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Subnetting
IP Address
Subnet Mask (CIDR)
/8 (255.0.0.0)
/9 (255.128.0.0)
/10 (255.192.0.0)
/11 (255.224.0.0)
/12 (255.240.0.0)
/13 (255.248.0.0)
/14 (255.252.0.0)
/15 (255.254.0.0)
/16 (255.255.0.0)
/17 (255.255.128.0)
/18 (255.255.192.0)
/19 (255.255.224.0)
/20 (255.255.240.0)
/21 (255.255.248.0)
/22 (255.255.252.0)
/23 (255.255.254.0)
/24 (255.255.255.0)
/25 (255.255.255.128)
/26 (255.255.255.192)
/27 (255.255.255.224)
/28 (255.255.255.240)
/29 (255.255.255.248)
/30 (255.255.255.252)
/31 (255.255.255.254)
/32 (255.255.255.255)
Advanced Options
Custom Subnet Sizes (comma-separated hosts needed)
Show Binary Calculations
Use Variable Length Subnet Masking (VLSM)
Calculate
