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In a domain name, mostly started with prefix 'www'.is it used like a standard? ifnot, let me know, why?
www stands for world wide web. Many web addresses begin with www, because of the long-standing practice of naming Internet hosts (servers) according to the services they provide.
WWW prefix
A FQDN starting with "www." is used, by convention, for the machine hosting the primary website for a domain.
These days, where websites are more important then they were in the early days of the Internet, it is conventional to also run a webserver on the main machine for the domain (i.e. example.com rather than www.example.com) (these are usually the same machine) and redirect from one to the other.
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I've seen some websites uses multiple domain names that pointing to the same website, for example: facebook.com & fb.com, is it bad for SEO or search results or performance, or other?
No it's not a bad SEO to have multiple domain names pointing to the same website. Many organization use multiple domain names to point to the same website or forward to the same website just to protect their brand name.
But as far as SEO concerned, you have to optimize only one domain name.
If you use multiple domains, you need to use canonical links, otherwise, you may suffer from a penalty. You way also use 301 permanent redirects instead.
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There is Windows Server 2003 machine which has many users to access. Each of them want to configure their own hosts file to redirect a hostname to certain IP address. (They are virtual machines with same hostname and different IP addresses owned by each user.)
C:\WINDOWS\system32\drivers\etc\hosts
Also, we cannot simply ask users to use IP address to connect because the hostname is configured and need to be used in an application. Can we have this user specific hosts file configured or any workaround?
technically this is not possible...a simple programmatic work around could be to write a script and at user logon replace the file with whatever values you want.
since most of the changes in the hosts file are read at runtime, you should be able to achieve the result you are expecting
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Just like the question says. I have deployed a site to AppHarbor, and then I updated the DNS A record for a domain name to point at the IP given on the 'Hostnames' page. The DNS hasn't updated properly yet so can't see if it's worked.
Has anyone else done this and had it work?
It will work with a free account until the 1st of March (although I am not sure if you can add them now). Then you will have to have payment information as it will cost $10 a month.
Another option is to somehow forward the web request to the *.apphb.com address.
I have some free (Canoe) applications there and the DNS worked fine for the hostnames. Although I am not at the point to really need them enough to pay for them, so I removed them and haven't tried re-adding a hostname to see if it will require payment information.
(Information coming from here: http://blog.appharbor.com/2012/02/02/announcing-pricing)
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Is there a service that will identify where a site is hosted (presumably by IP)?
Who-hosts is an online free service that can tell you which is the company that hosts the provided URL, and doesn't require registration.
tracert www.sitename.com
is probably your best bet. The last entry or two should give you your best hint. Otherwise, the whois entry may be a good indicator as well, especially if they are using a hosting provider for DNS.
EDIT:
Its traceroute not tracert on linux machines.
Just do a whois search on the IP.
http://samspade.org/whois/ is a free utility for telling you who owns an IP address or domain name. If this is a server farm hosting multiple servers, then it will likely be registered to the hosting company.
This isn't exactly what the question asked for, but you might find it useful to know that Netcraft provides some pretty neat information about the uptime, web-server software, and ISP used to host websites as well.
Domaintools can usually give you some pretty good information, under the "Server Data" and using the "Reverse IP" tool (though you have to pay to get full results from that one).
http://whois.domaintools.com/websitename.com
just put the website name in instead of websitename.com.
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I'm trying to block a website using the hosts file using this tutorial : http://hackspc.com/how-to-block-a-website/
but It doesn't work, the website I'v blocked In this case facebook still shows up, please can anyone help me out here?
link textI could not access the link (blocked in office) but i think this may help you edit your host file
"“WWW” has become the universal standard for the default host. It is just as common to define a site with no host as well. This means that as far as DNS goes www.yahoo.com & yahoo.com are two totally different sites, even though they resolve to the same place. Because of this to effectively block the site, you must also block all hosts. This would usually mean:
127.0.0.1 facebook.com
127.0.0.1 www.facebook.com"
check the link for more details.
Also i you trying to block multiple sites, its better to have a proper software like proxy server or firewalls which can block access to particular sites.
I think Kavitesh Singh made the most important point: Blocking the domain with and without www. this is the most common reason for an entry not working.
Also, not all browsers immediately react to changes in the hosts file. Have you tried re-starting your browser and / or system?