🌐 Network & IP Tools
Free Online Network & IP Tools Tools
Calculate subnets and CIDR ranges, look up DNS records, generate SSH key pairs, and create random MAC addresses for network engineering tasks.
Random MAC Generator
Generate random MAC addresses
SSH Key Generator
Generate SSH public/private key pairs
Subnet Calculator
Calculate subnet masks, network ranges, and hosts
CIDR Calculator
Calculate CIDR notation ranges and subnets
DNS Lookup
Look up DNS records for any domain
Frequently Asked Questions
What is a subnet mask?
A subnet mask divides an IP address into network and host portions. /24 (255.255.255.0) gives 256 addresses with 254 usable hosts. Use our Subnet Calculator to compute network address, broadcast address, usable range, and number of hosts.
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation expresses IP ranges as address/prefix-length (e.g., 192.168.1.0/24). The prefix length indicates how many bits are the network part. /24 = 256 addresses, /16 = 65,536 addresses, /8 = 16,777,216 addresses.
How do I generate an SSH key pair?
Use our SSH Key Generator to create RSA (2048/4096-bit) or Ed25519 key pairs in your browser. Download the private key and add the public key to ~/.ssh/authorized_keys on your server, or paste it into GitHub/GitLab settings.
What is a MAC address?
A MAC (Media Access Control) address is a hardware identifier assigned to a network interface card. It's 6 bytes (48 bits) in hex (e.g., 00:1B:44:11:3A:B7). The first 3 bytes identify the manufacturer (OUI); the last 3 are device-specific.