Lookup hostname from ip address
This is where the alias case needs to be introduced. Let's check the example below:. So www. For more information on aliases, check here. Of course, the case where an alias has a single IP address is possible, as shown below:. I did not find any example where a hostname resolves to an alias that does not resolve to an IP address, but I think the case might occur. More than multiple IP addresses and aliases, is there some other special cases You could try:.
Where the hostname ipv6. What about dual-stack hostnames:. In this case, the resolution succeeds, but a ping fails with an unknown host error message.
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This might be a case where your scripting fails. All commands will resolve an IP address if host still exist. Here is a slight variation of the ping approach that takes "unknown host" into account by piping through stderr and uses tr to avoid the use of sed regexps:. In case it's important to capture the exit value, then the following will work although less elegant :. To complete Chris Down's answer, and address jfgagne comments about possibly chained aliases, here is a solution that :.
How to Find Your IP Address in Linux
I would have liked to add this as a comment to Andrew McGregor Re: ping. However it wouldn't let me, so I need to add this as another answer. If somebody can move it into a comment, feel free to. This will output a single IPv4 IP, as well as return 1 in the event of failure, while masking stderr output. I am doing this all the time on my Mac which does not have getent. So, I wrote a stupid wrapper for dns. I don't know the easiest way for a bash-script but if you want to resolve a hostname and see if the host is up, use ping! Modules used here are core modules, so should be available everywhere without installing with CPAN.
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Besides above solution, you can translate multiple host name to ip via below script, the only dependency is "ping" command in core Unix:. Home Questions Tags Users Unanswered. How can I resolve a hostname to an IP address in a Bash script? Ask Question. Asked 8 years, 1 month ago. Active 1 month ago. Viewed k times. DhiaTN 7 7 bronze badges.
Eugene Yarmash Eugene Yarmash 5, 10 10 gold badges 33 33 silver badges 47 47 bronze badges. It's the simplest, requires no extra packages and is easier to parse from a Bash script, too. Use the ahosts instead of hosts. Personally I find nothing wrong with the unspecific request returning IPv6.
About IP to Hostname Tool
Your code should be prepared. IPv6 has been out there for more than 20 years now. They can either use simple string matching, or they must know a lot about the network to find the "true" answer. The latter is a minefield, so many 3rd-party programs and systems -- that I have no control over -- use the former. All of these query DNS directly and ignore other means of resolution: host unix. Chris Down Chris Down By default, using dig only works with ipv4, where host gives both ipv4 and ipv6 answers. This might be unexpected.
Getting the hostname by given IP address
You can try host www. Sometimes, host can be timed out and returns nothing. Worth mentioning: host, dig and nslookup seems to directly talk to the servers listed in resolv. Dario Seidl 1, 15 15 silver badges 14 14 bronze badges. Did you mean dnsutils? You're probably right. I have no Arch here to check.
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- How to find IP Address from hostname in Windows Linux and Unix!
Intended to append a comment later mentioning this, but the answer was already upvoted so I supposed I nailed it See the resolveip entry below if you need to resolve something not in DNS e. Be aware that host sometimes returns multi-line output in the case of redirects , you'll want host unix. This answer deserves a serious downvote. Here is how you could use it: resolveip -s unix. Heinzi Heinzi 1 1 gold badge 6 6 silver badges 13 13 bronze badges.
Also consider ahosts , ahostsv4 , ahostsv6 with getent. This is the case on Solaris. On Linux it's spaces, thus the line above works. I hope those remarks were useful. What a great complement to the accepted answer, showing all the edge cases that one might want to deal with in scripting. My version host does not even state "has address" for my boxes.
To avoid the problem with aliases and always get a single IP address ready for use: python -c 'import socket; print socket. I made a bash function to stick in my bashrc from this answer: gist. Gilles 'SO- stop being evil' k gold badges silver badges bronze badges. To resolve something on my home network like myhostname.
May I suggest this also: ping -q -c 1 -t 1 bahface. Simple but usefull: getent ahostsv4 www. The first command returns the resolved IPv4 address The second command returns the resolved IPv6 address The third command will return the owners preferred address what may IPv4 or IPv6 address. Tom Freudenberg Tom Freudenberg 2 2 silver badges 3 3 bronze badges. By far the most simple one. And its avilable by default. Here is a slight variation of the ping approach that takes "unknown host" into account by piping through stderr and uses tr to avoid the use of sed regexps: ping -c1 -t1 -W0 www.
Type cmd into the search bar. A list of matching search results will appear. Right-click Command Prompt and select Run as administrator. A confirmation message will appear. Click Yes. This opens the command prompt. Type ping -a xxx. Method 3.
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