Check for IP validity

Question

How do I check the validity of an IP address in a shell script, that is within the range 0.0.0.0 to 255.255.255.255?

Answer 1

How about this?

# ip route get 10.10.10.100 > /dev/null 2>&1  ; echo $?
0

# ip route get 10.10.10.300 > /dev/null 2>&1  ; echo $?
1

Since the "ip" command checks the validity of IP in itself.