Answer / thiru

set ip "10.255.255.255"
set list [split $ip "."]
set oct1 [lindex $list 0]
set oct2 [lindex $list 1]
set oct3 [lindex $list 2]
set oct4 [lindex $list 3]

if {$oct4>254} {
set oct4 0
set oct3 [expr $oct3+10]
if {$oct3>255} {
set oct3 0
set oct3 [expr $oct3+10]
if {$oct2>255} {
set oct2 0
set oct3 [expr $oct1+10] }
if {$oct1>255} {
set oct1 0
}}} else {
set oct4 [expr $oct4+10]
}
puts "$oct1.$oct2.$oct3.$oct4"

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