Networking Tools
Linux networking utilities for subnetting, DNS, ports, SSH, firewall rules and connectivity troubleshooting.
Choose a tool
Each utility runs in your browser and is designed to produce commands or configuration you can review before using. Start with the task you need, then follow the related-tool links for the next step in the workflow.
IPv4 / IPv6 Subnet Calculator
Enter CIDR notation and calculate the network locally.
NetworkingLinux Port Detective
Look up a port and generate commands to inspect it on Linux.
NetworkingDNS Command Builder
Generate dig, host, and nslookup commands for common DNS lookups.
NetworkingLinux Firewall Generator
Select common services and generate UFW, nftables, or iptables rules.
NetworkingSSH Command Builder
Build secure SSH, SCP, SFTP, and port-forwarding commands without memorizing every option.
NetworkingTelnet Command Builder
Generate Telnet and safer TCP connectivity-test commands for hosts and ports.
NetworkingLinux Network Troubleshooter
Choose a network problem and generate a logical, read-only diagnostic sequence you can run from top to bottom.
NetworkingRemote Control Command Builder
Build common commands for administering Linux hosts you are authorized to manage.
NetworkingPopular networking tools
Common starting points for this category.