World Public Route Servers & Looking Glass

Click a flashing icon on the map or use the telnet links below to access a route server. Once connected, you can query the BGP routing table to help isolate network issues you may be facing.

Route servers serve as invaluable tools for network operators and engineers seeking to understand the global routing table without deploying a full BGP-speaking router. By telnetting into a public route server, you gain read-only access to its routing information base, allowing you to examine how specific prefixes are learned and propagated across the internet. This capability is especially useful for troubleshooting reachability problems, verifying whether a particular network announcement is visible upstream, or investigating path selection anomalies. Many route servers are operated by internet exchange points, large service providers, and research networks, making them widely available across different continents and regions for open use by the networking community.

Looking glass sites provide a web-based alternative to traditional telnet-based route servers, offering a more accessible interface for conducting BGP and traceroute queries. These tools allow users to select a remote location and run commands such as ping, traceroute, or BGP table lookups directly from a browser window. This convenience makes looking glasses particularly helpful for engineers who need to quickly check routing information from a specific geographic vantage point without installing additional software. Many looking glass sites also support multiple query types, enabling users to gather comprehensive diagnostic data about network paths, prefix announcements, and latency measurements from diverse points around the world.

Understanding BGP routing tables is fundamental to diagnosing internet connectivity issues, as BGP is the protocol that governs how prefixes are exchanged between autonomous systems. When a network experiences packet loss or unexpected path changes, querying a route server can reveal whether the problem originates within your own network or exists further upstream. Operators commonly use commands to check the origin AS of a prefix, examine the AS path to see which networks a route traverses, or verify whether more specific prefixes are being advertised. These insights help isolate whether routing policies, filtering misconfigurations, or peering disputes are contributing to the issue at hand.

The practice of using public route servers and looking glass tools has become a cornerstone of internet operations and network education. For those learning BGP concepts, these tools offer a safe, hands-on environment to explore real routing data without risking production network configurations. Students and professionals alike can observe how routes change over time, how different geographic locations affect path selection, and how internet exchange points facilitate peering. By providing transparency into the global routing system, these free resources empower the community to maintain a more stable, observable, and collaborative internet infrastructure for everyone.