dndns Wiki & Documentation Rss Feed

Updated Wiki: Home

jmonty — Tue, 10 Feb 2009 22:03:26 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile.

This library is also used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Thu, 04 Dec 2008 04:52:19 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile.

This library is also used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Thu, 04 Dec 2008 04:52:01 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile.

This library is also used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.
On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Mon, 24 Nov 2008 18:40:06 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

This library is also used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Tue, 08 Jul 2008 14:11:54 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

This library is used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

UPDATED WIKI: Home

jmonty — Thu, 13 Mar 2008 20:43:03 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

Background Information (my blog)
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

UPDATED WIKI: Home

jmonty — Thu, 13 Mar 2008 20:31:50 GMT

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

For an extensive RFC reference for DNS: check here: http://www.dns.net/dnsrd/rfc/

dndns_pad_file.xml

UPDATED WIKI: Home

jmonty — Fri, 08 Feb 2008 07:35:33 GMT

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

UPDATED WIKI: Home

jmonty — Fri, 08 Feb 2008 07:23:20 GMT

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

dndns_pad_file.xml

UPDATED WIKI: Home

jmonty — Fri, 08 Feb 2008 07:21:18 GMT

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

UPDATED WIKI: Home

jmonty — Fri, 08 Feb 2008 07:20:39 GMT

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

UPDATED WIKI: How to lookup SPF Records

jmonty — Tue, 05 Feb 2008 16:02:00 GMT

How to Lookup SPF Records for a Domain

SPF, or Sender Policy Framework, takes advantage of the DNS TXT record types to store information about the authorized mail servers for your domain.
ref: http://www.openspf.org/

SPF Records are simple TXT Record types within the DNS System.

string dnsServer = "192.168.0.1";
string domainToResolve = "atgi.com";
 
// Use NsType.TXT for SPF lookups
DnsQueryRequest request = new DnsQueryRequest();
DnsQueryResponse response = request.Resolve(dnsServer, domainToResolve, NsType.TXT, NsClass.INET, ProtocolType.Udp);
 
Console.WriteLine("Bytes received: " + response.BytesReceived);
 
// Enumerate the Answer Records
Console.WriteLine("Answers:");
foreach (IDnsRecord record in response.Answers)
{
    Console.WriteLine(record.Answer);
    Console.WriteLine("  |--- RDATA Field Length: " + record.DnsHeader.DataLength);
    Console.WriteLine("  |--- Name: " + record.DnsHeader.Name);
    Console.WriteLine("  |--- NS Class: " + record.DnsHeader.NsClass);
    Console.WriteLine("  |--- NS Type: " + record.DnsHeader.NsType);
    Console.WriteLine("  |--- TTL: " + record.DnsHeader.TimeToLive);
    Console.WriteLine();
}

Output

Bytes received: 88
Answers:
text: v=spf1 ip4:70.61.58.69 mx a:derrida.atgi.com -all
  |--- RDATA Field Length: 50
  |--- Name: atgi.com.
  |--- NS Class: INET
  |--- NS Type: TXT
  |--- TTL: 1800

UPDATED WIKI: How to lookup SPF Records

jmonty — Tue, 05 Feb 2008 16:01:44 GMT

How to Lookup SPF Records for a Domain

SPF, or Sender Policy Framework, takes advantage of the DNS TXT record types to store information about the authorized mail servers for your domain.

ref: http://www.openspf.org/

SPF Records are simple TXT Record types within the DNS System.

string dnsServer = "192.168.0.1";
string domainToResolve = "atgi.com";
 
// Use NsType.TXT for SPF lookups
DnsQueryRequest request = new DnsQueryRequest();
DnsQueryResponse response = request.Resolve(dnsServer, domainToResolve, NsType.TXT, NsClass.INET, ProtocolType.Udp);
 
Console.WriteLine("Bytes received: " + response.BytesReceived);
 
// Enumerate the Answer Records
Console.WriteLine("Answers:");
foreach (IDnsRecord record in response.Answers)
{
    Console.WriteLine(record.Answer);
    Console.WriteLine("  |--- RDATA Field Length: " + record.DnsHeader.DataLength);
    Console.WriteLine("  |--- Name: " + record.DnsHeader.Name);
    Console.WriteLine("  |--- NS Class: " + record.DnsHeader.NsClass);
    Console.WriteLine("  |--- NS Type: " + record.DnsHeader.NsType);
    Console.WriteLine("  |--- TTL: " + record.DnsHeader.TimeToLive);
    Console.WriteLine();
}

