TCP Analyzer

Analyze TCP packet headers with detailed breakdown of all fields including ports, flags, sequence numbers, and window size.

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About This Tool

This TCP Analyzer tool allows you to input raw TCP packet data in hexadecimal format and get a comprehensive analysis of the TCP header. The tool parses and displays all TCP header fields including source and destination ports, sequence and acknowledgment numbers, data offset, control flags (URG, ACK, PSH, RST, SYN, FIN), window size, checksum, and urgent pointer. It also provides validation of checksum (when possible), identifies common TCP flag combinations, and offers insights into the packet's purpose in TCP communication. Perfect for network engineers, students, and developers working with TCP/IP protocols.

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How to Use

Enter TCP packet data in hexadecimal format (without spaces or with spaces/colons) in the input field
Select analysis options like checksum verification and flag interpretation
Click the 'Analyze TCP Packet' button to process the data
View detailed results including parsed header fields, flag analysis, and packet statistics
Use the 'Clear' button to reset the form or 'Analyze Another' to start over

Frequently Asked Questions

Find Quick Answers

What format should I use for TCP packet input?

You can input hexadecimal values with or without separators (spaces, colons, or no separators). The tool automatically cleans the input. Only the TCP header portion (minimum 20 bytes) is required for analysis.

Does this tool validate TCP checksums?

Yes, the tool includes optional checksum verification. However, accurate checksum validation requires the full IP pseudo-header including source/destination IP addresses, which you can optionally provide for complete validation.

What TCP flags does the analyzer detect?

The tool detects all standard TCP control flags: URG (Urgent), ACK (Acknowledgment), PSH (Push), RST (Reset), SYN (Synchronize), and FIN (Finish). It also identifies common combinations like SYN-ACK for connection establishment.

Can I analyze multiple packets at once?

Currently, the tool analyzes one TCP packet at a time. For multiple packets, analyze each separately by clearing the form between analyses.

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