How to Check If Your IP Address Is Blacklisted (and Get Delisted)
Run a free blacklist IP address check across 80+ DNS blocklists in minutes. Learn how to check if your IP is blacklisted and get delisted fast.
computer networks
What Is a Proxy Server? How Proxies Work and When to Use Them
A proxy server sits between your device and the internet. Learn how proxies work, their types, and how they differ from VPNs.
What Is Port Forwarding and How Does It Work?
Port forwarding maps internet traffic from a public IP and port to a private device. Learn how it works, when to use it, and security trade-offs.
What Is the Difference Between a Router and a Switch?
A router connects networks at Layer 3 using IP addresses. A switch connects devices within a LAN at Layer 2 using MAC addresses. Learn the key differences.
What Is ICMP?
Learn what ICMP is, how it works, and why the Internet Control Message Protocol matters for network diagnostics and troubleshooting.
What Is a Subnet Mask and How Does It Work?
A subnet mask splits an IP address into network and host portions. Learn how it works, how to read one, and why it matters.
What Is a MAC Address? A Guide to Network Hardware IDs
A MAC address is a unique hardware ID assigned to network interfaces. Learn how it works, how it differs from an IP address, and why randomization matters.
What Is Ping? How the Network Diagnostic Utility Works
Ping is a network diagnostic utility that tests host reachability and measures latency using ICMP echo requests and replies.
What Is the Difference Between Public and Private IP Addresses?
Learn how public and private IP addresses differ, how NAT translates between them, and what CGNAT and IPv6 mean for your network.
What Is an IP Address and How Does It Work?
An IP address is a unique network identifier. Learn what an IP address is, how IPv4 and IPv6 differ, and how to find your public IP address instantly.