Output

Bytes received: 88
Answers:
text: v=spf1 ip4:70.61.58.69 mx a:derrida.atgi.com -all
  |--- RDATA Field Length: 50
  |--- Name: atgi.com.
  |--- NS Class: INET
  |--- NS Type: TXT
  |--- TTL: 1800

UPDATED WIKI: Home

jmonty — Tue, 05 Feb 2008 15:58:45 GMT

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

UPDATED WIKI: Home

jmonty — Tue, 05 Feb 2008 15:13:13 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For some background info see this post on my blog:
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

UPDATED WIKI: Home

jmonty — Tue, 05 Feb 2008 15:10:35 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

Quick HOWTO Reference

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For some background info see this post on my blog:
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

UPDATED WIKI: How to do a reverse name lookup

jmonty — Tue, 05 Feb 2008 15:10:17 GMT

How to do a Reverse Name Lookup (PTR)

A Reverse name lookup takes an IP address and resolves it to a DNS Name. This is called a PTR (pointer) record.

Example Code

string dnsServer = "192.168.0.1";
string domainToResolve = "72.14.253.83";
 
DnsQueryRequest request = new DnsQueryRequest();
DnsQueryResponse response = request.Resolve(dnsServer, domainToResolve, NsType.PTR, NsClass.INET, ProtocolType.Udp);
 
Console.WriteLine("Bytes received: " + response.BytesReceived);
 
// Enumerate the Answer Records
Console.WriteLine("Answers:");
foreach (IDnsRecord record in response.Answers)
{
    Console.WriteLine(record.Answer);
    // Common IDnsRecord Fields
    Console.WriteLine("  |--- RDATA Field Length: " + record.DnsHeader.DataLength);
    Console.WriteLine("  |--- Name: " + record.DnsHeader.Name);
    Console.WriteLine("  |--- NS Class: " + record.DnsHeader.NsClass);
    Console.WriteLine("  |--- NS Type: " + record.DnsHeader.NsType);
    Console.WriteLine("  |--- TTL: " + record.DnsHeader.TimeToLive);
    Console.WriteLine();
}

Output

Bytes received: 77
Answers:
po-in-f83.google.com.
  |--- RDATA Field Length: 22
  |--- Name: 83.253.14.72.in-addr.arpa.
  |--- NS Class: INET
  |--- NS Type: PTR
  |--- TTL: 14800

UPDATED WIKI: How to do a reverse name lookup

jmonty — Tue, 05 Feb 2008 15:10:08 GMT

How to do a Reverse Name Lookup (PTR)

A Reverse name lookup takes an IP address and resolves it to a DNS Name. This is called a PTR (pointer) record.

Example Code

string dnsServer = "192.168.0.1";
string domainToResolve = "72.14.253.83";
 
DnsQueryRequest request = new DnsQueryRequest();
DnsQueryResponse response = request.Resolve(dnsServer, domainToResolve, NsType.PTR, NsClass.INET, ProtocolType.Udp);
 
Console.WriteLine("Bytes received: " + response.BytesReceived);
 
// Enumerate the Answer Records
Console.WriteLine("Answers:");
foreach (IDnsRecord record in response.Answers)
{
    Console.WriteLine(record.Answer);
    // Common IDnsRecord Fields
    Console.WriteLine("  |--- RDATA Field Length: " + record.DnsHeader.DataLength);
    Console.WriteLine("  |--- Name: " + record.DnsHeader.Name);
    Console.WriteLine("  |--- NS Class: " + record.DnsHeader.NsClass);
    Console.WriteLine("  |--- NS Type: " + record.DnsHeader.NsType);
    Console.WriteLine("  |--- TTL: " + record.DnsHeader.TimeToLive);
    Console.WriteLine();
}

Output

Bytes received: 77
Answers:
po-in-f83.google.com.
  |--- RDATA Field Length: 22
  |--- Name: 83.253.14.72.in-addr.arpa.
  |--- NS Class: INET
  |--- NS Type: PTR
  |--- TTL: 14800

UPDATED WIKI: Home

jmonty — Tue, 05 Feb 2008 15:05:09 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

Quick Reference

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For some background info see this post on my blog:
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

UPDATED WIKI: Home

jmonty — Tue, 05 Feb 2008 15:04:22 GMT

Project Description
A DNS protocol library written completely in managed code. Supports common DNS records types like A, CNAME, MX, SRV, and more.

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For some background info see this post on my blog:
http://choosing-a-blog-url-sucks.blogspot.com/2008/02/dndns-net-dns-client-library-resolver.html.

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25