Reverse DNS Lookup
Query public PTR records for an IPv4 address.
TCP Window Throughput
Estimate a window-limited throughput ceiling from window size and RTT.
Processed locally in your browser.
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How to use TCP Window Throughput
- Choose Example to see valid input, or enter your own data.
- Run the tool and review the result. Invalid inputs show a helpful error.
- Copy or download the output, or use Reset to clear the workspace.
Practical example
64
Common question
What should I know before using this tool?
Window bytes divided by RTT. Ignores congestion, packet loss, protocol overhead and parallel connections.
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Bandwidth Delay Product
Estimate bytes in flight from bandwidth and round-trip time.
Common Ports Reference
Look up common service ports and transport protocols.
DNS Change Planner
Plan TTL reduction and a DNS change using explicit timestamps.