Find machine name from ip address

Here is a simple function I compiled from user-notes that works great.. This function seems to be very slow on IIS 4. HostnameLookups On. I just spent a dickens of a time trying to figure out why my gethostbyaddr's were simply failing halfway through.


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On each report page, I'm pulling lines from my Db, but only maybe 25 IPs on average. Sometimes this report would generate in under 15 seconds, other times it would fail with a connection reset. It turns out that several of the IPs in my Db looked like this: x.

DNS Servers and IP Addresses - How Domain Name Servers Work | HowStuffWorks

For my case, I purged the Db and prevented the logging of IPs that contain For ad-rotator. Here is a fail-safe alternative, 1 sec max for timeout per IP. Just to fun that gethostbyadd returns server machine name known in LAN rather then its DNS if I try to call it against my own host from workstation , whether it would local behind the proxy or global of proxy itself IP or just loop Fun :. To convert an IP to a numeric value, just use the ip2long Vice versa; use: long2ip Be careful with the usage of this function - it will slow down a server to a crawl if called a lot and the slowness won't be reflected in any of the obvious places, like CPU usage, apache requests, SQL etc.

When you do use it make a special note of where!

How to Scan for Any Device IP Address on a Network With Tools

If you use gethostbyaddr with a bad IP address then it will send an error message to the error log. In my case It says 'Server: Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

gethostbyname

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How to Find Someone Computer's name

As the four spaces only seem to exist for the Name: entry, this appears to be only way to make it work on other localized systems. JimNim 2, 8 8 silver badges 23 23 bronze badges. Sahin Sahin 1. Keep in mind that the configured hostname not necessarily matches the hostname that is configured in DNS.

Full Network Discovery

Didn't you notice this answer was already here? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Looking to understand which API is best for a certain task?

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