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whois or nslookup.. for domain availability?
I want to ask which command i need to use, so the result is not cached and i dont cause any inappropriate overload?
whois domainname.com (when No entries found., domain is available)
nslookup -type=ns domainname.com (when cant find nameservers, domain is expired or available)
So my questions what kind of command do you please suggest?
Does these whois providers have any limits above which they ban your IP?
Last edited by postcd; 10-25-2013 at 08:52 PM.
You appear to know the commands already. whois and nslookup will return the information you want, don't they?
Why on earth would you want to do this every 100ms, though? It can take hours for a new domain registration to have any meaning or be visible - the information has to propagate around the Internet - all you'll be doing with this lookup is hike the load on your own ISP's DNS and on whois servers around the world.
Initial question still not answered. Please can anyone share some helpfull info / idea on how to achieve? Thank you
Last edited by postcd; 10-30-2013 at 06:41 PM.
- Join Date
- May 2011
a) settle down, Beavis, you are not paying anybody here for help
b) man usleep
you've got the commands you need, write yourself a script and try it.
Originally Posted by postcd
thx, anyone have an idea how to discover i got banned by whois service or how to rotate thru more whois services?
maybe loading various whois HTTP websites and extracting an output can be also idea to prevent ban
The problem you face is that querying a whois server every 100ms will look to them like a DoS attack. They'll report this kind of activity to your ISP, who will warn you and eventually kick your account.
Also the information you get back wont change all that often. The whois public database might get updated every couple of hours, or possibly even daily. And the information the whois server won't even be up-to-the-second accurate because of this. You won't know for absolute certain that a domain is available until you submit your registration request.
And on top of that the rules have changed recently, and if you register a domain that overlaps a trademark name or a company or other entity that has a valid claim over it, they can appeal your registration and you may end up losing it.
Set up a cron job to run your query using the commands you started this thread with, write a bit of a script to check the data returned, and have the cron job run a couple of times a day.
But hey - if youre doing this to grab a domain that you feel would represent your own product/company/personality well, then you can appeal to the registrar yourself to have the domain transferred from some cybersquatter. Take a look at this page from icann the bit that seems to be of most interest is in section 4.