A simple IP subnet calculator written in Go.
You provide an IPv4/IPv6 address in CIDR notation (e.g. 192.168.1.42/27, ::2001:db8:1/89), and the program calculates basic network information.
⚠️ Disclaimer: I’m currently learning Go, and this is my first project in this language — so treat it as a learning experiment rather than a production-ready tool. 😊
Given an IP address (usually in IP/MASK CIDR format), it will:
- ✅ Validate the input address
custom validation - ✅ Calculate the network address
- ✅ Calculate the broadcast address
- ✅ Display the subnet mask (CIDR and dotted-decimal)
- ✅ Show the first and last usable host addresses
- ✅ Calculate the total number of hosts in the subnet
- ✅ (Optionally) display the wildcard mask or binary representation
- Go (recommended:
1.20+)
Run directly without building:
go run . 192.168.1.42/27Or build a binary:
go build -o ipcalculator
./ipcalculator 192.168.1.42/27
ipcalculator -ip4 10.1.11.24/14 -ip 8.13.29.11/29 -ip6 2001:db8::/56 -ip6 2001:db::13:31:faf1/34
------ Start
--- Version IPv4
Addr/Pref : 10.1.11.24/14
Address : 10.1.11.24
Mask : 255.252.0.0
Network : 10.0.0.0
Broadcast : 10.3.255.255
Host number : 262142
--- Version IPv4
Addr/Pref : 8.13.29.11/29
Address : 8.13.29.11
Mask : 255.255.255.248
Network : 8.13.29.8
Broadcast : 8.13.29.15
Host number : 6
--- Version IPv6
Addr/Pref : 2001:db8:0:0:0:0:0:0/56
Address : 2001:db8:0:0:0:0:0:0
Mask : 56
Network : 2001:db8:0:0:0:0:0:0/56
Last address : 2001:db8:0:ff:ffff:ffff:ffff:ffff/56
Host number : To many to bother...
--- Version IPv6
Addr/Pref : 2001:db:0:0:0:13:31:faf1/34
Address : 2001:db:0:0:0:13:31:faf1
Mask : 34
Network : 2001:db:0:0:0:0:0:0/34
Last address : 2001:db:3fff:ffff:ffff:ffff:ffff:ffff/34
Host number : To many to bother...
------ End