CIDR and subnet calculator

IP to CIDR - simple

Input lower and upper IP (either IPv4 or IPv6) of the range - the tool will calculate best matching CIDR range. Subnet will be included in result.



IP to CIDR - advanced

Input at least two IP's (IPv4 and/or IPv6), domainnames or CIDR ranges to include - the tool will calculate best matching CIDR ranges. Subnet will be included in result. Seperate by space, tab, newline or comma.


IPv4 max network prefix:

IPv6 max network prefix:

Reverse - CIDR to IP + subnet

Input one or more CIDR ranges to get info of IP addresses and subnet.


CIDR to IP result

125.244.142.128/26


CIDR
125.244.142.128/26


lower IP
125.244.142.128


upper IP
125.244.142.191


subnet
255.255.255.192


broadcast
125.244.142.191


count
64



byte no: 1 2 3 4
bit no:

 1-8

 9-16

 17-24

 25-32
value: 125 244 142 128
bit pattern:
0
1
1
1
1
1
0
1
1
1
1
1
0
1
0
0
1
0
0
0
1
1
1
0
1
0
0
0
0
0
0
0
prefix:
/26
 

Log

  • Parseing '125.244.142.128/26' into 64 IP's
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