Description
Multiply fragmentOffset in 0-8191 by eight to obtain the byte offset within the original payload.
A wire-format length may count headers, payload, padding, or only part of an enclosing message. Offsets and exclusive ends must use a clearly stated byte convention.
Multiply fragmentOffset in 0-8191 by eight to obtain the byte offset within the original payload.
When to use this tool
Use Network: IPv4 Fragment Offset Byte Position when you need a field-level byte count or boundary check.
How to use the tool and how it works
- Enter fragmentOffset. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Multiply fragmentOffset in 0-8191 by eight to obtain the byte offset within the original payload.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| fragmentOffset | Fragment Offset | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Result | Required. Object. |
| result.payloadByteOffset | Payload Byte Offset | Calculated result member: number. |
{
"input": {
"fragmentOffset": 10
},
"output": {
"result": {
"payloadByteOffset": 80
}
}
}Limitations and assumptions
- This is a position, not a total datagram length or a reassembly result.
- Outputs are nested inside result. Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Compare the computed span with the actual captured buffer and validate its contents separately.
References
Similar or alternative tools
- IPv4 Fragment Last Payload Boundary
Add offsetUnits × 8 to payloadBytes and reject an exclusive end beyond 65515.
- Network: IPv4 Header Flags Df Mf Pair
Decode the three-bit flags field into reservedSet, dontFragment, and moreFragments.