Ip address to domain name lookup

In my particular case I think the problem was a change to resolv.


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In short, if you change resolv. Some of them URLs were invalid the structure of it was ok but the DNS hosts couldn't resolve them and I kept getting an annoying warning. Instead use this function to try to resolve a host.

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This won't throw any warnings, you just need to check the output. You'll get the same warnings with fopen and fsockopen. On another note, it can be a pain when iterating with while loops for example that on failure gethostbyname returns the hostname, rather than FALSE.


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Usig the dot at the end of the host to not perform domain searches. Always add the root.

DNS Lookup Explained

I also find this function a litle bit limited because it doesn't tell you if the resolve failed. If somebody notices a speed-up after the second lookup of the same domain - that's most likely your dns-cache itself, not some php-internal dns-cache. This is the best method I've come up with to resolve any host-name to ip-address, it's quick and reliable and has support for timeout!


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It works only with unix though. Just a heads up. I was using this function on my site to verify email host addresses. I thought all was good, until a potential client contacted me and said they couldn't sign up correctly.

How to display Domain Name instead of IP Address ( Worspress ) - Digital Ocean - AWS

It is also used to troubleshoot DNS related problems. It will output the name serves which are associated with the given domain.

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You can find all TXT records configured for any domain using below command. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. Find mail servers for a domain.

These are probably the most common usage scenarios. You may notice that you get non authoritative answers. You can find out which name servers are responsible authoritative for a domain by setting the query type to NS and entering the domain name as shown below: Common Questions Q- Can I use dig instead of Nslookup?

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Reverse DNS Lookup

Summary Nslookup is a very handy tool for troubleshooting DNS related network problems. Please rate? And use Comments to let me know more.

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Yes you will need to do it yourself as far as I know rgds Steve. Pingback: Computer not finding server through name just IP Address.