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idn Addressed #198, correct decoding should only look at last separator.
.gitignore gitignore update
.travis.yml Cleanup travis.yml
CONTRIBUTORS Changed logic to typeswitch and added comments.
COPYRIGHT Remove all copyright notices
LICENSE Update the copy right for the original GO files Enable CAA parsing
client.go Rename to ReadMsgHeader
client_test.go And of course the test too
clientconfig.go A bunch of golint fixes
clientconfig_test.go Use %v as the format arg for errors
defaults.go Add extra docs for SetQuestion and SetNotify
dns.go Update the value of MaxMsgSize
dns_test.go Enable CAA parsing
dnssec.go Add ToCDNSKEY and ToCDS methods (+bugfix)
dnssec_keygen.go A bunch of golint fixes
dnssec_keyscan.go Use algorithm number to determine private key type.
dnssec_privkey.go A bunch of golint fixes
dnssec_test.go More test clean up
doc.go Add link to web article explaining it further
dyn_test.go Remove all copyright notices
edns.go Changes applied:
edns_test.go Fixup tests
example_test.go DNSSEC algorithm and digest types now uint8
format.go Typo in comment
labels.go extra docs
labels_test.go Revert "Use gofmt to simplify code"
msg.go Address miekg's comments
nsecx.go A bunch of golint fixes
nsecx_test.go More test clean up
parse_test.go Switch setCAA, CAA.String to presentation format, add various encodin…
privaterr.go Move all docs to docs.go
privaterr_test.go Use %v as the format arg for errors
rawmsg.go Remove all copyright notices
scanner.go Remove all copyright notices
server.go Expose the udp/tcp listening socket w/ ListenAndServe()
server_test.go Check that the query ID matches the answer ID.
sig0.go Move all docs to docs.go
sig0_test.go Convert tests from being t.Log(..) then t.Fail() to just t.Error(...) as
singleinflight.go Implement outstanding query detection.
tlsa.go If the Matching Type is 1 or 2 we need to return a hash.
tsig.go Move all docs to docs.go
types.go Rename to ReadMsgHeader
types_test.go Add tests for LOC record String() generation and fix small problems
udp.go Export UDP interfaces
udp_linux.go Remove all copyright notices
udp_other.go Remove all copyright notices
udp_windows.go Export UDP interfaces
update.go Move all docs to docs.go
update_test.go CAA now also be tested in TestDynamicUpdateParsing
xfr.go Fix crash in inIxfr when ReadMsg fails
xfr_test.go Replace t.Logf("%s", var) with t.Log(var)
zgenerate.go $GENERATE: don't crash when printing the result.
zscan.go Fix off-by-one on the maxTok and maxCom check
zscan_rr.go Address miekg's comments

Build Status

Alternative (more granular) approach to a DNS library

Less is more.

Complete and usable DNS library. All widely used Resource Records are supported, including the DNSSEC types. It follows a lean and mean philosophy. If there is stuff you should know as a DNS programmer there isn't a convenience function for it. Server side and client side programming is supported, i.e. you can build servers and resolvers with it.

If you like this, you may also be interested in:


  • KISS;
  • Fast;
  • Small API, if its easy to code in Go, don't make a function for it.


A not-so-up-to-date-list-that-may-be-actually-current:

Send pull request if you want to be listed here.


  • UDP/TCP queries, IPv4 and IPv6;
  • RFC 1035 zone file parsing ($INCLUDE, $ORIGIN, $TTL and $GENERATE (for all record types) are supported;
  • Fast:
    • Reply speed around ~ 80K qps (faster hardware results in more qps);
    • Parsing RRs ~ 100K RR/s, that's 5M records in about 50 seconds;
  • Server side programming (mimicking the net/http package);
  • Client side programming;
  • DNSSEC: signing, validating and key generation for DSA, RSA and ECDSA;
  • EDNS0, NSID;
  • TSIG, SIG(0);
  • DNS name compression;
  • Depends only on the standard library.

Have fun!

Miek Gieben - 2010-2012 -


Building is done with the go tool. If you have setup your GOPATH correctly, the following should work:

go get
go build


A short "how to use the API" is at the beginning of doc.go (this also will show when you call godoc

Example programs can be found in the repository.

Supported RFCs

all of them

  • 103{4,5} - DNS standard
  • 1348 - NSAP record
  • 1982 - Serial Arithmetic
  • 1876 - LOC record
  • 1995 - IXFR
  • 1996 - DNS notify
  • 2136 - DNS Update (dynamic updates)
  • 2181 - RRset definition - there is no RRset type though, just []RR
  • 2537 - RSAMD5 DNS keys
  • 2065 - DNSSEC (updated in later RFCs)
  • 2671 - EDNS record
  • 2782 - SRV record
  • 2845 - TSIG record
  • 2915 - NAPTR record
  • 2929 - DNS IANA Considerations
  • 3110 - RSASHA1 DNS keys
  • 3225 - DO bit (DNSSEC OK)
  • 340{1,2,3} - NAPTR record
  • 3445 - Limiting the scope of (DNS)KEY
  • 3597 - Unknown RRs
  • 4025 - IPSECKEY
  • 403{3,4,5} - DNSSEC + validation functions
  • 4255 - SSHFP record
  • 4343 - Case insensitivity
  • 4408 - SPF record
  • 4509 - SHA256 Hash in DS
  • 4592 - Wildcards in the DNS
  • 4635 - HMAC SHA TSIG
  • 4701 - DHCID
  • 4892 - id.server
  • 5001 - NSID
  • 5155 - NSEC3 record
  • 5205 - HIP record
  • 5702 - SHA2 in the DNS
  • 5936 - AXFR
  • 5966 - TCP implementation recommendations
  • 6605 - ECDSA
  • 6725 - IANA Registry Update
  • 6742 - ILNP DNS
  • 6844 - CAA record
  • 6891 - EDNS0 update
  • 6895 - DNS IANA considerations
  • 6975 - Algorithm Understanding in DNSSEC
  • 7043 - EUI48/EUI64 records
  • 7314 - DNS (EDNS) EXPIRE Option
  • xxxx - URI record (draft)
  • xxxx - EDNS0 DNS Update Lease (draft)

Loosely based upon

  • ldns
  • NSD
  • Net::DNS


  • privatekey.Precompute() when signing?
  • Last remaining RRs: APL, ATMA, A6 and NXT and IPSECKEY;
  • Missing in parsing: ISDN, UNSPEC, ATMA;
  • NSEC(3) cover/match/closest enclose;
  • Replies with TC bit are not parsed to the end;
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