SG TCP/IP Analyzer
IP Address: 18.97.14.82 (18-97-14-82.crawl.commoncrawl.org)
Client OS: Search Bot
Browser:
User Agent: CCBot/2.0 (https://commoncrawl.org/faq/)
Please Read the Analyzer FAQ if the above
is not your IP address.
TCP options string = 020405b40103030801010402
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MTU = 1500
MTU is fully optimized for broadband.
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MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
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Default TCP Receive Window (RWIN) = 131328
RWIN Scaling (RFC1323) = 8 bits
(scale factor: 2^8=256)
Unscaled TCP Receive Window = 513
RWIN is not multiple of MSS. If your OS supports setting RWIN directly, consider changing it to a multiple of MSS for optimum performance.
Other RWIN values that might work well with your current MTU/MSS:
64240 (up to 2 Mbit lines, depending on latency. MSS * 44)
128480 (1-5 Mbit lines, depending on latency. MSS * 44 * 2)
256960 (2-20 Mbit lines, depending on latency. MSS * 44 * 2^2)
513920 (20-100 Mbit lines, depending on latency. MSS * 44 * 2^3)
1027840 (80+ Mbit lines up to Gigabit connections, depending on latency. MSS * 44 * 2^4)
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bandwidth * delay product (Note this is not a speed test):
Your current TCP Window limits you to: 525 Mbps (~53 Megabytes/s) @ 200ms latency
Your current TCP Window limits you to: 210 Mbps (~21 Megabytes/s) @ 500ms latency
Note: You can expect up to ~90% of this throughput considering line overhead.
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MTU Discovery (RFC1191) = ON
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Time to live left = 113 hops
TTL value is ok.
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| Timestamps (RFC1323) = OFF |
Selective Acknowledgements (RFC2018) = ON
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IP type of service field (RFC1349) = 00000000 (0)
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Share Your Results
Below is a compact version of the results without specific recommendations, useful for sharing your current settings. Feel free
to post in our forums with any questions you may have.
Optimize Your Connection
The TCP/IP Analyzer results provide packet header information from the TCP 3-way handshake between your computer and our server.
The information above can be used to fine-tune TCP/IP settings and optimize your internet connection.
Detailed information on optimizing your network-related settings is available in our Broadband articles and TCP/IP Tweaks Articles.
We have also developed the free TCP Optimizer program to help apply the optimal settings automatically: SG TCP/IP Optimizer
Feel free to ask specific questions about your results in our forums.
96,966,231 connections tested since 2001.03.10
Analyzer version: 1.38 - last updated 2025.08.25
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