473,378 Members | 1,152 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,378 software developers and data experts.

GetHostByAddress

I wrote a method which takes an ip address and returns hostname as shown below.
It works fine.. only problem i have is when the passed ip address is not
found in the database the method throws this error message :
The requested name is valid and was found in the database, but it does not
have the correct associated data being resolved for

How can i prevent this error message and instead return "-" ?

Many Thanks.

public string IPToHostname(string IPAddress)
{
IPHostEntry HostInfo = Dns.GetHostByAddress(IPAddress);
if(HostInfo.HostName.ToString()!="")
{
string[] arrHostname = HostInfo.HostName.Split('.');
return arrHostname[0].ToLower();
}
else
{
return "-";
}
}
Jul 21 '05 #1
1 2558
If it is throwing a exception you can catch the exception and return '-'. If
your 'if' condition return statement returns this message may be you should
add additional if condition to check the length of return message or some
thing like that

"huzz" wrote:
I wrote a method which takes an ip address and returns hostname as shown below.
It works fine.. only problem i have is when the passed ip address is not
found in the database the method throws this error message :
The requested name is valid and was found in the database, but it does not
have the correct associated data being resolved for

How can i prevent this error message and instead return "-" ?

Many Thanks.

public string IPToHostname(string IPAddress)
{
IPHostEntry HostInfo = Dns.GetHostByAddress(IPAddress);
if(HostInfo.HostName.ToString()!="")
{
string[] arrHostname = HostInfo.HostName.Split('.');
return arrHostname[0].ToLower();
}
else
{
return "-";
}
}

Jul 21 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
by: ruggierorizzi | last post by:
Hi everyone, i would like to know if there is a difference between gethostbyaddress method and $_SERVER. furthermore i hve a little problem using ip address resolution. Some ip address...
1
by: Rushikesh Joshi | last post by:
Hi Friends I am having some query. On a server two site hosted 1) magnamags.com 2) stardustindia.com Now when I am resolving the IP address for this both sites. I am getting...
1
by: Amy L. | last post by:
When I make the following call: IPHostEntry hostInfo = Dns.GetHostByAddress( hostIPAddress ) ; If the PTR (i.e. the IP address to name resolution) does not exist my program will start making...
3
by: RZ | last post by:
Hi Folks, I wrote an app to scan our Packet Filter logs for certain IPs. It uses GetHostByAddress(). I used multi-threading to get around the 2 second hang. The remaining problem is that...
5
by: Sven | last post by:
Hi! I have a problem with System.Net.Dns.GetHostByAddress(ls_Request.UserHostAddress()).HostName Usually the call GetHostByAddress returns the correct hostname of the client, but sometimes...
1
by: Jed | last post by:
I have a class for logging information about user activity on a web site, but it suddenly became really slow. I was wondering what factors may have caused the slow down. Initially, I used the...
3
by: Jerome Lavalley, MCSE | last post by:
I have an application that does a reverse lookup using System.net.dns.gethostbyaddress, however I am encountering some problems. If the application resolves the address of another machine it...
1
by: huzz | last post by:
I wrote a method which takes an ip address and returns hostname as shown below. It works fine.. only problem i have is when the passed ip address is not found in the database the method throws this...
3
by: Steve Richter | last post by:
I am using Dns.GetHostByAddress and Dns.Resolve to successfully resolve and IP address to an IPEndPoint. IPEndPoint ep = null; IPAddress ipAddr = IPAddress.Parse(m_sRemoteHost); ep = new...
1
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome former...
0
by: taylorcarr | last post by:
A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: aa123db | last post by:
Variable and constants Use var or let for variables and const fror constants. Var foo ='bar'; Let foo ='bar';const baz ='bar'; Functions function $name$ ($parameters$) { } ...
0
by: ryjfgjl | last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.