TCP Protocol Visualizer

Transmission Control Protocol (TCP) is a connection-oriented transport layer protocol that ensures reliable, ordered data delivery. Explore TCP headers, sequence numbers, acknowledgments, flags, and flow control mechanisms.

Specification: RFC 793
Protocol:
Try these examples to get started:

Ready to Parse TCP

Select an example above or enter your own hex data to get started

Choose an Example
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Or Paste Your Own
Paste hex packet data directly into the input field
Click Parse
Hit the Parse button to see the field breakdown
Learn TCP FormatView Example Page

AI interpretation

Parsed by ByteLens

Use the current parsed packet as trusted context, then ask AI for interpretation.

Byte Grid

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Parsed Fields

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Protocol Configuration

About TCP Protocol

Transmission Control Protocol (TCP) is a connection-oriented transport layer protocol that ensures reliable, ordered data delivery. Explore TCP headers, sequence numbers, acknowledgments, flags, and flow control mechanisms.

Protocol Fields

  • Source Port: Source port number
  • Destination Port: Destination port number
  • Sequence Number: Sequence number of the first data byte in this segment
  • Acknowledgment Number: Next sequence number the sender expects to receive
  • Data Offset: Size of TCP header in 32-bit words (minimum 5, maximum 15)
  • Reserved: Reserved for future use (must be zero)
  • Flags: Control flags (NS, CWR, ECE, URG, ACK, PSH, RST, SYN, FIN)
  • Window Size: Size of the receive window (flow control)
  • Checksum: Checksum for error detection
  • Urgent Pointer: Offset from sequence number indicating last urgent data byte

How to Use This Tool

  1. Enter hexadecimal packet data in the input field above
  2. Click "Parse" to visualize the TCP packet structure
  3. Hover over bytes in the grid to see field mappings
  4. Review parsed fields in the detailed breakdown panel
  5. Export data in JSON, CSV, or binary format if needed