Does anyone know any free software for managing IP address space?
I have not used this particular product from solarwinds, but their other products are good, so give it a whirl
personally i think those kind of applications soften your brain. after completing my ccna, a couple of months without making subnetting and hex conversions i found out that i was totally rusty, so i do not recomend for who is trying to achieve more certs. If your current job role is stable enough, go ahead saves the trouble of thinking.