Speed — 100.100

In reality, there is no such thing as a 100.100 Mbps connection. The industry standards are rigid: 10 Mbps, 100 Mbps (Fast Ethernet), 1000 Mbps (Gigabit), 2.5 Gbps, 5 Gbps, and 10 Gbps.

is a software artifact. It usually appears when a system attempts to negotiate a Full Duplex 100 Mbps connection but fails to properly parse the integer. In many legacy operating systems and cheap router firmware, the "100" for speed and the "1" (for Full Duplex) combine awkwardly, or a buffer overflow causes the integer to display the same value twice. The Duplex Theory The most common technical explanation is a concatenation error. A true Fast Ethernet connection is 100 Mbps/Full . If the software rendering the speed uses a template like Speed.Duplex but pulls the value from the wrong register, it might print the Link Speed (100) for both fields, hence 100.100 . The IP Address Confusion There is a second, legitimate occurrence of "100.100" that is not a speed at all. The 100.100.0.0/22 IP range is reserved for specific VPN protocols (like WireGuard or legacy Cisco VPNs). Occasionally, a misconfigured speed testing tool will attempt to resolve a hostname to 100.100.x.x and mislabel the latency as "Speed 100.100." If you see this, you are looking at an IP address, not bandwidth. The History: Why 100 Mbps Refuses to Die To understand Speed 100.100 , you have to respect its parent: 100BASE-TX . Introduced in 1995, Fast Ethernet was the rocket fuel of the dial-up era. It was the standard that made streaming music and LAN parties possible. Speed 100.100

Is it a glitch? A secret ultra-fast protocol? Or simply a typo on a speed test? In reality, there is no such thing as a 100