nsa.c1.byte.nl has one IP number , which also has a corresponding reverse pointer. nsa.byte.nl and ns1.byte.nl point to the same IP. Incoming mail for c1.byte.nl is handled by three mailservers at byte.nl. Two of them are on the same IP network. c1.byte.nl has one IP number. nsa.c1.byte.nl is hosted on a server in Netherlands.