Parsing IP Address in .NET

Question

I have a string that can either represent a host name (myip.noip.org, etc.) or it can represent a true address ("127.0.0.1"). What is the best way to resolve this to a System.Net.IPAddress?

Thanks in advance.

JaredPar · Accepted Answer · 2011-01-12 17:05:20Z

6

Use the Dns.GetHostAddresses method. This will handle both domain names and raw IP address values

IPAddress[] array = DNs.GetHostAddresses(theString);

answered Jan 12, 2011 at 17:05

JaredPar

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SLaks · Accepted Answer · 2011-01-12 17:04:18Z

6

You can call Dns.GetHostEntry on an IP address or a hostname.
It even does reverse lookups for you.

If you don't need reverse lookup, you can call Dns.GetHostAddresses instead.

answered Jan 12, 2011 at 17:04

SLaks

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1 Comment

Justin Over a year ago

Dns.Resolve is now listed as obsolete; looks like Dns.GetHostEntry is the direct replacement.

Oded · Accepted Answer · 2011-01-12 17:18:32Z

1

Use the IPAddress.Parse method for IP addresses.

IPAddress address = IPAddress.Parse("127.0.0.1");

As mentioned by others, to resolve both IP addresses and host names, use Dns.GetHostEntry which:

Resolves a host name or IP address to an IPHostEntry instance.

IPHostEntry holds a collection of IP addresses in its AddressList property.

edited Jan 12, 2011 at 17:18

answered Jan 12, 2011 at 17:03

Oded

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2 Comments

SLaks Over a year ago

No, it won't. Use the Dns class.

JaredPar Over a year ago

OP asked for resolving an IP address or a host name. This only handles ip addresses

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