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IPv6 I read somewhere that we can use the first and last ip address as host addresses in ipv6. Is it true?

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Yes. IPv6 doesn't have broadcast, and all network addresses can be used by hosts.

There are a couple of caveats. There are some well-known anycast addresses. For example, the first IPv6 address in a network should be used for the router anycast address ("It is recommended to avoid allocating this IPv6 address to a device that expects to have a normal unicast address."), and the last 128 addresses in a network are subnet anycast addresses, but only one of those (Mobile IPv6 Home-Agents) has been defined. See RFC 5375, IPv6 Unicast Address Assignment Considerations.

In any case, you should use /64 networks for everything but loopbacks (/128) and point-to-point networks (/127), and that will give you 18,446,744,073,709,551,616 addresses per network.

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