Cidr on ilham.devhttps://ilham.dev/tags/cidr/Recent content in Cidr on ilham.devHugo -- gohugo.ioenSun, 27 Sep 2026 00:00:00 +0700How I turn an IPv4 range into CIDR blockshttps://ilham.dev/posts/how-to-turn-an-ip-range-into-cidr-blocks/Sun, 27 Sep 2026 00:00:00 +0700https://ilham.dev/posts/how-to-turn-an-ip-range-into-cidr-blocks/Many firewalls and cloud tools want CIDR blocks, but humans often receive IP ranges with a start and end address. The IPv4 Range Expander tool helps me inspect the input and output without writing a one-off script first.