question for addressing
 

Dear all,
I saw a addressing format a.b.c.0/32. I don't understand what it means.
Could any one explain it to me.
First time I post message here. I am sorry if this is a duplicate.
Thank yu very much.

.

Actually the /32 tells you the number of bits of an IP address denotes the network. In your example, it is another method of saying netmask 255.255.255.255.

For example, a class A address:

10.0.0.1 netmask 255.0.0.0 can be also notated as 10.0.0.1/8
(8 bits denote the network or the 10. The rest is the machine address.)

192.168.0.1 netmask 255.255.255.0 is 192.168.0.1/24

This becomes significant when you subnet your IP addresses.

Thank you very much.
I should think a.b.c.0 /32 follows the slash notation (CIDR convention). But it has meanings when subnet mask< 32. In this case a network with 32 bits of subnetmark means no host at all ?
Correct me if i am wrong.

Yes, it is not meaning a host, but the broadcast address.