ip add

[sham_chennala]

Hi,

May i know the submask used for Class D &class E range of ip add..and also why we are using 127.0.0.0 as loopback add ?

Regards

Sham.

[Jon Marshall]

Hi Sham

Class D (multicast) and class E (reserved) do not have subnet masks. Class D multicast addresses are flat in that they do not have a network and host portion defined by a subnet mask. Please see attached link for more details

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml

127.0.0.1 is convention and it is recognised as the loopback across all Operating systems.

Jon