How to expand range with default operator $foo:-10

I am looking for a way to expand this iterator before execution at the moment it sets $i to {0..255} and it should set $i to 0 to start with and iterate. Tried this can you see an example? What about delayed expansion is there something that can expand first before the do command?

for i in {${octet[0]:-0}..255}; do
        for j in {${octet[1]:-0}..255}; do
                for k in {${octet[2]:-0}..255}; do
                        for l in {${octet[3]:-0}..255}; do
                                echo "ntpdate -q $i.$j.$k.$l"
                                output=$(ntpdate -q $i.$j.$k.$l 2>&1)
                                if [[ $? = 0 ]]; then
                                        echo "ntpdate -q $i.$j.$k.$l" >> bashntpdate.log
                                        echo "$output" >> bashntpdate.log
                                        echo "" >> bashntpdate.log
                                        echo "$output"
                                fi
                        done
                done
        done
done

At the moment this outputs:

ntpdate -q {10..255}.{20..255}.{10..255}.{100..255}

This is the reference I work from usually.