Description
Combine the eight-bit extendedRcode and four-bit headerRcode as 16 × extendedRcode + headerRcode.
Packet headers encode several meanings in fixed-width fields. Bit positions, network byte order, and reserved values must be distinguished from validation of an entire message.
Combine the eight-bit extendedRcode and four-bit headerRcode as 16 × extendedRcode + headerRcode.
When to use this tool
Use Network: DNS Rcode Low High Field Join when you need to decode or encode one explicit packet field.
How to use the tool and how it works
- Enter headerRcode, extendedRcode. 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.
Combine the eight-bit extendedRcode and four-bit headerRcode as 16 × extendedRcode + headerRcode.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| headerRcode | Header Rcode | Required. Safe integer. |
| extendedRcode | Extended Rcode | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Result | Required. Object. |
| result.rcode | Rcode | Calculated result member: number. |
{
"input": {
"headerRcode": 0,
"extendedRcode": 1
},
"output": {
"result": {
"rcode": 16
}
}
}Limitations and assumptions
- This does not locate an OPT record or map the resulting code to a response meaning.
- 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
Inspect the complete captured header and apply the relevant protocol's structural and state rules.
References
Similar or alternative tools
- DNS Header Rcode Low Bits
Return the low four bits of flags as rcode.
- DNS NXDOMAIN NODATA Header Distinction
Classify RCODE 3 as nxdomain; RCODE zero becomes noerror-empty-answer or noerror-answer according to answerCount.