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CIDR Notation Converter
CIDR to ranges, overlap detection across many networks, and IP ranges back to CIDR blocks.
Single CIDR
Multiple CIDRs
Range to CIDR
input
IP Address
Enter an IPv4 address for CIDR conversion, for example 192.168.1.0
CIDR Prefix
Enter CIDR prefix from 0 to 32, for example 24
presets
/8
/16
/24
/25
/26
/27
/28
/29
/30
/31
/32
Convert CIDR
Clear saved data
Enter CIDRs (one per line)
Enter one CIDR notation per line. Supports CIDR, subnet mask, wildcard mask, and ACL formats
Analyze CIDRs & Detect Overlaps
Start IP Address
Enter the first IP address in the range, for example 192.168.1.0
End IP Address
Enter the last IP address in the range, for example 192.168.1.255
Convert to CIDR