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Resolved Re: Hostname given IPv4 address

  1. How-to
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  1. Sivaprakash BKR
    Sivaprakash BKR
  2. PowerBuilder
  3. Monday, 10 January 2022 06:23 AM UTC

Hello,

PB 2019 R3

Want to display hostname given an IPv4 address.  Got a list of IPv4 address for which I need to display the corresponding hostname (computername) in an PB application. 

IPv4 address
192.168.1.10
192.168.1.20
10.0.0.200
...

I need to display the hostname for all the above IPv4 address.   Any function available?

Happiness Always
BKR Sivaprakash

 

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Accepted Answer
Sivaprakash BKR
Sivaprakash BKR Accepted Answer Pending Moderation
  1. Monday, 17 January 2022 08:19 AM UTC
  2. PowerBuilder
  3. # Permalink

As Roland has updated his winsock utility, I mark this issue as resolved.

Thanks Roland.

 

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Responses (5)
Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Monday, 10 January 2022 13:38 PM UTC
  2. PowerBuilder
  3. # 1

My Winsock example has a function of_GetIPAddress that returns a string array of IP Addresses for a hostname.

https://www.topwizprogramming.com/freecode_winsock.html

 

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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Monday, 10 January 2022 14:09 PM UTC
Hi Roland,

I think he wants it reversed: get the hostname from an ip4 address.

regards
  1. Helpful
Sivaprakash BKR
  1. Sivaprakash BKR
  2. Wednesday, 12 January 2022 06:04 AM UTC
Roland

Miguel is correct. I tried Winsock utility, as Miguel says the requirement is to be other way.
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René Ullrich
René Ullrich Accepted Answer Pending Moderation
  1. Monday, 10 January 2022 08:05 AM UTC
  2. PowerBuilder
  3. # 2

Maybe Windows API functions GetNameInfoW will help.

But I have no example how to use it. Sorry.

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Roland Smith
  1. Roland Smith
  2. Wednesday, 12 January 2022 19:02 PM UTC
I updated my Winsock example. It now has a function of_GetNameInfo which returns HostName for the given IP Address.

https://www.topwizprogramming.com/freecode_winsock.html

  1. Helpful 6
Miguel Leeuwe
  1. Miguel Leeuwe
  2. Wednesday, 12 January 2022 23:15 PM UTC
Very useful to any of us. Thank you Roland!
  1. Helpful
Sivaprakash BKR
  1. Sivaprakash BKR
  2. Thursday, 13 January 2022 12:43 PM UTC
Thanks Roland, will add into my library list.
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Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Monday, 10 January 2022 08:07 AM UTC
  2. PowerBuilder
  3. # 3

You could use a powershell script like this one:

$ipAddress= "8.8.8.8"
[System.Net.Dns]::GetHostByAddress($ipAddress).Hostname

result: dns.google

or do a

"ping -a 8.8.8.8"

or a

"nslookup host 8.8.8.8"

but all of these are inferior solutions of using some APIs from the winsock libraries. Roland has an example on his topwizprogramming site, but it's embedded in PBNI and the actual calls are in a C++ solution. It goes way over my head.

regards

MiguelL

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Roland Smith
  1. Roland Smith
  2. Monday, 10 January 2022 14:25 PM UTC
I have pure PB code Winsock also which is the one I linked above. I don't know how to do a DNS lookup from API functions. The PB app could use my RunAndWait object to run nslookup and redirect the output to a file. It could then read the file.
  1. Helpful 1
Miguel Leeuwe
  1. Miguel Leeuwe
  2. Monday, 10 January 2022 14:31 PM UTC
Aha! I was looking at the wrong winsock: https://www.topwizprogramming.com/downloads/WinsockPBNI.zip that C++ solution does seem to contain some kind of a getHostName function if I remember well (not sure about the name).
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Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Monday, 10 January 2022 14:47 PM UTC
  2. PowerBuilder
  3. # 4

Is your database server running on the IP address?

If so, depending on which database you are running, you could get the hostname by running some stored procedure or function on the server.

From the client you then query that table.

regards

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