nextfreeip

Find the next IP address that is not listed in DNS when given a CIDR address

Usage

C:\> nextfreeip 192.168.1.0/26

192.168.1.0      SKIPPED - Network Boundary
192.168.1.1      device1.example.com.
192.168.1.2      device2.example.com.
192.168.1.3      device3.example.com.
192.168.1.4      device4.example.com.
192.168.1.5      device5.example.com.
192.168.1.6 is not in DNS

Notes

• The program stops checking after x.y.z.255 because it assumes a /24 netmask when unspecified.

Download

• Binaries for Windows, macOS and Linux can be found on the releases page.