Networking Tool
UDP Header Decoder
Paste an 8-byte UDP header in hexadecimal format to decode its four 16-bit fields.
Accepted separators: spaces, colons, hyphens, or no separators. Exactly 16 hexadecimal digits are required.
UDP header layout
BytesFieldSize
0–1Source Port16 bits
2–3Destination Port16 bits
4–5UDP Length16 bits
6–7Checksum16 bits
Decoded Result
Enter a UDP header and select Decode Header.
Source Port—
—
Destination Port—
—
UDP Length—
—
Payload Length—
UDP length − 8 bytes
Checksum—
—
Interpretation
Byte Map
How to read a UDP header
UDP uses a fixed 8-byte header. The length field includes both the 8-byte header and the UDP payload. A zero checksum has a special meaning only in IPv4; IPv6 requires a valid UDP checksum except in narrowly defined cases.
Your feedback matters
Was this post helpful?
0
reactions