Answer Posted / karthik

proc next_ipv4 {a} {
regexp {([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)} $a b
set b [split $b .]
if {[lindex $b 3] < 255} {
set c [lindex $b 3]
set c [expr $c +1]
set b [lreplace $b 3 3 $c]
set b [join $b .]
puts "next IP is $b"
} elseif {[lindex $b 2] < 255} {
set c [lindex $b 2]
set c [expr $c +1]
set b [lreplace $b 2 3 $c 1]
set b [join $b .]
puts "Next IP is $b"
} elseif {[lindex $b 1] < 255} {
set c [lindex $b 1]
set c [expr $c +1]
set b [lreplace $b 1 3 $c 0 1]
set b [join $b .]
puts "next IP is $b"
} elseif {[lindex $b 0] < 255} {
set c [lindex $b 0]
set c [expr $c +1]

set b [lreplace $b 0 3 $c 0 0 1]
set b [join $b .]
puts "next IP is $b"
} else {
puts "Last IPv4 address is 255.255.255.255"
}
}

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