.uk. They are on the same IP network. hsbc.com has one IP number. ns3.hsbc.com is hosted on a server in United Kingdom.