Valid ip address ?

In the referenced message, JothirLatha Jaganathan said:

Can any one tell me if the last byte of a point to
point or loopback ipaddress with 32 bit mask can be 0
or 255?

For e.g.:

Is 10.1.1.0/32 a valid interace address?

Yes, it is valid, as is 10.1.1.0/31, for ptp links.