Message Rcodes
A DNS Rcode describes the result of a DNS request. If EDNS is not in use, then the rcode is encoded solely in the DNS header. If EDNS is in use, then the rcode is encoded using bits form both the header and the EDNS OPT RR.
- class dns.rcode.Rcode(value)[source]
- BADALG = 21
Algorithm not supported.
- BADCOOKIE = 23
Bad/missing Server Cookie
- BADKEY = 17
Key not recognized.
- BADMODE = 19
Bad TKEY Mode.
- BADNAME = 20
Duplicate key name.
- BADSIG = 16
TSIG Signature Failure
- BADTIME = 18
Signature out of time window.
- BADTRUNC = 22
Bad Truncation
- BADVERS = 16
Bad EDNS version.
- DSOTYPENI = 11
DSO-TYPE Not Implemented
- FORMERR = 1
Format error
- NOERROR = 0
No error
- NOTAUTH = 9
Not authoritative.
- NOTIMP = 4
Not implemented
- NOTZONE = 10
Name not in zone.
- NXDOMAIN = 3
Name does not exist (“Name Error” in RFC 1025 terminology).
- NXRRSET = 8
RRset does not exist.
- REFUSED = 5
Refused
- SERVFAIL = 2
Server failure
- YXDOMAIN = 6
Name exists.
- YXRRSET = 7
RRset exists.
- dns.rcode.NOERROR = Rcode.NOERROR
- dns.rcode.FORMERR = Rcode.FORMERR
- dns.rcode.SERVFAIL = Rcode.SERVFAIL
- dns.rcode.NXDOMAIN = Rcode.NXDOMAIN
- dns.rcode.NOTIMP = Rcode.NOTIMP
- dns.rcode.REFUSED = Rcode.REFUSED
- dns.rcode.YXDOMAIN = Rcode.YXDOMAIN
- dns.rcode.YXRRSET = Rcode.YXRRSET
- dns.rcode.NXRRSET = Rcode.NXRRSET
- dns.rcode.NOTAUTH = Rcode.NOTAUTH
- dns.rcode.NOTZONE = Rcode.NOTZONE
- dns.rcode.BADVERS = Rcode.BADVERS
- dns.rcode.from_text(text: str) Rcode[source]
Convert text into an rcode.
- Parameters:
text (str) – The textual rcode or an integer in textual form.
- Raises:
dns.rcode.UnknownRcode – If the rcode mnemonic is unknown.
- Return type:
- dns.rcode.to_text(value: Rcode, tsig: bool = False) str[source]
Convert rcode into text.
- Parameters:
value (
dns.rcode.Rcode) – The rcode.- Raises:
ValueError – If the rcode is < 0 or > 4095.
- Return type: