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IPv4 Subnet & CIDR Calculator

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Calculate network address, broadcast, usable host IP range, and masks.

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IPv4 CIDR & Subnetting Studio Pro

Target IP Address
CIDR Prefix Mask
Presets:
CIDR Network Block10.0.0.0/24
Subnet Mask255.255.255.0
Usable Hosts254 IPs
Wildcard Mask0.0.0.255
Usable Host Address Range10.0.0.1 - 10.0.0.254
Broadcast Address10.0.0.255
IP ClassificationRFC1918 Private (Class A - 10.0.0.0/8)
32-Bit Binary Octet Alignment
IP:00001010.00000000.00000000.00000001
Mask:11111111.11111111.11111111.00000000

Cloud Security Group & Firewall Rules

Port:
# Linux UFW Firewall
sudo ufw allow from 10.0.0.0/24 to any port 443 proto tcp

# Linux iptables Rule
sudo iptables -A INPUT -p tcp -s 10.0.0.0/24 --dport 443 -j ACCEPT

# Nginx Access Control (HTTP block)
allow 10.0.0.0/24;
deny all;

# AWS VPC Security Group Rule (JSON)
{
  "IpProtocol": "tcp",
  "FromPort": 443,
  "ToPort": 443,
  "CidrIp": "10.0.0.0/24"
}
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