IP address $129\mathrm{.}115\mathrm{.}2\mathrm{.}249/24$ and $129\mathrm{.}115\mathrm{.}2\mathrm{.}25/19$ are due to their

in different sub$-$networks, net$-$masks

in different sub$-$networks, IP addresses

in the same sub$-$network, IP addresses

in the same sub$-$network, net$-$masks